820-3535 Finstack fault TH1H

grmacs

Member
No liquid ingress known. Fans run high. ASD shows TH1H below limit but when I check FINSTACKSNS_ALERT_L, it always reads 3.3V with or without the IO cable connected. I've tried 3 different IO cables and IO boards. DIode reading at pin 21 J9500 = .53. Replaced the SMC twice and checked for continuity from R5172 to corresponding pad 123 under SMC. I get 3v3 at TP SMC SENSOR ALERT. I'm at a loss as to what is causing this fault.
 

2informaticos

Administrator
Staff member
A signal like ALERT_L is good to have it high; problem appears if low.
Mentioned signal is active low, remember.

Is that the only error which appers on ASD?
 

grmacs

Member
right. Thats why I thought it was SMC. Could this be PCH issue? Yes that is the only error. I've run ASD probably 5 times and Finstack TH1H is only error.
 

2informaticos

Administrator
Staff member
Did you set continue, instead of stop on first error?

Good trackpad must be connected, as LIO board too.
If not, fan spins to max and error comes up too.

Did you try disconnecting webcam?
 

grmacs

Member
SOLVEd. Thanks for your help. Had a very high diode reading on pin 1 of R5370 so it was not getting PP3V3_S3. Jumpered that and all is well!
 
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