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820-3115-B Quarter fan spin, green light
- Thread starter Sr. Robot
- Start date
Did you try SMC bypass?
Above readings taken when the fan moves?
Check them for pulse at least.
Check them for pulse at least.
"It has quarter fan spin"
It requires 5V_S0.
So you should check ALL power rails for pulse; when fan spins.
It requires 5V_S0.
So you should check ALL power rails for pulse; when fan spins.
ALL_SYS_PWRGD pulsing at same time?
AVREF_SMC is good?
Also check all coils for pulse...
AVREF_SMC is good?
Also check all coils for pulse...
Check U7400, pins 46, 19, 29, 47, 1, 48.
Use surrounding components as test points.
Be sure R7402 are good and have no corroded trace/solder.
Use surrounding components as test points.
Be sure R7402 are good and have no corroded trace/solder.
Pin 1 should have same behavior as 48.
Replace R7403, just in case.
Replace R7403, just in case.
Try known good BIOS, clean ME.
Then you should have PCH, or CPU problems.
You can try heating them with quality flux; in case of accumulated crap underneath.
You can try heating them with quality flux; in case of accumulated crap underneath.