asus x5DAB no picture, where to start?

[ktmmotocross]

hello .
have this asus x5dab with ati nb and gpu. both r reflowed when it comes to me. i dont want to reballing if i must not. is there a way to check board just with nb? like discrete to uma.

[caspian]

Re: asus x5DAB no picture, where to start?

now I am working on a laptop with AMD NB, CPU and GPU. it is difficult to test. Does the NB get hot when you turn the laptop on? Is APU_RST high or low after turning on?
It would help if you find and attach schematics/boardview of this laptop. I did not find it.
please read my thread too:
https://www.badcaps.net/forum/showthread.php?t=73661

In addition, working on a mainboard on which somebody worked before, is risky. It is possible that the former repair technician f..ked the CPU, NB , and the other ICs as well.

[piernov]

Re: asus x5DAB no picture, where to start?

This laptop probably has an RS780M northbridge which does fail randomly. I'd start by replacing it if it was already fucked with. The laptop should at least power on (with fan spinning and power rails) even if the northbridge is dead, but it usually won't POST.
The GPU could be dead as well, can't tell for sure. Don't take my words for it, but I think it should at least POST without display if the northbridge is good and you remove GPU power.

[ktmmotocross]

Re: asus x5DAB no picture, where to start?

laptop starts, power rails are ok, just no post

[mielta]

Re: asus x5DAB no picture, where to start?

I use a cpu socket tester to test Northbridge often one light are off.
by this model 90% northbridge
https://www.ebay.de/itm/Desktop-CPU-...4AAOSw4A5Yw6HH

[ktmmotocross]

Re: asus x5DAB no picture, where to start?

how to use it on gpu?