Screen Problem When Screwed In

[gmattey]

Hi there,

I have a compaq presario 2500 and i'm currently replacing the screen.

The screen works fine when just led down on a surface but as soon as i put it anywhere near the hinges or try screwing it in i get this blue maze all over the screen.

Anybody know what causes it?

thanks

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[acewarlock]

Sounds like the ribbon cable is moving around.




This is a Signature and not part of the answer, it appears on every reply.

This is an Analogy so don't take it personally as some have.

Why change the engine if all you need is to change the spark plugs.

 

[gmattey]

the ribbon cable is securely in place.

i did get it working and put together, wasnt long before the blue patterns appeared again.

i mean the screen works when not screwed in, is it something to do with static in the screen or a poorly made screen?

thanks

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[wahnula]

Something's probably applying pressure and warping the screen when you screw it down. Look carefully to make sure that nothing is sticking out where it shouldn't be.

Tony

Users helping Users...

 

[gmattey]

i managed to get it sorted for roughly a day, then it wen back to normal.

i think it's either the lcd cable or inverter.

i'd imagine a dodgy lcd cable but what does everyone think?

thanks!

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[wahnula]

How long have you run it open (without screwing down)? Long enough for the symptoms to appear?

Tony

Users helping Users...

 

[gmattey]

well when it's not screwed down the screen is fine.

when ever i stick the hinges next to eachother the screen gets patterns on it.

it's like the screen is affected by some sort of static.

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[acewarlock]

Are you sure it's not magnatisim causing it?




This is a Signature and not part of the answer, it appears on every reply.

This is an Analogy so don't take it personally as some have.

Why change the engine if all you need is to change the spark plugs.

 

[gmattey]

probably something like that but no idea how to fix it!

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[wahnula]

I would check all the grounding. Use alligator clip jumpers and connect the hinges and the LCD ground to known good ground. There's a possibility (slim) that your screen gets its ground through the hinges, or there's a ground loop.

Question: Can you assemble the LCD shell completely (without attaching to hinges) and get the screen to work?

Tony

Users helping Users...

 

[gmattey]

Oh right i see, could be yes.

I've never really tried fitting the screen without the hinges on to be honest but it's something to do with the metal on the hinges and the laptop hinges the screen doesnt like as it's fine without it.

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[wahnula]

Another thought would be to take a DC voltage reading between the laptop ground and the screen ground (screen physically removed from laptop, except for wiring harness). This would indicate if there was a problem with the wiring, letting voltage leak to ground.

Tony

Users helping Users...

 

[gmattey]

I don't have any tools like that though.

I've given her the laptop back as it is, she didnt mind as it was a lot better than before.

I was wondering about lcd cables though, i've seen them on the internet and they have different numbers e.g. C297.

Would it make any difference what model number it is as they're all for compaq presario 2500 with same connectors.

Thanks.

Asus P5K Motherboard
Intel Core 2 Duo E6850 3.0GHz
4GB DDR2 667 MHz
320GB Sata Hard Drive
Nvidia 8500GT Super 512MB

 

[kjv1611]

I don't have any tools like that though.

Ya got a finger, don't ya?

Please, understand, this is entirely mean in pure sarcasm!

'Course, using those wood screws probably didn't help any.
[LOL]

--

"If to err is human, then I must be some kind of human!" -Me

 

[wahnula]

Ya got a finger, don't ya?

Laughed out loud on that one...

Reminds me of a past visit to Peru, on the beach where teenagers were testing a car's ignition system...by cranking it and holding on to the ignition wire! YOW!

Tony

Users helping Users...

 

[kjv1611]

Well, at least you'll KNOW whether or not it works that way!
[ROFL]

I mean, there'd be no doubting whether it worked or not.

Why, at our church, we had a guy for a while who tested all the 9 volt batteries with his tongue. For sanitary reasons as well as his health, I got us a bonafide battery tester from Radio Shack!
[ROFL]

So, gmattey, the lesson learned is:
Never say you don't have the tool for the job. Of course you have a tool you can use!

This little piggy went to the market..
This little piggy stayed home..
This little piggy went wee wee wee wee wee all the way home (that is, after testing for a wiring problem in his laptop).
[LOL]

--

"If to err is human, then I must be some kind of human!" -Me

 

[wahnula]

And, on a more technical note, a multi-meter is a cheap investment that you will use time and again to test batteries, continuity, and lots of other things. They are cheap, too, I got my wallet-style mini-meter for about $20.

Tony

Users helping Users...

 

[kjv1611]

I've got one I got dirt cheap at Radio Shack, myself. My only problem? I ain't got the slightest as to where I put the thing! [LOL]

--

"If to err is human, then I must be some kind of human!" -Me