820-00923 left fan spinning full

[TBFix]

No visible sign of spillage. I ran hw monitor and only airport proximity sensor reading high. Diagnostics only says problem with fan. I tried 2 different chassis and both the same.
Any ideas welcome.

 

[2informaticos]

Inspect Q6000 area.
Compare readings with Q6050.

 

[TBFix]

HI thanks for the reply. I found a resistor missing R6001 so replaced it but fan still running full. I also noticed that the webcam turns on but black screen. Would this cause the fan to run high?.

 

[2informaticos]

Disconnect internal LCD and test with external monitor.
ALS issue can make the fan spins fast.

 

[TBFix]

I disconnected the internal lcd and hooked it up to external monitor but fan still runs fast.

 

[2informaticos]

May have other damaged component, or broken trace.
Compare readings between Q6000/50 fan channels.
Try swapping both transistors.

 

[TBFix]

HI I swapped over both Q6000/50 and fan stopped spinning fast . Must have been a bad connection on Q6050. Many thanks for your help.