Lenovo V110-17ikb - Shorted CPU?

[Fr4gz0n3]

Hi everybody, I'm back with another laptop to repair, but this time I'm not so confident it can be fixed
It's a Lenovo V110-17ikb 17" with an i7.

I suspect a short on CPU but I would like your opinion.

This is the current status:
- the bios battery was completely dead (0V)
- without laptop battery the board draws about 150mA from the power supply.
- the 19V main power rail is working correctly
- +3VALW and +5VALW are present
- power button and BIOS receives the 3.3v
- When the PS is connected, the CPU warm up quite a bit in the area shown in the image (the PCH I guess)
- There are few caps with very low resistance (about 0.3ohm) to GND in the area near the coil PL1901: PC1912, PC1913, PC1914, PC1915
This coil operate on the +1.0VALW and there is no voltage.

Side note: someone can explain me why the heatsink has a hole right on the PCH?

[reformatt]

Re: Lenovo V110-17ikb - Shorted CPU?

PCH part of the CPU is likely shorted. PCH doesn't generate that much heat so they don't provide any thermal management for it.

[Fr4gz0n3]

Re: Lenovo V110-17ikb - Shorted CPU?

As I suspected... bummer. Thanks for the answer.

[mcplslg123]

Re: Lenovo V110-17ikb - Shorted CPU?

Thats the usual story with these SOC boards these days-Some killed by novice engineers,some by deign.

[Fr4gz0n3]

Re: Lenovo V110-17ikb - Shorted CPU?

Alas that's the sad truth

[ktmmotocross]

Re: Lenovo V110-17ikb - Shorted CPU?

sad intel truth. maybe 40-50% of my intel board problems is related to burned PCH

[rediii]

Re: Lenovo V110-17ikb - Shorted CPU?

sad intel truth. maybe 40-50% of my intel board problems is related to burned PCH

yes, absolute shitty