Question about HP Pavilion dv2500t Notebook

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The screen on my laptop doesn't work. I'm able to

The screen on my laptop doesn't work. I'm able to get video on an external monitor through the VGA. I've tested the lcd power inverter with other laptops and it checks out fine. The video cable that connects the motherboard to the lcd is fine and in place. I've check continuity on every wire on the cable from on end to the other and all cables checkout fine. I'm thinking it's not getting any video output at the motherboard. Is there anyway to find out. Also I get 18v at the power inverter. This is an HP dv2500.

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Best advice would be to replace the screen it appears that the back light has failed you could probably find one on www.ebay.co.uk reasonbly cheap

Posted on Jul 20, 2010

  • Ter Xiong Jul 20, 2010

    I was able to get the screen to power up with another laptop.

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1 Answer

Toshiba m35x starts /stops intermittently with no power to display monitor


By whom Kathleen? You?

I ask because there are two ways to answer this;

1) You performed the procedure, and less for me to post.

2) You did not perform the procedure, and I need to explain from the beginning; using a diagnostic flowchart, pictorial guidance, and guidance from me.

While I wait for your reply, suggest perform this simple test first;
Laptop OFF, monitor OFF, attach an external monitor;

1) VGA monitor to RGB (VGA) port on left side of laptop.
Can use a CRT type of monitor (Looks like a small TV), or flat LCD screen monitor if it has a VGA cable.

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

OR;

2) S-Video port on left side of laptop for TV, or external video display device

http://en.wikipedia.org/wiki/S-Video

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. (Display device)

If not there are 3 display options available;
1) Internal monitor of laptop ONLY
2) Internal monitor of laptop AND external monitor
3) External monitor ONLY

Press, and hold the Fn key down, and at the SAME time 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.

Display on external monitor means there is a problem with;

A) Video Cable
B) screen Inverter
C) LCD screen

Which means if computer display was working correctly before;

1) Whoever repaired it could have used the external display option, and it needs to be set back to internal

2) The Video Cable connections are not tight, not correct.

Loose at motherboard, screen Inverter, or LCD screen.

3) Anti-Static Procedures were NOT followed, and laptop is now an expensive paperweight.

Post back in a Comment.

Regards,
joecoolvette

Apr 05, 2013 | Toshiba Computers & Internet

1 Answer

My acer aspire 9810 video died, can I use the vga port? so far no video out


You can switch to an external monitor or data projector by two methods. 1. Connect the external monitor to the laptop's video port, power up the external monitor first and the laptop. The video information will automatically switch to the external monitor. 2. If you power up the laptop first then you can switch the video output to the external monitor by pressing the Fn key and one of the Function keys, depending upon your make and model laptop. You can also toggle between the external monitor or both LCD screen plus the external monitor or back to LCD screen only by pressing the Fn key plus one of the function key a few times. Here is a list of key combinations for some of the laptops :- IBM ThinkPad = Fn + F7 HP and Compaq = Fn + F4 Toshiba = Fn + F5 Dell = Fn + F8

Mar 02, 2013 | Acer Aspire 9810-6829 Notebook

1 Answer

I have a Sony vaio PCG 5K7P, and it's not getting started...when I switch it on...only the fan works and the lights on wifi and the charger are working....no display on the screen and no processor


Laptop on, shine a flashlight at the LCD screen at various angles.
If you see a faint image the problem is the Backlight, or screen Inverter.

90 PERCENT OF THE TIME the fault can be attributed to a bad screen Inverter.
(IF the laptop uses a screen Inverter.
CCFL backlighting uses a screen Inverter.
LED backlighting may, or may Not use a screen Inverter)

No faint images?

See if the problem is the graphics chipset, or Video Cable, or inside the Display Assembly.

Graphics chipset:
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 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 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 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)
Still no display on external VGA monitor?
Hold the Fn key down again, and tap once more on the F8 key.

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

Most of the time the graphics chipset itself isn't the problem.
It is due to inadequate cooling for the graphics chipset, and this causes a problem with the MOUNTING, of the graphics chipset TO motherboard. (BGA surface mount)

If this is found to be the problem I will go into more detail.
I don't believe that is your problem, but there is NO guessing here.
We are following a diagnostic flowchart.

Good graphics on the external VGA monitor, means there is a problem with the Video Cable, or inside the Display Assembly.

A) Video Cable connections can be loose.
Connection at motherboard side, or connection of small cable to screen Inverter from Video Cable, (IF it uses a screen Inverter), or connection at back of LCD screen.

A LOT of times a loose connection can cause what you are seeing.

Video Cable could be damaged. Wires inside stretched/broken.

Inside the Display Assembly:
Video Cable checks out after a continuity test, then the screen Inverter is next in the diagnosis. (IF a screen Inverter is used)

Screen Inverter proves to be good, the problem is the LCD screen.
NO screen Inverter is used, the problem is the LCD screen.

Sony drives me crazy with their model numbering system.
What is the other model number on the bottom of the laptop?
Start with a VGN?
Post back in a Comment.

Once I have a model number I can deal with, I will post back with step by step info, and additional manual information.
(Service Manual. Perhaps pictorial guides, and video/s)

Regards,
joecoolvette

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

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

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

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

Jan 22, 2013 | Sony VAIO Computers & Internet

1 Answer

Laptop turns on but screen doesn't show


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.

May 07, 2012 | Acer 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

Compaq Presario CQ50-110US 15-inch Laptop dropped will boot but no video


Your laptop may have a combination of problems. Since the laptop was dropped, it is possible that your may a motherboard that no longer outputs video through the video controller, or the screen may have been damaged internally. Try hooking up an external monitor through the vga output of your laptop, usually located on the side or back of the laptop. If the external monitor works, then most likely it is your screen that's bad, if the external monitor doesn't works, then most likely it is your motherboard that's bad.


Let me know if this helps.

Feb 12, 2012 | HP Compaq Presario CQ50-110US Laptop

1 Answer

White horizontal lines running across laptop screen


I did not see any white lines, Simon, in the screenshot.
Just sayin'.
(Glad you tried to post it though!)

The problem is caused by a faulty Video Cable, or it's in the Display Assembly.

However, you better start the diagnoses with using an external VGA monitor, and see if the lines show up on the external monitor, also.
This would indicate a bad graphics chipset.

For most people that would mean replacing the motherboard.

A) Laptop OFF, monitor OFF, connect a VGA monitor to the VGA connector, on the Left side of the laptop.

Example of a VGA cable, and VGA port, (Connector),

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

You can use a external VGA monitor that is a CRT type, (Looks like a small TV), or a flat LCD screen monitor with a VGA cable.

A1) 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 monitor.
IF Not,

Press, and hold down on the Fn key, (Bottom left of Keyboard), and at the same time tap on the F5 key. (Top of Keyboard)
{The F5 key is the Display Toggle-Over key }

No?
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 F5 key.

Graphics look good on external VGA monitor?
Your graphics chipset is good.
Problem is Video Cable, or in the Display Assembly.

B) Video Cable: (LVDS Cable)

http://www.insidemylaptop.com/disassemble-acer-aspire-7551g-laptop/

The above is for an Acer Aspire 7751G, but it is close enough to the 7750G models, and info should directly crossover.

Scroll down to Step 17.
The Video Cable connection to the motherboard, is shown by the yellow arrow at the Top Left.

Note, although the photo is less than, the routing of the Video Cable.
It goes through the Left Hinge.
(Then into the Display Assembly, and connects to the back of the LCD screen)

With normal opening, and closing of the laptop, the Video Cable could be pinched, or have been pinched. Could have been pulled on.

You close the laptop, the cable is slightly pinched in the Hinge, and it pulls loose from the motherboard connection, AND/OR the LCD screen connection.

Doesn't take much of a loose connection. In fact it's hard to discern with the human eye, sometimes.
Make sure this motherboard connection is tight.

You have to open the Display Assembly, and check the Video Cable connection on the back of the LCD screen.

Doesn't look loose? Try to plug it in tighter anyway.

Check the connection of the wire/s from the Video Cable, TO the screen Inverter.
The small circuit board behind the Display Bezel, (LCD Bezel), and mounted to the bottom of the LCD screen.

When on the motherboard side, the side of the Video Cable that runs through the left Hinge, is there any apparent damage? Damage to the sheath of the Video Cable?

If there is, chances are the tiny wires inside the Video Cable, are damaged also.
Check with a multimeter. Perform a continuity test of Each wire.

C) Display Assembly:
Video Cable checks out then the problem is in the Display Assembly.

1) Screen Inverter:

http://www.sparepartswarehouse.com/Acer,Aspire-7700-thru-9800,Laptop,Inverters.aspx

http://www.insidemylaptop.com/replace-broken-screen-acer-aspire-5745g-laptop/

Not your model, granted. Posted for the Display Assembly dis-assembly pictorial guide.

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

A Backlight is a CCFL, or a series of LED lights.
Your laptop uses a series of LED lights for the Backlight.

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

A CCFL requires a screen Inverter.
A screen Inverter converts the power from the laptop, for the Backlight, and LCD screen.

NOT all LCD screens that use LED lights as a Backlight, use a screen Inverter. I suspect yours does not, as I can't find a listing for a screen Inverter, for it.

http://www.laptopscreen.com/English/section/FAQ/1245191276/Correct%20backlight%20type%20for%20your%20new%20screen/

This would mean that if the Video Cable proves to be good, the next step is to replace the LCD screen.

Shop around for the best price, AND make sure it is a direct replacement for yours.

Regards,
joecoolvette

Feb 12, 2012 | Dell Inspiron Computers & Internet

1 Answer

Video on my toshiba L455=s5009 comes on for a few seconds then blacks out


From your brief diagnoses stated, it sounds like a bad Video Cable.

The Video Cable routes from the motherboard, across one edge of the Fan Assembly, and under the left Hinge assembly,

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-Pro-L450-L455/big-body/laptop-disassembly-19.jpg

With just the usual opening, and closing of the laptop, the Video Cable's sheath may be damaged. This means the tiny wires inside the sheath may be damaged.
(Stretched/Broken)

http://www.irisvista.com/tech/laptops/Toshiba-Satellite-Pro-L450-L455/laptop-disassembly-1.htm

http://www.laptoprepairparts.com/html/details.asp?ref=1860&category=cables

Or it may be the screen Inverter that is damaged, or going out,

http://mcccomputers.com/shop/lcd-inverters/3666-new-toshiba-satellite-l455-s5009-l455-s5045-lcd-inverter-pk070006t20-k000087330.html

Or the LCD screen assembly.

Could be the graphics chipset.

Diagnose.

1) Laptop OFF, monitor OFF, connect an external VGA monitor to the laptop's VGA connector, on the back of the laptop.

[ RBG (Monitor) port ]

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

[ Example of a VGA cable, and a VGA port (Connector),

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

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

By default the external monitor should show the display, also.
IF not;
1) Press, and hold down on the Fn key, and simultaneously tap on the F5 key. (The F5 key is the Display toggle-over key)

Not showing on the external VGA monitor? Perform the above procedure again.
There are several display options.

External VGA monitor also show the same symptoms?
Bad graphics chipset. Replacing the motherboard is the most cost effective method, and easiest method.

External VGA monitor does Not show these symptoms?
Problem is the Video Cable, or screen Inverter, or LCD screen.

Due to movement of the LCD screen, which means movement of the Video Cable, my money is on a bad Video Cable.

(A Video Cable can be unplugged partially, real easy, on the back of the LCD screen.
It MAY look plugged in tightly, but may not be.

It can also be unplugged real easy when assembling the Display Assembly, to reinstall back on the laptop )

Check the Video Cable's wires with a multimeter. Perform a continuity check of all wires in the cable. (Multimeter set to Ohms)

Have an assistant also gently wiggle the cable, as you are testing. See if there is an intermittent break, due to a stretched/broken wire.

Or just buy a replacement Video Cable, and use it.

For additional questions please post in a Comment.

Regards,
joecoolvette

Feb 04, 2012 | Toshiba Satellite L455-S5009 laptop

2 Answers

How do i connect compaq presario x1000 to external monitor


Hi Judy,

The Compaq Presario x1000 notebook offers connections for external displays at the rear below the screen hinge as show in the picture below:

steve_con_5.gif

Identifying the back from left to right: Ventilation slots, External VGA Port, S-Video Port, USB Port, USB Port, RJ-45 Network Jack, RJ-11 Telephone Jack, Parallel Printer Port, USB Port and 1394 (a.k.a. "Firewire") Port.

You can connect a VGA monitor to the VGA port (blue colored jack) very easily. Any analog VGA monitor should readily connect to it. Additionally, the x1000 can output its display to TV or other monitor that accepts "S-Video" signals. An "S-Video" cable will be needed to connect between the "S-Video" jacks on the notebook (next to the VGA Port) and one on the TV. It is important to note that not all TVs support both or either "S-Video" or VGA inputs. When ever the there is a choice of using S-Video or VGA on a TV or monitor, the VGA will provide the best looking picture, and should be used.

I hope this helps and good luck! Please rate my reply - thanks.

Oct 03, 2011 | Compaq Presario X1000 Notebook

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