Alienware 15 R2 LA-C912P no CPU power

[REpairAT]

Hi,
Device is Alienware 15 R2
MB: AAO21 LA-C912P Rev: 1.0(A00)

Computer beeps 7 times, meaning "CPU failure". CPU stays cold, gets no power at all. No CPU short, resistance around 4Ohms. GPU voltage seems to be ok. Gate driver on top of coils are SIC632 but I have no experience testing them. Attached the picture with measured voltages, I appreciate any form of help.

Thanks a lot!

[mcplslg123]

Re: Alienware 15 R2 LA-C912P no CPU power

Check Ram requirements are fulfilled or not?? Consumption on dc supply 01.With RAm 02.Without Ram. I'm assuming ram is not onboard.

[REpairAT]

Re: Alienware 15 R2 LA-C912P no CPU power

Thanks, checked different modules, all should be in spec. Power consumption stays the same with or without RAM, around ~700mA. Memory voltage 1.2V is present on each module.

[JaroTech]

Re: Alienware 15 R2 LA-C912P no CPU power

Hi, what voltage do you have on both sides of PL500?

[mcplslg123]

Re: Alienware 15 R2 LA-C912P no CPU power

Power consumption stays same with ram /without ram-this means system is not reading ram. So you have to check voltage on ram slot pins.

If ram is DDR3-PC3-L
Pin75/76//1/203/204/126/199/200/202/30

IF DDR4
Pin 12/33/75/258//164/254/255/253/108

[mcplslg123]

Re: Alienware 15 R2 LA-C912P no CPU power

Flash clean me bios if not flashed yet.

[REpairAT]

Re: Alienware 15 R2 LA-C912P no CPU power

Hi, what voltage do you have on both sides of PL500?

Hi,
PL500 is before PC542, so 19.45V

[REpairAT]

Re: Alienware 15 R2 LA-C912P no CPU power

Flash clean me bios if not flashed yet.

Cleaned ME, no changes...