820-3437 fan going nuts

gadgetfix

New member
now voltages are present on u5110 but no fan spin no boot. i was probing around on u7100. i might of accidentally bridged pin 12-11? could this be the cause?
 

gadgetfix

New member
i got 3.4v on ppbus now? I also notice R7122/R7121 is both dead and there is big hole in R7105 i replace and it burnt again!?
 
Last edited:

2informaticos

Administrator
Staff member
Why didn't think you why R7105 got burnt???
I bet U7100 is fried.
Check C7105, just in case.
Also check Q7130 before power up the board again.
 

gadgetfix

New member
ok got booting again everything is good. replaced isl and resistors that were blown. good news is the u5110 has pp3v42_g3h coming in now and also its shooting out 3.3v from pin 8
i will wash and retest board in machine? is it normal that out side machine board only with charger only and NOTHING connected - the fans run 100%?
 

2informaticos

Administrator
Staff member
Fan will go high if trackpad is not connected.
Palm rest temperature sensor is not detected.
Run ASD again, if needed...
 
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