Question about HP Compaq 6715b Notebook

1 Answer

Hp 6715b vga's to external display fine, but no internal display. Replaced display cable, inverter, and lcd is good, I know this as fact ! Still no display, HELP ?

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  • 8 more comments 
  • Ray Mayes Oct 19, 2013

    I have 6 of these with same problem, and I applied the same solution to all 6. I do see very dim text, its possibly backlight, but can this be a coincidence it happened to all 6 ? I've been swapping displays to check for video but same thing ? Thanks. ?

  • Ray Mayes Oct 19, 2013

    I've been pushing FN and then the F4 button to view external, are you saying it may be set to external, but not internal display ? If so, how do I reset to internal ? I'll check ground on cable, and sleep button, Thanks. Thanks.

  • Robert Hamilton
    Robert Hamilton Oct 19, 2013

    Hi Ray, Since that didnt work lets do this. turn on your computer, tapping the F10 key. Not to fast, keep doing this until it enters BIOS.

  • Robert Hamilton
    Robert Hamilton Oct 19, 2013

    Add a CommentUse your arrow keys and go to diagnostics, go to memory and push enter. This will run a memory test. Let me know the results. Having 6 with the same issue sounds like the back light may be the issue. To go out at the same time ??

  • Ray Mayes Oct 19, 2013

    I am grateful Robert, you seem to be well researched in your troubleshooting ! I know for fact memory is ok, already ran mem test ! I tend to agree, I think I may have blown bulbs inadvertantly while swapping LCD's, what do you think ? Thanks.

  • Ray Mayes Oct 19, 2013

    Sleep buttons are ok, cables ok...

  • Robert Hamilton
    Robert Hamilton Oct 19, 2013

    Thank you, Yes that could be the problem. It could be one of the computers has a short somewhere on the board. I would buy a backlight with the wiring harnes attached, remove the face plate from the LCD. Unplug the backlight from the inverter and plug the new one in. Turn the computer on and if the light lights up then you found the problem. Use the same one on each machine. Start with the ones you know worked before trading screens. You can remove the screen bezal without removing the screen. The backlights can be found on sites like amazon, E-bay etc...

  • Ray Mayes Oct 19, 2013

    I'm afraid I've given up a little to early, as this area of replacing bulbs I'm not familiar with,lol...but I'm learning and eager as hell to get-r-done, lol...

  • Ray Mayes Oct 19, 2013

    I'll try the area I'm not familiar with and expand my knowledge base,lol. It would have save me a few bucks had I asked you first though, da...I bought display cables & inverters thinking yea, that'll work, ha ! It did'nt ! Thank You Robert, I think this nails it, I give you 5 stars, your the man...I'll update when I see progress, Thank You.

  • Robert Hamilton
    Robert Hamilton Oct 19, 2013

    Thank you Ray, Good luck.

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  • 50 Answers

Hi, First push your FN- and the F- button that has the display symbol it may be set to the external screen. Can you see anything on the screen if you hold a flashlight close to it? If so I would say your back light went out and will need to be replaced. If this is not the case, recheck your cable and make sure it is grounded properly.
Also check the sleep button, This should be located above the keyboard. Sometimes it gets stuck.
Robert

Posted on Oct 19, 2013

Testimonial: "This expert is very helpful, I'd appreciate further communication for additional trouble shooting ! Thanks."

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Posted on Jan 02, 2017

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SOURCE: Lid switch location??????????

HP DV 5000 LID switch location is here:
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If You want test lid switch, just connect A+B together for a monent!
If the monitor flashes on...? Lid switch is faulty.
It is too dificult to change the lid switch, so the easiest way is connect these pins together forever. :))

Dont forget to turn off your notebook... he wont sleep anymore ;))

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Greetings from Latvia.

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Posted on Jul 21, 2009

yoder42
  • 2 Answers

SOURCE: dvi port doesn't work with 23'' samsung monitor

6710b does not support DVI even though they never said so in the documentation, i'm betting that 6715b does not either. I'm pretty bummed about it. My nc6400 worked great, just switched to the 6710 and my dual monitors would not work, with a little research i found that the DVI on the docking station, simply is not supported. No matter what your monitor configuration is...Ctrl+Alt+Del to you too HP!

Posted on Jul 21, 2009

  • 57 Answers

SOURCE: HP DV1000 screen too dim

The 4 most common problems with dim lcd's on a laptop are boken screens, bad power inverter, bad florescent bulbs or a broken cable.

You can test the power inverter with a meter.

There should be 2 bulbs. If your screen is dim and your inverter is good and you can still make out what is on the screen, you probably have a bad bulb. If you can't determine which bulb is bad you'll have to replace both.

In my opinion, the easiest way to handle this is to replace the whole screen. Yes, it's more exspensive, but consider that it is most likely to fix your problem. A replacement screen comes with the power inverter, both bulbs, and the cable; already assembled and ready to install.

Posted on Mar 06, 2010

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White screen acer


White screen when you start the laptop, and then when you connect an external VGA monitor, you can only operate in Safe Mode?

Or white screen except when you are Safe Mode?

Doesn't matter anyway, just wanted to see what you are stating.

1) Have you connected an external VGA monitor to the laptop, and seen if you get a good display on the external VGA monitor?

No display on external monitor?
You have at least 3 display options available;
A) Internal monitor of laptop ONLY
B) Internal monitor of laptop AND external VGA monitor.
C) External VGA monitor ONLY

Hold the Fn key down, and tap once on the F5 key.
(The F5 key is the Display Toggle-Over key)
Still no?
Hold the Fn key down again, and tap once more on the F5 key.

Good display on external VGA monitor?
Problem is the Video Cable, or inside the Display Assembly.

White screen on external VGA monitor also?
Problem is the graphics chipset.

[Actually it is probably inadequate cooling for the graphics chipset, and this makes a bad contact of graphics chipset TO motherboard. If this is found to be the problem I can explain further, and in much more detail ]

Inside the Display Assembly:

A) Screen Inverter if it is CCFL backlighting.
May or may NOT be a screen Inverter if it uses LED backlighting.

[ CCFL - Cold Cathode Fluorescent Lamp
LED - Light Emitting Diode ]

B) LCD screen.

Video Cable:
The Video Cable connects to the motherboard, in an area either under the Keyboard, or under the Switch Cover, or bottom of the laptop.

[Switch Cover,
Goes by many names. It is the strip of plastic above the Keyboard, and below the LCD screen. Usually has the Power On button, and LED indicator lights; plus speakers, sometimes ]

From there the Video Cable goes under the left Hinge, and up into the Display Assembly.
If a screen Inverter is used, a small cable comes from the main cable, and plugs into the screen Inverter.
The main cable connects to the back of the LCD screen.

Due to normal repeated opening, and closing of the laptop; the Video Cable may be pulled on.
This can create a bad connection on motherboard side, and/or screen Inverter cable connection, (IF used), or to the back of the LCD screen.

It can also cause damage to the Video Cable.
(Stretched/Broken wires)

Once you post the product number I can guide you step by step, show you the components I'm talking about, and track down a Service Manual link, and possibly pictorial disassembly information.

The Video Cable connections are checked first.
A loose connection can cause what you are seeing.

The sheath of the Video Cable is also scrutinized for damage.
Obvious damage to the sheath, may mean damage to the tiny wires inside the Video Cable.

Another thing that can cause what you are seeing.

Video Cable connections prove not to be the problem, then the Video Cable is to be removed, and a continuity test performed on it.
Multimeter set to OHM's. (1K)

If a multimeter is not at your access, then suggest taking the Video Cable down to the nearest small computer shop, and have the resident tech check it for continuity. Should only be a couple of bucks.

YOU MUST rule out the Video Cable as the problem, before going on.

Video Cable checks out?
Then if a screen Inverter is used, this is the next component in the diagnostic flowchart.

Problem is this; it requires a sensitive multimeter to test a screen Inverter. Think fairly expensive,

http://www.fonerbooks.com/test.htm

The plastic frame in front of the LCD screen, is the Display Bezel.
The screen Inverter is located behind the Display Bezel, and mounted down towards the bottom of the LCD Screen Frame.

Due to the multimeter issue, the above noted ease of accessing to replace, and the usually low cost of the screen Inverter; most decide to just replace.

Screen Inverter replaced? Same problem?
The problem is the LCD screen.

No screen Inverter used? The problem is the LCD screen.

Video Cable; Usually around $9 to $20
Screen Inverter; Same.
LCD Screen; from $70 to $240. Just depends on what Lenovo laptop we're talking about here.

This is why you diagnose first.
Would be foolish to assume the problem is the LCD screen, and purchase one; when the problem may have just been a loose Video Cable connection, or one of the $9 to $20 components stated above.

Ready to diagnose?
Post the Product Number back in a Comment.

Regards,
joecoolvette

Jan 22, 2013 | Acer Computers & Internet

1 Answer

I can only see half of my screen


I suggest you have a bad LCD screen.

HOWEVER the procedure is to diagnose, and not spend money foolishly.

I need to know the laptop manufacturer name, and model number.
I cannot for the life of me believe FixYa would not ask for this, as a general requirement.

The model number is on the Bottom of the laptop.
Post back in a Comment.

In the meantime,

1) Check the graphics chipset first.
Connect a VGA monitor to the VGA port, on the laptop.
If the VGA monitor shows the same horizontal split of the LCD screen, then your graphics chipset is bad.

Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port, on the laptop.
This is an example of a VGA Cable, and VGA connector (Port),

http://en.wikipedia.org/wiki/VGA_Connector

Scroll down a little for an example of a VGA Cable.

You can use a CRT type of monitor (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.
By factory default settings the display should show on the external monitor.
IF not;

There are at least 3 display options;
A) Internal monitor of laptop ONLY.
B) Internal monitor of laptop AND external VGA monitor.
C) External VGA monitor ONLY.

Here's where it gets rough, Dawn;
Hold the Fn key down, and at the same time tap once on the Display Toggle-Over key.

What key is that? Dunno. Laptop manufacturer name, and model number wasn't stated.
HP is usually the F4 key.
Acer? F5 key
Lenovo/IBM? F10 key.

The F key at top should have a monitor outline symbol, and an arrow on one side; for the Display Toggle-Over key.
No display on external VGA monitor?
Hold the Fn key down again, and tap once more on the Display Toggle-Over key.

Same display of internal monitor on the external VGA monitor?
Bad graphics chipset. Actually it is probably the MOUNTING of the graphics chipset TO motherboard.
More on that if it is the problem.

Good display on external VGA monitor?
Problem is the Video Cable, or inside the Display Assembly.

2) Video Cable:
The Video Cable connects to the motherboard, (In an area under the Keyboard, or Switch Cover above it), runs under the left Hinge; and up into the Display Assembly.
From there it may have a small cable coming from it, that connects to the screen Inverter.
The main part of the Video Cable then connects to the back of the LCD screen.

CCFL backlighting uses a screen Inverter.
(Cold Cathode Fluorescent Lamp)
LED backlighting May, or May Not.

Due to repeated normal opening, and closing of the laptop; the Video Cable may become pinched.
This can cause pulling on the Video Cable, and loose connections.

It can also cause damage to the tiny wires inside the sheath, of the Video Cable.
(Stretched/Broken)
If you see apparent damage to the sheath of the Video Cable, suspect damage to those wires inside.

Loose connection of Video Cable TO motherboard, or TO screen Inverter, (IF used), or back of LCD screen connection.

The procedure is to remove what components are needed from the laptop, to access the motherboard connector side of the Video Cable; and PHYSICALLY check to see if it is plugged in tightly.

{Components may only be the Switch Cover.
Above Keyboard, and below LCD screen. Has the Power On button, indicator LED lights, and perhaps speakers.

May be the Switch Cover AND Keyboard.
May be the Switch Cover, Keyboard, and Palm Rest Cover; in order to access the motherboard connector of the Video Cable }

Disconnect the LCD screen from the Display Cover, to access the LCD screen side connection, of the Video Cable.

Once all connections are proved to be tight, try the laptop again without fully reassembling. See if you can connect everything, with the LCD screen sitting out a little. Perhaps the Switch Cover off, but wires connected.

HOWEVER of you see apparent damage to the sheath of the Video Cable, or if you don't; the Video Cable MUST be ruled out before going on.

Connections tight? Didn't repair the problem? Remove the Video Cable.
A continuity test of the Video Cable must be performed, with a multimeter set to OHM's.
EVERY wire in the Video Cable must be checked for continuity.

Also an assistant is needed to gently wiggle the cable in the middle, and see if you get an intermittent reading on the multimeter.
If so this indicates a broken wire inside the Video Cable.
Replace.

Not everyone has a multimeter laying around.
Suggest take the Video Cable to the nearest small computer shop, and have the resident tech check it for continuity.
Should only be a couple of bucks.
(They say they can't check it? GET OUTTA THERE!
That ain't no REAL tech! Lol!)

Video Cable checks out?
Then the next component to check is the screen Inverter, again IF used.
Problem is to check a screen Inverter requires a sensitive multimeter.
Read fairly expensive,

http://www.fonerbooks.com/test.htm

For the above reason; the ease of access to replace, (Just remove Display Bezel), and usually low cost; the screen Inverter is usually just replaced. Average cost is around $20, or less.

Screen Inverter isn't used? Problem is LCD screen.
Screen Inverter replacement didn't repair the problem?
Problem is LCD screen.

I know the above may look like, "Wah, wah, wah", from Charlie Brown. (That's what my niece tells me)

If I had the manufacturer name, and model number, I may be able to give you a link to a Service Manual, and possibly pictorial, or video guides; PLUS step by step info from me.

Makes it less, "Wah, wah, wah", lol!

For additional questions please post in a Comment.
Regards,
joecoolvette

http://www.insidemylaptop.com/taking-apart-hp-pavilion-dv7-laptop-guide-3/

http://www.insidemylaptop.com/how-to-replace-screen-on-hp-pavilion-g7-laptop/

http://www.manualowl.com/m/Acer%20Computers/Aspire-7738G/Manual/114625

Jan 21, 2013 | Computers & Internet

1 Answer

Dropped my laptop now 1 half of my screen is white and the other half is fine


Hardware damage

1) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port on the netbook.
The VGA port is on the Left Rear side.

This is an example of a VGA Cable, and VGA connector,

http://en.wikipedia.org/wiki/VGA_connector

Scroll down a little for the VGA Cable example.
NOTE* Color does Not matter. Usually it is Blue. Can be Black or White in color.

You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

2) Turn the monitor on. If a CRT type of monitor allow it to warm up.
Turn the laptop on.
By factory default the display should show on the external monitor.

However there are at LEAST 3 display options available;

A) Internal monitor of laptop ONLY
B) Internal monitor of laptop AND external VGA monitor
C) External VGA monitor ONLY

Press, and hold down on the Fn key, (Bottom left corner of Keyboard), and at the SAME time tap once on the F4 key.
(The F4 key is the Display Toggle-Over key)

No display on external VGA monitor?
Hold the Fn key down again, and tap once more on the F4 key.

Display good on the external monitor? Fine. Your graphics chipset is good. Problem lays within the Display Assembly, (LCD screen, Display Cover, etc), or the Video Cable.

Also posted in case you do not repair the netbook, or repair is set for a later date. This way you can at least use the netbook at home.

Remove ALL power. Remove the AC adapter (Charger), and Battery.

Video Cable:
The video cable attaches to the motherboard, in the upper left area near the left Hinge.
It then leads under the left Hinge, and up into the Display Assembly.

(LCD screen/ Display Cover, Display Bezel, etc. is the Display Assembly)

From there it connects to the back of the LCD screen.
(The Mini 110-3135dx has LED backlighting, and does not use a screen Inverter )

Just due to normal opening, and closing of the laptop, the Display Panel Cable, (HP for Video Cable), can be pulled on.

This means the connection of the Display Panel Cable, at the motherboard side could have been pulled loose, or at the LCD screen side.

It can also damage the tiny wires inside the Display Panel Cable.

From your description, it sounds like the Display Assembly was open, when it landed.
Display Panel Cable connections should be PHYSICALLY, plugged in to ensure the connections are tight.

A visual examination will NOT do.
Connection on the motherboard side AND -> LCD screen side.

If there is visual signs of damage to the Display Panel cable's sheath, also suspect damage to the tiny wires inside the Display Panel Cable. (Stretched/Broken)

Check the connections first. You can leave the laptop partially disassembled, and check, before putting it back together.

If physically checking, by trying to plug the two connections of the cable in, does no good, you have to suspect if the Display Panel Cable may be damaged.

A continuity check with a multimeter set to OHMs, and checking each wire in the cable, is the next step of the diagnosis.
You can take the cable down to the nearest 'Mom and Pop' computer store, and have the tech check it for a few dollars.

Or due to the price of a replacement you may just wish to replace, and see if that was the problem.

The HP part number is HP 607755-001.

HOWEVER, this is supposed to be for a kit that contains 3 cables.
1) LCD Cable (Display Panel Cable)
2) Webcam Cable
3) Power Cable.

[ Power Cable:
The DC Power Jack is the jack on the laptop, that you plug the AC adapter ( Charger ), into.
The DC Power Jack is NOT soldered to the motherboard, with this model.

Instead it is soldered to a cable of wires, and the wires end in a plug.
The plug is unplugged from the motherboard, and the entire assembly is replaced as a unit. (It's a Power Jack Harness, really)

DC Power Jacks get broken. This one will be easy to replace ]

http://www.aliexpress.com/store/product/LCD-video-Cable-for-HP-Mini-110-110-1000-110-1100-Laptop-LCD-Cable-6017B0207601-6017B0232102/908032_556440323.html

Check the part number on your Display Panel Cable, and see if it matches up to the one you are going to buy, is the best method however.

Display Panel Cable checks out OK, or you have replaced it, and it doesn't solve the problem, the problem is the LCD screen.

Again, in my searching of the LCD screen replacements, I found they all use LED lighting for your model. (Mini 110-3135dx)
LED backlighting as a rule now, does Not use a screen Inverter.

Could I be wrong, and your laptop does indeed have a screen Inverter?
Only you will know once you open the Display Assembly, and check the Display Panel Cable connection at the back of the LCD screen.

If a screen Inverter is used it will be in the Display Assembly.
A screen Inverter could easily have been damaged in a fall, and a bad screen Inverter COULD show the results you stated.
I say -> COULD.

I believe the Display Panel Cable connection may be loose at the motherboard side, and/or LCD screen side, or it may be damaged.
If not I believe the LCD screen is the problem.

To check the Display Panel Cable on the motherboard side, for this model, you have to remove the Top Cover. (HP for Palm Rest Cover)
This means the Static sensitive hardware components for the laptop, will be exposed.

This means you NEED to wear an ESD wrist strap, once the Top Cover is removed.
BEST method however is to just put it on BEFORE starting to disassemble. This way you do not forget, and have a Static shocked laptop, that is only going to be good enough for a DOORSTOP.

One example,

http://www.radioshack.com/product/index.jsp?productId=2103245

The alligator clip needs to be connected to a good ground source.
I connect to an unpainted surface, of the metal frame of an open, empty desktop computer case.

You can also set a large metal serving tray (Unpainted), on the table you're working on, and connect to it.
Or a large metal knickknack. (Unpainted)

Pictorial guide that may help. Allows you to see someone working on an HP Mini,

http://www.insidemylaptop.com/replace-keyboard-in-hp-mini-1033cl-notebook/

Service Manual from HP Support (Free),

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lc=en&product=4307901&


In the list click on -
HP Mini 110 and Compaq Mini CQ10 - Maintenance and Service Guide

[ Note*
On page 65 it shows the Wireless LAN cables.
Number 6 states,
"Disconnect the display panel cable from the motherboard"
It is actually referring to the Figure on the next page. Page 66.
And Number 1 ]


For additional questions please post in a Comment.

Regards,
joecoolvette

Oct 23, 2012 | HEWLETT-PACKARD HP Mini-Notebook...

1 Answer

When I turn on my HP Pavilion 1x1000 It stays on ,but there is no image on the screen, and stays on please help.


A) Post THE Product Number on the bottom of the laptop. It's in the white Service Tag. P/N = Product Number.

B) On the left/bottom side of the LCD screen frame (Display Bezel), there is a switch. Looks like a small button.

This is the Internal Display Switch. (May not be in this exact position for your model. Look around on the Display Bezel, that surrounds the LCD screen)

When the laptop is closed, the switch turns off the display, (Image on screen), with the computer still on.
Tap it a couple of times lightly, with the eraser on the end of a number 2 pencil.

See if anything happens. That switch may be bad.

C) Laptop off, monitor off, connect a VGA monitor to the VGA port on the laptop.

Example of a VGA cable, and VGA connector, (Port),

http://en.wikipedia.org/wiki/VGA_connector

You can use a CRT monitor, (Looks like a small TV), or a flat LCD screen monitor if it has a VGA cable.

C) Turn the monitor on. If a CRT type of monitor allow it to warm up.
Turn the laptop on.

By factory default settings, the display should show on the external VGA monitor.

IF not;
There are at least 3 display options,

1) Internal monitor of laptop ONLY
2) Internal monitor AND external VGA monitor
3) External VGA monitor ONLY

Press, and hold down on the Fn key. At the same time tap once on the Display Toggle-Over key.

Don't know what exact HP laptop you have. For most HP's it is the F2 key, or the F4 key, that is the Display Toggle-Over key.
(Key has an empty rectangle on it, with a vertical line on each side)

Still no display on the external VGA monitor?
Hold the Fn key down again. (Bottom left of Keyboard)
Tap once more on the Display Toggle-Over key

NO display on the external VGA monitor, means you have a bad graphics chipset.

(By using an external VGA monitor, you are bypassing the Internal Display Switch, and the Display Assembly. (Internal monitor of laptop)

If you have a display on the external VGA monitor, you have a problem with;

1) Video Cable, (Display Panel Cable for HP)
or
2) Display Assembly

Post back with your results, and if you have a display on the external VGA monitor, we will go on.

If you do not have a display on the external VGA monitor, you are looking at motherboard replacement.

Post back in a Comment.

Regards,
joecoolvette


May 13, 2012 | HP Computers & Internet

2 Answers

No display on laptop


Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.

Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.

If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.

Apr 29, 2012 | Computers & Internet

1 Answer

Screen blank


Post the manufacturer and model number of the laptop. Model number is located on the bottom of the computer. In the meantime I can only give you a generic diagnosis to follow;

1) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA port on the laptop.

This is an example of a VGA Cable, and VGA connector, (Port),

http://en.wikipedia.org/wiki/VGA_connector

(On the laptop near the VGA port it may have RGB, or External VGA, or nothing )

You can use a CRT type of monitor, (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable attached.

2) Turn the monitor on. If a CRT type allow it to warm up.
Turn the laptop on.

By factory default settings, the display should show on the external VGA monitor.

IF not; Hold down on the Fn key, and at the same time tap once on the Display Toggle-Over key.

The Display Toggle-Over key will be one of the F keys at the top of the keyboard. (F1 through F12)
HP laptops for example, usually use the F4 key.

After performing the above, there is no display on the external VGA monitor;

There are at least 3 display options available;

1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY

Hold the Fn key down again, and tap once more on the Display Toggle-Over key.

NO display shows on the external VGA monitor?
You have a bad graphics chipset, or the mounting of it to the motherboard is bad.

Display shows on external VGA monitor?
You have a problem with the Video Cable, or in the Display Assembly itself.

A) Video Cable:
This cable connects to the motherboard, under the Keyboard area, or just above it.
It then goes along, and up under the left Hinge.

From there it goes up into the Display Assembly, and connects to the back of the LCD screen.
There is also another wire, or two, that comes from the Video Cable, and connects to the screen Inverter

Primer:

An LCD screen does not produce light by itself. It needs an additional light source. A Backlight is the additional light source.

A Backlight can be a CCFL, (Or two of them), or a series of LED lights.
(These two technologies are used in the present )

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

[ Average size is 2mm Thick, and the length is almost as long as the LCD screen is in height.

2mm is a little larger than 1/16th of an Inch.
More information on CCFL, and general guide to replacing,

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/ ]

A screen Inverter is used to convert the power from the laptop, for the LCD screen, and Backlight.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.

Some average examples of a screen Inverter used in a laptop,

http://www.laptopparts101.com/screen-inverter-board/

The thin plastic 'frame' in front of the LCD screen, is a Display Bezel. Has many names, depends on the manufacturer.

The screen Inverter is located behind the Display Bezel, and mounted at the bottom of the LCD screen. (Usually)

Primer over.

Check the video cable connection on the motherboard side, and at the back of the LCD screen.

Just with opening, and closing the laptop, the video cable could have been pinched in the Hinge.
This would lead to the video cable being pulled on, and pulling a connection loose. (Or both connections)

It could also lead to damage of the video cable.
Check the cable's outside sheath for obvious signs of damage.
This may indicate damage to the tiny wires inside.
(Stretched/broken)

It is best to completely remove the video cable, and with a multimeter check the wires inside for continuity. (Set the Function knob to Ohms)

B) Display Assembly:

The Display Assembly consists of the;
1) Display Bezel
2) Display Cover. (Top cover of laptop over LCD screen )
3) LCD screen
4) Hinge brackets, and Hinges
5) screen Inverter
6) Backlighting
7) Web camera (IF installed)
8) Microphone (IF installed in Display Assembly )
9) Screen Frame (Holds the LCD screen assembly together )

If the Video Cable checks out OK, move on to the screen Inverter.
Look to see if the cable (Wires) connections to the screen Inverter are tight.
Physically check, do not assume by just looking.

Is there any obvious signs of damage to the screen Inverter?

To test a screen Inverter requires a sensitive multimeter. Read fairly expensive,

http://www.fonerbooks.com/test.htm

Due to the fact;
1) That most do not have a multimeter of this type around,
2) The ease of accessing to replace a screen Inverter,
3) The usually low cost of the screen Inverter,

, the screen Inverter is replaced. Parts changing I know, but you have to use what is available to you.

Replaced screen Inverter, and you still have no display on the laptop's internal monitor?
Replace the LCD screen.

Note*
If a laptop uses CCFL for Backlighting, there is going to be a screen Inverter.
If a laptop uses a series of LED lights for a Backlight, there MAY, or MAY NOT be a screen Inverter.

In this case the LCD screen itself is replaced.

If you post the laptop manufacturer, and Model Number, (In a Comment), I may be able to link you a Service Manual. Also there may be pictorials with disassembly information.

Guide you as if I was sitting next to you.

Regards,
joecoolvette

Apr 28, 2012 | Computers & Internet

1 Answer

Screen blank with white dot


Problem with;

1) Video cable:

A) Video cable connection on motherboard side is loose, and/or on back of LCD screen.

B) Video cable is damaged.

2) screen Inverter:

screen Inverter is bad.

3) LCD screen:

LCD screen is bad.

4) Graphics chipset:

Graphics chipset is bad.

Suggest you connect a VGA monitor to the VGA port (Connector) on your laptop.
See if the problem is the graphics chipset, Or video cable, Or display assembly.

You didn't state what manufacturer and Model Number of laptop this is.
All I can do is state generic information.

This is an example of a VGA Cable, and VGA connector,

http://en.wikipedia.org/wiki/VGA_connector

The VGA connector will be on the side, or back of your laptop.
For the VGA monitor you can use a CRT type monitor, (Looks like a small TV), or a flat LCD screen monitor that has a VGA cable.

Laptop OFF, monitor OFF, connect the external VGA monitor to the laptop.
Turn the monitor on. If a CRT type allow it to warm up.

Turn the laptop on.
By default the display should show on the external VGA monitor.
IF not;

There are at least 3 display options.
1) Laptop internal monitor ONLY
2) Laptop internal monitor AND external VGA monitor
3) External VGA monitor ONLY

Press, and hold down on the Fn key, and at the same time tap once on the Display Toggle-Over key.
(For an example HP's usually use the F4 key for a Display Toggle-Over key)

Display shows the same on the external VGA monitor?
You have a bad graphics chipset.

[ Some laptops have been erroneously stated as having a graphics card, when in fact they do not.
The GPU (Graphics Processing Unit) is soldered directly to the motherboard.
This is Integrated Graphics.

http://en.wikipedia.org/wiki/GPU

There is no changeable, replaceable graphics card. Therefore the solution is motherboard replacement ]

IF, the display is good on the external monitor, you have a problem with the Video Cable, and/or in the Display Assembly.

After diagnosing with an external VGA monitor, post back in a Comment.
Also post the manufacturer name, and model number of the laptop.

Regards,
joecoolvette

Apr 22, 2012 | Computers & Internet

1 Answer

Keyboard lights up screen stays black....after inserting recovery disk screen still remains black...


Would like you to attach an external monitor for a diagnoses.

A VGA monitor.
Can be a CRT monitor that resembles a small TV, or a flat LCD screen monitor, that has a VGA cable attached,

http://en.wikipedia.org/wiki/VGA_connector

1) Laptop OFF, monitor OFF, attach the VGA cable of the monitor to the laptop's VGA connector.

[For the HP Pavilion dv6000z Notebook PC, the VGA connector is on the Left side at the Rear. Second port from the rear. 15 pins.
3 rows of 5]

2) Turn the monitor on. If a CRT style allow it to warm up.
3) Turn the laptop on.

By default the display should show on the external VGA monitor.

If not, press, and hold down on the FN key,
(Second key from the left, on the Bottom row on the Keyboard),
and tap on the F4 key.
(Top of Keyboard towards the left)

Still no? Hold the Fn key down again, and at the same time tap on the F4 key.

There are 3 display options;

1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external VGA monitor
3) External VGA monitor ONLY

IF, the display shows up on the external monitor, and if it is OK, the problem lies in the Display Assembly, and/or the Video Cable.

More on that in a moment.

IF, the display does Not show up on the external monitor, or if it is garbled, the graphics chipset is bad.

HOWEVER, there is a problem with the graphics chipset, for the dv6000 series of HP Pavilion Notebook PC's.
More specifically it isn't actually the graphics chipset itself, but the mounting of the graphics chipset to the motherboard.
More on this in a moment.

External VGA monitor shows a good display;
Video Cable:
The video cable is checked for apparent damage first, and at the same time, see if it's connectors are tightly plugged in.

On one end, the video cable is plugged into the motherboard.

(ALL power removed, AC adapter { Charger} and Battery, the Switch Cover is removed, and the Keyboard, far enough to lay it back out of the way. Keyboard Cable still attached to motherboard. The Display Cable is the one to the Far left, right under the left side of the LCD screen. The cable next to it, to the immediate right, is the Microphone Cable )

The video cable routed from the connection on the motherboard, up under the left Hinge Cover, and into the Display Assembly, where it then attaches to the Back of the LCD screen.

THIS connection must be checked also.

{ Just gave advice similar to this earlier. The asker's problem turned out to be a loose video cable connection, on the back of the LCD screen }

Examine the sheath of the video cable. See if there are signs of damage. If so the tiny wires inside the cable could be damaged.
Apparent damage or not, you may want to remove the video cable, and perform a continuity check with a multimeter. (Ohm's. Check each wire in the cable)

Video Cable connections prove to be tight, video cable continuity check proves video cable is OK, move on to the screen Inverter.

Primer:
An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight can be a CCFL, or a series of LED lights.

The Backlight is a CCFL for an HP Pavilion dv6000z Notebook PC.
[It is 2mm Wide, and 334mm Long. Or a little thicker than 1/16th inch Wide, and a little over 13 inches Long ]

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.

A screen Inverter is used to convert power (Electricity) from the laptop, FOR the Backlight, and LCD screen.

90 PERCENT OF THE TIME the fault is a bad screen Inverter.

Example of a screen Inverter for a Pavilion dv6000z Notebook PC,

http://www.nylaptopparts.com/index.php?main_page=product_info&products_id=560

The thin plastic frame that surrounds the LCD screen, and is in front of the LCD screen, (Resembles a picture frame), is the Display Bezel.
The screen Inverter is located behind the Display Bezel, and at the bottom of the LCD screen area.

http://www.insidemylaptop.com/remove-replace-lcd-screen-inverter-hp-pavilion-dv6000-laptop/

http://www.insidemylaptop.com/take-apart-hp-pavilion-dv6000-laptop/

External VGA monitor does NOT show a good display, it is a graphics chipset mounting issue, more to follow.
Regards,
joecoolvette

Jan 15, 2012 | HP Pavilion dv6000z Notebook

1 Answer

HP COMPAQ 6715b screen wont come on


Suggest you use a VGA monitor as an external monitor.

Can be a CRT monitor that resembles a small TV, or a flat LCD screen monitor that has a VGA cable coming from it.

Laptop OFF, monitor OFF, attach the VGA cable of the monitor, to the VGA port on the back of the laptop.

[ Example of a VGA port {Connector}, and a VGA cable,

http://en.wikipedia.org/wiki/VGA_connector ]

Turn the monitor on. If it is a CRT model let it warm up.
Turn the laptop on.

The display should automatically come up on the external monitor. If not press, and hold down on the Fn key, then tap once on the F4 key.

Still no? Tap the F4 key again.



1) No graphics, or display, shown on the external monitor, means there is a problem with the graphics chipset.

The motherboard chipset is an AMD RS690T. Also known as AMD M690T.
Usually coupled with an AMD SB600 southbridge chip, and ATI Radeon X1250 graphics chipset.

The graphics chipset is soldered to the motherboard with a BGA surface mount.
(Ball Grid Array)

http://en.wikipedia.org/wiki/Ball_grid_array


To explain the BGA surface mount I'm going to use an older Intel Pentium 4 processor, and it's Socket 478 processor socket.

The processor has contact pins on the bottom. 478 of 'em.
This is an example of the Socket 478 processor socket,

http://en.wikipedia.org/wiki/Socket_478

There are 478 socket holes.

With a chipset using a BGA surface mount there are No contact pins. There are Solder Balls in place of the pins.
There is no socket on the motherboard. There are Copper Pads which take the place of the socket holes.

The graphics chipset is set into place with the Solder balls lining up on the Copper Pads.
Heat is then applied at a specified temperature, and length of time, and the solder balls melt.
This solders the chipset to the Copper Pads, which in turn solders the chipset to the motherboard.

If excessive heat is developed, due to the laptop has never been cleaned inside, air intake duct for the fan has been blocked, or a poor cooling design for the graphics chipset, the solder connections start to partially melt.

This results in a poor contact of the graphics chipset to the motherboard.
No graphics (Display) being shown on the internal monitor of the laptop, and external monitor, is one result.

The HP Pavilion dv2000, dv6000, and dv9000 series of Notebook PC's have this problem. It's due to a poor cooling system design for the graphics chipset, The HP Compaq 6715b Notebook PC could fall into this category,

http://www.youtube.com/watch?v=bnkQNmKauEc


2) Graphics, or display shown on the external monitor, means there is a problem with the Display Assembly.

A) Could be a loose connection of the Video Cable.
Video Cable connection to the motherboard could be loose, and/or video cable connection to the LCD screen, could be loose.

B) Could be damage to the Video Cable. (Display Cable)
The Display Cable runs very close to the left Hinge. It could be pulled on, and result in a poor connection, or pinched, and damaged.

Look at the Display Cable's sheath. See if there is apparent damage to the sheath.
If so this means there may be damage to a wire, or wires, in the Display Cable.

There may Not be any apparent visual signs of damage.

Remove the Display Cable out of the laptop, and perform a continuity test of each wire.

[ An economical, yet decent multimeter, can be purchased for around $8 to $12. Many stores carry them. An auto parts store is but one example.

Analog with a needle, and face, or Digital with a digital readout, is fine. Either style will do.
(I prefer Analog)

Set the Function Knob to Ohms. (1K or 10K)
The Red probe lead is the Positive lead.
The Black probe lead is the Negative lead.

The Positive lead is touched to one end of a wire in the Display Cable, and the Negative lead is touched to the other end of the wire. (Using alligator clips on the ends of the probes, helps a lot)
Follow the wires.

You are not concerned at this point of the actual reading. You are just concerned if there IS a reading.
No reading indicates a broken wire.
Also have a helper gently wiggle the Display Cable, and see if there is an intermittent reading.
(Reads, then doesn't read)
This also indicates a broken wire.

Display Cable checks out OK, then move on to the screen Inverter.
This is a small rectangular circuit board located behind the Display Bezel, and mounted at the bottom of the LCD screen.

Example,

http://www.batterycentury.com/hp-6715b-inverter-p-183533.html

Still no?
The problem is the LCD screen.

HP Compaq 6715b Notebook PC Service Manual, from HP Support, (Free),

http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=101&prodTypeId=321957&prodSeriesId=3368540#3

On this page left-click on the first file, listed under the Service and maintenance information heading,

HP Compaq 6715b and 6715s Notebook PC, HP Compaq 6710 and 6710s Notebook PC - Maintenance and Service Guide

This is a PDF file. The computer you are using now has Adobe Reader on it, which uses PDF files.
After you click on the above file name, it may take up to 30 seconds before the first page comes up.
It may also take additional time for the file to fully download.

Display Assembly removal starts on Page 81.


For additional questions please post in a Comment.

Regards,
joecoolvette

Oct 02, 2011 | HP Computers & Internet

1 Answer

Hello, I have a Compaq CQ60 and have problems with the LCD display, which works intermittently. I had the entire LCD replaced about 4.5 months ago. Worked great until a couple weeks ago, the LCD went...


is this a CCFL LDC
if yes the inverter is bad. (a card tiny, and thin)
its old LT.
the books are gone now.
the service book tells you how to replace the CCFL inverter
find a used good one is problematc.
why not buy a newer LT
or just run the external screen and be happy

I guess you have not read the user guide yet?
about the VGA hot key.
mine has.:
1: external only
2: internal only
3 both
4: auto. (i think only my newer HP has this)
mine is Fn+f4, but on a relic compaq, gee buy the book,
or google search for it for weeks,

next time post to HP< there is no COMPAQ for years.
hp owns it. totally

ever seen this before. the fail like LT batteries do. often.

http://www.ebay.com/itm/New-15-6-Laptop-Screen-LCD-Inverter-for-Hp-Compaq-G60-G50-CQ50-CQ60-Series-/251312052451?hash=item3a835d98e3:g:ARYAAOSwal5YJoxR


search there "compaq CQ60 inverter"
bingo.


when the sceen is dead do this.
see the flash light here, BINGO? bingo for inverter *****?

http://pcdied.com/black-screen.html#Dimbulbs

Mar 23, 2017 | Compaq Presario CQ60-212US Notebook

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