Question about HP PavilionCongo Motherboard Skt462 Via KM13A AMD 2 Dimm Motherboards

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ZE5470 us Hp Laptop Screen problem

This laptop will work fine conected to a External monitor , but the lcd screen backlight does not work but I can see very dimly the proper images on the screen .

I tried a used replacement from e-bay and the same thing happen again no back light but still screen images can still be seen.

supposedly the replacment had been tested for back light and inverter and working oder

Ihave a working 4100 series can iuse that in any way to help determ what I need

Posted by on

  • JOhn190 Aug 22, 2008

    Im not sure you understand we are talking about a laptop can see images no backlight only with ext monitor hooked

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6 Answers

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For parts
cgi.ebay.com/LCD-Inverter-Backlight-HP%2FCompaq-2100-2500-2200-NX9010_W0QQitemZ350090317479QQcmdZViewItem... - 110k

backlight repairs
http://www.fonerbooks.com/laptop_5.htm

laptop screen repairs
http://www.sparepartswarehouse.com/Laptop,LCD-Screens-Repair.aspx

Posted on Aug 22, 2008

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You need to test inverter and backlight voltage. If they are fine, lamp is not monted in the right way.

Posted on Aug 22, 2008

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Try this steps for screen replacement from one laptop to other

Close laptop and lay it down on it's lid(bottom facing upwards).
Remove battery.
Remove EVERY screw you can see on the underside (even the one that holds the cmos battery(as I think it doubles as an anchor for the keyboard). Most are small crosshead, but you may need a flat top for one or two.
There are also 'hidden' screws - on the front edge(3 I think) and either side of the back (where the usb/video ports are)(2). The panels that hide these look like little plastic square blanking plates. These just pry off(they are just stuck on, the screws are behind them) I would hold off removing the ones off the back (4 screws) for the moment as these attach the screen to the chassis
Once all screws removed, turn laptop over and open it up. You should now be able to prise off the keyboard (use a small screwdriver or knife to get under the keyboard, it is held by a connector towards the centre but, should pop off provided the screw from the underside is removed.
Once keyboard is off, there is one screw to remove, which holds the screen to the motherboard, and one or two others securing the rest of the keyboard surround.
Remove the keyboard surround, and you should be able to see the anchor points in the left and right corners of the laptop chassis (under the screen).
You should then be able to remove the last 4 screws from the back of the case (the hidden ones). Screen should lift off. Then do the opposite to put lid back on.

Posted on Aug 22, 2008

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Yes u can use it with the other one

Posted on Aug 22, 2008

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Adjust the resolution and picture setting and then try it.

Posted on Aug 22, 2008

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Hello

Posted on Aug 22, 2008

  • Narmada Anand
    Narmada Anand Aug 22, 2008

    The problem is with the backlight inverter. A very hard piece to find, and one ake the inverter out to find the part number. You can find it at Bliss Computers at http://www.247laptoprepair.com/
    Replace the inverter and your screen would worke fine for only $75!

    Note: inverter won't always be the cause of the problem, but its cheaper to try fixing that first.



    Thanks

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I have a asus x58l and it has a black screen. cant see anything


http://www.asus.com/Notebooks_Ultrabooks/X58L/#support_Knowledge

Don't know why I did that.

Asus Support. Those two words don't even belong in the same sentence. (Neither does Toshiba Support, or Acer Support)

Notice the large statement?

NEED SERVICE?

(In otherwords GOT MONEY?)

Rant over.

Janet,

The problem will be;
1) Graphics chipset
or,
2) Video Cable,
or,
3) screen Inverter,
or,
4) LCD screen

I'm betting it's the economical, and easy to replace - screen Inverter.

Laptop on, shine a bright flashlight at the LCD screen of the laptop; and shine at various angles.

See faint images?
Backlight is out, or screen Inverter is out.
90 percent of the time the fault is the screen Inverter.

Moving on........

A) Graphics chipset:
Laptop OFF, monitor OFF, connect a VGA monitor to the laptop.
The VGA port is on the Back of the laptop.

This is a General example of a VGA port (Connector), and VGA Cable,

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

Scroll down a little for VGA Cable example.
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 VGA monitor.
IF not;

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, and at the SAME time; tap once on the F8 key.
The F8 key is the Display Toggle-Over key.

(User Manual indicates not all laptops, may use the same Function keys.
Whatever Asus.
The Display Toggle-Over key has LCD on it, surrounded by a rectangular line. Has a small monitor icon to the right of it )

Display on external VGA monitor? No?
Hold the Fn key down again, and tap once more on the F8 key.

No display on external VGA monitor, indicates a problem with the graphics chipset.

Display ON external monitor, indicates a problem with the;
1) Video Cable,
or
2) screen Inverter,
or
3) LCD screen

Perform the 'flashlight test'. No faint images go on to the external VGA monitor test.

Post back in a Comment.
We'll go from there.

Regards,
joecoolvette

(There are NO service manuals available, to the public.
Thank Asus for that. To procede though can be done.

This will require a partial disassembly of the laptop, to include removing the Keyboard, and Palm Rest Cover.

Together we can accomplish this if needed.

May do something I never do, and that is because of no Service Manual available. May ask you to buy a replacement screen Inverter, and replace it.
Need other information above FIRST.

Average cost is around $25 to $30.
The plastic frame in front of the LCD screen is the Display Bezel.

The screen Inverter is located behind the Display Bezel, and mounted to the bottom of the LCD screen assembly.

(Clip or a Philips head screw)

Average example,

http://www.ebay.com/itm/100-Genuine-NEW-Original-Asus-X58L-laptop-Series-LCD-Inverter-08G21VJ10107-/290873311574?pt=LH_DefaultDomain_0&hash=item43b9668156

Doesn't require removing Keyboard, and Palm Rest Cover.
DOES require removing all power. AC adapter (Charger), and Battery.

Mar 24, 2013 | ASUS Sabertooth X58 LGA 1366 Intel X58...

1 Answer

I have replaced the screen in my Easy Note TJ65 but the screen is still white


Did you diagnose first?

1) First thing to check is to make sure the graphics chipset is OK.

[Chip and Chipset are slang terms for I.C.
Integrated Circuit,

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

The I.C. for graphics is the graphics chipset, or more properly, the G.P.U.
Graphics Processing Unit,

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

A) Laptop OFF, monitor OFF, connect a VGA monitor to the blue VGA port, on the left side of the laptop.

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,

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

(Scroll down a little bit for example of VGA Cable)

B) Turn the monitor on. If a CRT type allow it to warm up a couple of minutes.
Turn the laptop on.
No display on external VGA monitor?

Hold the Fn key down, and tap once on the F8 key.
(The F8 key is the Display Toggle-Over key)

Still no? Hold the Fn key down again, and tap once more on the F8 key.

[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 ]

Good display on external VGA monitor = good graphics chipset.

Going on.
The problem is the Video Cable, or in the Display Assembly.

Small primer;
An LCD screen does not produce light. 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's.
(Light Emitting Diode)

A CCFL is a Cold Cathode Fluorescent Lamp.
Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height.

The Packard Bell Easynote TJ65 uses LED backlighting.

A screen Inverter is used to convert the power (Electricity), from the laptop; for the LCD screen, and Backlight.
LED backlighting does not use a screen Inverter.

http://www.laptopscreen.com/Spanish/model/Packard%20Bell/EASYNOTE%20TJ65/

Primer over.

You are down to the Video Cable, since you have installed a new LCD screen.

The Video Cable connects to the motherboard either under an area, under the Keyboard; or under the Switch Cover.
It then leads across the motherboard, and through the left Hinge.

From there the Video Cable leads into the Display Assembly, and connects to the LCD screen, and LED backlighting.

Due to just normal repeated opening, and closing of the laptop; the Video Cable connections TO motherboard, and/or TO back of LCD screen; may become loose.

Connection at motherboard side needs to be physically checked; to ensure this connection is not the problem.

You also may not have made a good connection to the back of the LCD screen.

(And it would be logical to also check the LED cable connection, while you are at it. Even though a bad LED connection would cause a dark screen, and not a White one)

Also the Video Cable's sheath should be visually checked for obvious signs of damage.
Any apparent signs of damage to the sheath of the Video Cable; may also mean damage to the tiny wires inside the cable.
(Stretched/Broken)

In your situation you need to know for SURE, if the Video Cable is good. Video Cable should be removed, and a multimeter set to OHM's is used, to check continuity of every wire in the Video Cable.

An economical multimeter is around $5 to $12, if you do not have one. Or take to a small computer shop, and have it checked for a few bucks.

Video Cable checks out for continuity, and connections are Tight; you have a bad new LCD screen, or the wrong one.

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

Nov 21, 2012 | Packard Bell Easy Note Tj65 554bu01031...

1 Answer

Horizontal black line at bottom of laptop screen/ Compaq Presario C700


http://h10025.www1.hp.com/ewfrf/wc/product?product=3559331&lc=en&cc=us&dlc=en&lang=en&cc=us

Alan, let's diagnose;

1) Do you have access to a VGA monitor? (CRT style. Looks like a small TV)
How about a flat LCD screen monitor with a VGA cable?

Need to see if the problem is the graphics chipset, or the Video Cable, or inside the Display Assembly.

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

A) Laptop OFF, monitor OFF, connect the VGA monitor, to the VGA connector on the laptop. (Left side towards the Front)

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

By default (Factory 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 of laptop AND external VGA monitor
3) External VGA monitor ONLY

Press, and hold the Fn key down, (Second key from left on bottom), and at the same time tap once on the F4 key.
(The F4 key is the Display Toggle-Over key)

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

Display on external VGA monitor OK? Problem is the video cable, or inside the Display Assembly.

Line still on display? Problem is the graphics chipset, or it's mounting to the motherboard. (BGA surface mount)

Problem with Video Cable or Inside the Display Assembly:

Video Cable; Display Cable when referring to an HP, or Compaq laptop.

The Display Cable attaches to the motherboard, under the left side of the Keyboard, and towards the front. It then routes under the left Hinge, and up into the Display Assembly.

From there it splits, and connects to the screen Inverter, and back of the LCD screen,

http://www.batterycentury.com/compaq-presario-c700-cable-p-212772.html

{ In the photo; On the right side there is a wide connector, (Top), and a small connector, (Bottom)
The wide connector connects to the motherboard. The small connector connects to the screen Inverter.

The connector to the far left connects to the back of the LCD screen}

Just from normal opening, and closing of the laptop, repeatedly, the cable can be pulled on. It can also be pinched in the left Hinge, and be pulled on.
This can cause two things:

1) Can pull the cable so the connection at the motherboard is loose, or loose at the screen Inverter, or back of the LCD screen. Or all three.

I have repaired a few laptops whereby this was the problem. I also have a few users on here, who reported this was the problem.

You have to remove the Switch Cover, and partially remove the Keyboard, to access the motherboard side connection, of the Display Cable.
You have to remove the Display Assembly, and open it up, to access the LCD screen side connection.

You CANNOT just visually inspect the connections, and assume they are plugged in tightly.
You need to physically, make sure the connections are plugged in tight.

The Switch Cover is just that. A cover.
The Keyboard has a Keyboard Cable, that stays attached to the Keyboard, and is connected to the motherboard connector.

Therefore, when checking to see if just the motherboard connection is the problem; you can just leave the Keyboard Cable attached to the motherboard, and fire the computer up after physically checking the motherboard connection.

{ Flip the Keyboard over, and lay it down on the Palm Rest Cover.
Excuse me. Top Cover for HP and Compaq }

With the LCD screen, and screen Inverter connections, you can lay the LCD screen down on your 'work' table, and try it. This way you can try it to make sure it is the problem, before reassembling the laptop.

Otherwise you will be removing the Display Assembly again, and opening it up, again.

[This will all make more sense as you read on ]

The Display Cable can also be damaged. Visually check the sheath of the cable. ANY apparent damage, may result in damage to the tiny wires inside the sheath. (Stretched/Broken)

Test the wires inside the display cable for continuity. This is done with a multimeter set to OHM's. (1K)
If you do not have access to a multimeter, perhaps take it to a 'Mom and Pop' computer store to have it checked. Should only cost a few bucks.

Display cable connections are tight/ cable checks out?
Problem is the screen Inverter, or LCD screen.

The screen Inverter is checked with a Sensitive multimeter.
Read fairly expensive,

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

Perhaps the 'Mom and Pop' computer store again.

http://www.batterystyle.com/compaq-presario-c700-inverter-p-261900.html

{ A screen Inverter, and an LCD screen are a MATCHED unit. If the Inverter is the problem, make SURE you get the correct one. Same thing with an LCD screen. Make SURE you get the correct one }

Screen Inverter checks out? Problem is the LCD screen,

http://www.screentekinc.com/Compaq__Presario__C700_Series-series-laptops-lcd-screens.shtml

[ALL of the parts shown are just for examples. NONE are for advertising ]

To Add:
An LCD screen cannot produce light,

http://solutions.3m.com/wps/portal/3M/en_US/NA_Optical/Systems/BehindTheScenes/Optics101/

Click on the monitor icon. (I also would click on -> No thanks)

An LCD screen needs an additional light source. A Backlight is the additional light source.
A Backlight can be a CCFL, or a series of LED's.
(Light Emitting Diode)

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

Average thickness is 2mm. That is a little larger than 1/16th of an Inch.
Average length is almost as long, as the LCD screen is in height.
In the next example look at the last 5 photos,

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

The Compaq Presario C700 series of Notebook PC's uses a single CCFL.

A screen Inverter converts the power from the laptop, for the LCD screen, and Backlight.
90 PERCENT OF THE TIME, the fault is a bad screen Inverter.

This is a link to a free Service Manual from HP Support,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?cc=us&dlc=en&lang=en&lc=en&product=3559331&

In the list click on -
HP G7000 Notebook PC and Compaq Presario C700 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.

In the Bookmarks menu to the left;

1) Click on the + sign to the left of -
Removal and replacement procedures
2) Click on the + sign to the left of -
Component replacement procedures

3) Click on one at a time -
Switch Cover
Keyboard
Display assembly
Page 58 for the screen Inverter.

A) Remove ALL power. Remove the AC adapter (Charger), and Battery
B) De-static yourself before working on the laptop. Perhaps there is a large metal serving plate (Unpainted), you can set on the table, or a large metal knickknack. (Unpainted) Touch before working.

C) Use a multi-compartment container, for the various screws you will remove.
Label each compartment for the area the screw/s come out of.
[If no multi-compartment container is available, you can substitute with a clean egg carton. Label each egg holder ]

SOME screws look VERY similar to other screws.
Advise do Not mix them up.

Need advice along the way post back in a Comment. I'm right here.

Regards,
joecoolvette

Jul 26, 2012 | Compaq Presario C700 Series Laptop...

2 Answers

I HAVE A HP DV2000 LAPTOP WITH VIDEO ISSUES , I REPLACED THE MOTHERBOARD BUT STILL NO PICTURE ALL LIGHTS ARE ON AND THE FAN IS WORKING BUT NO VIDEO..


Hook a spare monitor to the video output, usually on the back. If you get a picture it means the inverter board is bad, or the backlight behind the LCD display, check to make sure the round video cable is plugged into the motherboard. But, if the symptom is the same for both screens, the problem is the Video Graphics Card normally built into the motherboard. If the connector to the LCD is damaged that would explain the issue of no video.

Mar 13, 2012 | HP Pavilion dv2000 Series Laptop Full...

2 Answers

My team and I are trying to fix an Acer Laptop who is is being charged and screen does not turn on. We thought it was the power adapter and apparently it is not. So we guessed it might be the motherboard...


test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) Ide/Sata make sure they have a secure connections and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd have secure connections and are not faulty or just replace them they could be faulty ?

even something as small as an electrical extension or a faulty fan lead can cause this problem

a computer needs all of the data and electrical current to travel through every working device and to have an end for a computer to be able work properly

make sure your graphics card is securely seated with no dust in its socket
hope this helps

Sep 15, 2011 | Motherboards

1 Answer

My hp compaq Presario V6500 has been damaged and a computer dude in Bathurst NSW said we need a bulb replaced in the screen as it won't light up. Computer functions via TV. R there any local repairers for...


The monitor screen on your laptop is an LCD screen.

An LCD screen cannot produce enough light by itself. It needs an additional light source.
The additional light source is a Backlight.

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

LCD screens are a composite of layers. The layers are held together by a metal frame, much like a picture frame.
The Backlight is usually located on one side, accessed after removing one side of the metal frame.

As stated, a Backlight is a very small type of Fluorescent lamp, (Tube)
Very fragile, easily breakable, and not usually approached by one who has very little, or no experience in replacing.
More common the entire LCD screen is replaced, which includes the Backlight already installed.

A laptop also needs an Inverter to provide power, both for the LCD screen, and the Backlight.

90 percent of the time the fault is the Inverter.
I repeat, 90 percent of the time the fault is a bad Inverter.

An Inverter is cheaper than an LCD screen, and MUCH easier to replace than a Backlight.

Allow me to show you replacing an Inverter on an HP Pavilion dv6000 series laptop.
Granted, it isn't an HP Compaq Presario V6500 series, but the principles still apply the same,

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

I can also provide a free link, to the Service Manual for an HP Compaq Presario V6500 laptop, direct from HP Support,

http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&lang=en&product=3369429&

In the list click on;
Compaq Presario V6500, V6600, and V6700 Notebook PCs-Maintenance and Service Guide

This is a PDF file.
Allow up to 30 seconds to see the first page, and an additional time may be needed to fully download.

In the Bookmarks menu on the left click on the + sign next to;
1) Removal and replacement procedures
2) Component and replacement procedures
3) Display assembly

And/or go directly to Page 61 to view the Inverter location.

One example of an Inverter for an HP Compaq Presario V6500,

http://www.sparepartswarehouse.com/Compaq,Presario,V6500,Laptop,Inverters.aspx

Granted this is not what you asked for.
My premise is to teach, and hopefully save people money.

If you have additional questions please state in a Comment.
Regards,
joecoolvette

Mar 06, 2011 | Compaq 449901-001 - HP Presario V6500...

1 Answer

I bought hp dv2630ea laptop 3 years ago, recently my laptop screen went into blank, no light, no image on the screen. i brought it to the hp service authorized center in hyderabad, they said problem with...


The LCD screen may be faulty. I suggest you borrow a monitor to test your laptop if you do not already own one.
If the laptop appears to boot up and the hard disk LED flashes, then connect an external monitor to the laptops video port. Power up the monitor and then boot up the laptop and the video information will automatically divert to the external monitor.
If this works then you have a working laptop.

Dec 09, 2010 | HP Motherboards

2 Answers

What are the appropriate steps to connect an external monitor to an HP Pavillion DV2000? When I try, nothing appears on the external screen... Thanks, RF


One of the function keys has a small monitor screen icon. Press that key while holding the Fn key, and you will enable the external monitor connector. These laptops don't automatically sense when you've connected an external monitor. On some models, the first press enables the external monitor and shuts off the laptop screen. If that happens, press the keys again and the laptop screen will come back on.

Oct 14, 2010 | HP 417035-001 - HP Pavilion dv2000 Series...

1 Answer

I HAVE AN EI SYSTEMS 4411 LAPTOP, THE SCREEN APPEARS BLANK AS IF IT DOESNT WORK. EVERTYTHING ELSE WORKS AS IF IT SHOULD. I HAVE HAD IT DIAGNOSED AS THE MOTHERBOARD, BUT HOW CAN I CHECK IT MYSELF? SO I CAN...


Find a friend with an external monitor and connect the laptop to it. On your keyboard will be a combination of the fn key and one of the f keys above that transfers the signal to the external monitor. If you get a fine picture there, you'll know you can only have one of 3 problems.
1. Your screen inverter has shorted out
2. Your backlight has burned out insode the LCD
3. The LCD itself has failed.

You can make your choices from there. If you get NO picture on the external screen, you'll know the video chip on the motherboard has failed.

Best of luck

Apr 01, 2010 | Motherboards

1 Answer

Acer 7520 laptop screen extremely dark


It may be that your backlight has burnt out, or your LCD inverter has gone bad, if you can hear a high pitched sound coming from the screen it is more than likely the converter, you can order replacements online...

Mar 09, 2009 | Acer (ACERMOTHERBOARD)

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