820-00165 PP3V3_S4 shorted

2informaticos

Administrator
Staff member
Check all SPI Bus Termination resistors and their traces.
Be sure J6100 is clean.
Also check for pulse page 58 outputs.
 

Instafixx

Member
All SPI Bus Termination Resistors are have diode value in the range of .500s.

J6100 is 100% clean.

Page 58 Output Rails - You want me to check pulse when SMC_ONOFF_L is triggered ?
 

2informaticos

Administrator
Staff member
"diode value"
I didn't ask that; check if all resistors have their correct ohm value!
Also check their traces for continuity; some of them are under PCH.

Check page 58 for pulse and diode mode...
 

Instafixx

Member
All ohms value look okay. Traces too as far as i could check.

I checked these rails and all are pulsing when SMC_ONOFF_L is triggered.
pp1v5_s0sw_audio
pp3v3_s4_fet_r
pp3v3_s3_fet_r
pp3v3_s0_fet_r
pp3v3_s4sw_sns_fet_r
pp5v_s0_fet_r
 

2informaticos

Administrator
Staff member
If known good BIOS doesn't help, you may have PCH/CPU problems.
You can try heating it with quality flux, to burn eventually accumulated crap.

First check for pulse all power rails from page 11.
May have a broken coil, or damaged 0 ohm resistor.

 
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