screen not coming back(no backlight) after lid close/reopen

[hwangong]

Hi all,



I just replaced LCD screen from my old cracked one on my T61 7658-CTO.

There was no backlight, no indicator lights except WAN.



I tried another inverter, but same symptoms.

So, I tried another video cable, but same symptoms.

Then, I put the cracked one back in, but still same symptoms.

I can't figure out what's gone wrong.



I tried several other things and found out that

if I connect the video cable to the inverter in a half way from the left, then the screen works!



However, if I close the lid and open again, the screen doesn't come back.

And while screen works, if I power the laptop off and turn on again, the screen works fine.



So, I'm thinking there's something wrong with lid switch.

Correct me if I'm wrong.



I've seen a few people having same problem on this forum,

but nobody has an answer to this yet.



Could it be a damaged mobo or lid sensor? Or even some kind of fuse on mobo that people talk about?

Or maybe the inverters and vga cables I had are all damaged? I got them used off eBay.

But I tried several vga cables and two inverters.

It's really weird that lcd works perfectly with the inverter board only halfway connected to the vga cable.



If I push it fully for full connection, the screen goes dark; no backlight.

If I pull it out halfway from the right, then the screen come back and works very fine until I close the lid and open again.

Indicator LEDs never work except the WIFI one.




Please help me!