820-00165-02 dead

[tech]

All volt voltages after power button just pulsing.
g3h bus = 8v constant
pp3v3 s5 = 3.3v constant

5v s4 = goes to 5 then drops
s3 voltages same
s0 same
v core =jumbs to 1.7 and drops
all these voltages just comes for seconds of time
also PLT RST comes 3.3v and drops

 

[2informaticos]

Do you get 1 or 2 pulsing voltages?
Maybe power cycling every few seconds?

"g3h bus = 8v constant"
Me and many more on the forum don't believe this.
PLEASE, post accurate information; 1 decimal digit is good enough.

Any history available?
Tried SMC bypass mode?

 

[tech]

yes only for 2 times
first voltages comes and drops after a few second again comes and drops after that nothing

tried smc bypass no rsult
pubs s5 =8.5 volt present

no water damage no corrosion found

 

[2informaticos]

Two pulses is the worst scenario.
I revived one board after heating PCH/CPU with quality flux; accumullated crap underneath can be a cause.

Be sure all volatges from page 11 are present.
Check all SPI Bus Series Termination resistors and their traces.
Also check the LPC bus resistors.