820-4924 Brain dead?

DaveDD

Member
Hi guys, we sold this mac 6 month ago to trusted client.
The machine was before used in our store for almost one year without issues. Never repaired before...

Anyway...
No post, No usb activity ,machine turns on , green and amber light , no fan spin but I assume that is normal on this model.
ALL_SYS_PWRGD drop to low once and then says high. Cpu get warm after a while.
Fan goes high speed on SMC bypass but nothing happens.

I checked all the SPI lines and all resistors and everything is OK.
Also tried a good bin file and another chip from same model of donor board.
No signs of liquid damage or whatsoever... Everything seems in good shape.

Any clues?
 

DaveDD

Member
PPVCC_S0_CPU=1,69v
PLT_RESET_L act same as ALL_SYS_PWRGD : 3,3v when i connect magsafe, drop to 0v after few seconds and gets and stays high at 3,3v.
 
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