A1286 820-2915-A no boot

[hgoncalves]

Hi,
I have an A1286 820-2915-A that doesn't boot.
It has green light, fan spin, consumes 1.200A w/o battery connected, CPU gets hot, but doesn't power on.

Shall I disable GPU?

All big coils have voltages, except L7550, that has 0V.

Diode reading on L7550 = 0.010

Can you help?

 

[2informaticos]

L7510 final voltage?
PLT_RESET_L comes high?

So easy to disable GPU on this board; consider it as must check option.

 

[hgoncalves]

L7510:
PPVCORE_S0_CPU_PH1 = 1.160V

PPVCORE_S0_CPU_PH1_L = 1.269V

PLT_RESET_L = 3.346V

I've disabled GPU with medusa, removed R8904, but same result.

 

[2informaticos]

VCORE should drop to 0.75V when board boots.
Tried different RAM modules?
Do you have DDR3 test card for slots?

Did you remove R8904 before aplying power to the board?
If not, do BIOS mod again.

 

[hgoncalves]

You're write.
It was a mix of RAM and GPU failure.
Tks.