Bad LCD cable or what?

Hello guys,

I have an Acer Aspire 7720G laptop with Nvidia GeForce 8400m GS graphics . Suddenly a white horizontal line appeared in the middle of the screen. Above and under the line there's the boot up screen, later on the Windows login screen. Two full images, slightly pushed to the left. Like the screen is shared for 2 players.
I tested the screen with another laptop, it was working fine. Also with an external monitor it was OK.
What confuses me is that it's divided in BIOS as well.


What can be the problem? LCD cable, graphics? Any ideas?

Thanks,
Kolja

 

Welcome to the forum!

I'd tend to say that the culprit is your GPU.

There are two outputs from it, one digital (LCD) and one analog (VGA). One can be completely shot while the other is still standing.

Good luck.

 

at first i would tend to agree with ajkula66 until you say it works fine on an external monitor.
now this is strange. lines and off centre screen normally points towards a dying gpu especially as yours are 4-5 years old.
can you post a screen shot of the screen as this would help a lot.

check my screenshot on this thread. is yours anything like that? http://forum.notebookreview.com/gam...-cards/727955-screen-reverse-split-lines.html

 

Thank you for the replies.

This is how it looks:


Apart from line in the middle I don't see any other ones.

Clooser looking at the external monitor it flickers a bit.

Thanks
Kolja

 

If I'm not mistaken, your GPU is one of nVidia chips affected by the (in)famous failure from six years ago, which hit everyone and anyone from Apple to Dell to HP to Lenovo...

I have zero knowledge of the particular Asus' structure, but:

a) If the GPU is soldered to the board, you need a new board or

b) If the GPU is swappable, it must be swapped.

Good luck.

 

Yes, the 8000 series is the one plagued by issues due to bad solder. Either way, if you replace the mobo or the GPU (likely has to be the mobo for the OP), the new GPU will still suffer from the same issue and eventually fail.

 

Agreed that the Nvidia GPU is the culprit. What happens is the solder cracks and kills connections on the circuit board. This is why the 'oven baking' method can work - the heat can fix the cracked solder. It's not something I have seen done with an entire motherboard though; notebook graphics cards are typically part of the motherboard and not removable by themselves.

If you're serious about fixing it, look on eBay for your notebook - see if someone is selling one for parts (a non-functional notebook that still has working parts). That would probably be the least expensive route. Personally I'd say a notebook that old isn't worth fixing.

 

the 8xxx were bad but the rebranded 9800GT were worse

in my post above ive posted the links to the oven baking method which is done at owners risk.
looks like the OP now says his gpu is totally dead.

 

I've baked few laptop motherboards, succesfully even.
Last time I had few Quadros in the oven...

Spoiler

Couple didn't work but at least two of them are now in use, one in my own work computer Nice upgrade from PCIE x1 GF7300 it had previously... couldn't run fullscreen video even, too laggy.

Problem isn't just 8000 series GPU but pretty much the whole manufacturing process from the 7000 to 9000 series was bad, including motherboard chipsets (used in AMD powered computers, both laptop and desktop) from the same era. That was the reason for some dv6000 series that had WLAN problems or losing hard drives.

 

Thank you guys for all your comments and advices, I really appreciate them.
I think i'm going to reflow the board (not in the oven) and see what happens.

Thanks again,

Kolja

 

Hi Kolja, I am also facing the same problem as you shown in your screenshot/image with my acer. Can you please let me know had you fixed the problem. If yes then what's the problem was? Is it LCD problem or problem in GPU. Actually I asked some repair person and he told me i need to replace the LCD that cost me around $80 . Please bro mail me how you fixed your laptop and what was the main problem.

 

hi
dont expect a reply as that post is 10 months old and he hasnt posted since.

they come, they get what they want, and then they bugger off again

start a new post with all your details and someone will be able to help.