820-01521 20v, no boot

[2informaticos]

Very likely damaged T2, because of leakage from audio board; PPBUS_G3H to data lines.
Check diode mode at J6100; on the data pins nearest to PPBUS_G3H.

Tried forcing SOC_FORCE_DFU to 1V8_SLPS2R, not AWAKE?

 

[2informaticos]

What voltage did you inject?
You should get sufficient current to heat something, having almost pure short there.
Don't forget to set amp limit to max on your lab PSU.
BTW, 5A PSU may be insufficient for this case...

 

[captainmac]

Jesus.. im sorry, my bench-mat was still hot from work i did earlier, so the heat around U2800 was coming from that.
I was using shit-wires before, changed those, I injected about 2.8v maximum, it was taking about 1A and only the PCH-side of the CPU is getting hot..

 

[2informaticos]

2.8V into less than 1 ohm (reported 0.4 ohm) should get near 3A there.
If PCH gets hot with 1A, is enough to point as dead PCH however.

 

[captainmac]

Yeah I’m pretty sure my resistance measurement was correct and was surprised it took that high voltage to get to about 1amps..
My psu might not be very accurate.

damn I don’t like no-fixes