820-3478, Fan spins no chime Black screen

donnos

Member
i have a 820-3478 which Fan spins but don't chime and only black screen
first 2 LED lights up,
CPU Vcore 1.7V
GPU Vcore 0.8V
PLT_RST_L 3.3V
no shorts detected

is this GPU issue? resistance on gpu core is 20ohms same goes to CPU as well.
 

2informaticos

Administrator
Staff member
Any history available?
Did you try SMC reset?
Can also test disconnecting CMOS cell.

Try known good BIOS, before GPU reflow (for test).
 

donnos

Member
no history other than it just suddenly died.
yes tried SMC reset as well.
i thought PLT_RST_L signal indicates that BIOS loadout is complete and CPU is talking to EFI? anyway i will try finding for the a clean BIOS first
 
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