Lenovo IdeaPad 310-15IKB gpu short circuit.

[Francisco.s]

Hi, have a weird issue in a Lenovo IdeaPad 310-15IKB NM-A981.

There is a short circuit at the output of PU701.

This chip regulates the +1.05VSP_VGA, this voltage passes the jumper PJ702 and renames to +1.05VGS.

Removing PJ702, the short is now only in +1.05VGS.

Seems that +1.05VGS is part of gpu power supply, and gpu is shorted to gnd.

The weird thing is that removing PJ702 the laptop boots an have image on lcd screen, but when it boots from its hdd, shows a blue screen and shutdown.

Only if boot a ms-dos disk, like memtest, it ends its job without any problem.

It doesn't boot any linux distro.

Is there any chance to convert this motherboard to uma?

Thanks.

[Francisco.s]

Re: Lenovo IdeaPad 310-15IKB gpu short circuit.

Is there any chance to convert this motherboard to uma?

I tried with BOARD_ID3 and swap RC1610 and 1609 places, but without success.

[ktmmotocross]

Re: Lenovo IdeaPad 310-15IKB gpu short circuit.

try to just remove GPU power coils. if not help. try to remove power mofets/HIGHSIDE will be enought/ so controller ic wwill not give PGOOD signal

[Francisco.s]

Re: Lenovo IdeaPad 310-15IKB gpu short circuit.

try to just remove GPU power coils.

Thanks for your replay.

PL801 and PL802 Have been removed, but seems not to be enough.

I have also tried with BOARD_ID3 strap resistor as mention above but it's the same as before.

Also tried to change to force uma only in bios setup and same result.

In fact, it is already working in uma mode, but only works with 16 bits programs in pure ms-dos.

Seems that the +1.05VSP_VGA are needed in some esencial circuit.

[tomodachi]

Re: Lenovo IdeaPad 310-15IKB gpu short circuit.

Exact same issue here with skylake cpu version.
Gonna try to remove GPU and will let you know results