820-00840 No Post

brunomotter

Member
Hello. Got this board here. It's on S0 state, trackpad clicks and CPU gets hot. It pulls 550mA from charger but no post. I tried first disconnecting screen as the internal flex was poked by someone who claimed to have fixed it(?!?!?!). Tried on external display without internal screen connected but no POST. As I was getting VCORE I tried to flash new known working BIOS to it, but still same result. Suspecting maybe bad CPU. Any ideas?
 

2informaticos

Administrator
Staff member
If the board was already worked in other service, you may waste time now.
There could be broken traces, knocked off components; even intentionally removed.

What is the exact CPU core voltage?
Did you check USB activity too?
 

2informaticos

Administrator
Staff member
Then board is stuck, not booting.
CPU core should drop to 0.6V, when board really boots.

PLT_RESET_L comes high?
 
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