820-00840-01 ALS dont work

ntcR

New member
Defective C7420 (burst) on PPBUS_G3H_CPU was exchanged.
During the test HWMonitor Mainboard shows 128 ° C (possibly no sensor?)

ALS does not work
The system hangs, windows close by themselves. PRAM reset (3x) and SMC reset do not help
Could use some help
 
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mbcontrol

Member
Hello 2informaticos, it's now me working on this machine (ntcR is a work colleague from me).

Disconnecting webcam means disconnecting the display (LVDS)?
Or is there another connector only for the cam?
The machine runs now for 1/2 hour without problems over ext. HDMI
 

2informaticos

Administrator
Staff member
The webcam connector is on T-CON, in the LCD assembly; the smallest connector.
Disconnecting LCD from MLB and using external monitor, also disconnects ALS...
 

mbcontrol

Member
ok, the machine runs now 1,5h without any problem. Before, the longest time was ca. 40 minutes.
What does that mean.
 

mbcontrol

Member
It's running now more than 4.5h without any problem - with only webcam disconnected from T-CON.
 
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mbcontrol

Member
Yes of course, mistake in my thinking. btw the machine is running without problems. Many thanks for your help - great.

Only for better understanding - can you explain to me what happens with such an ALS error? Is the Sensor talking bullshit on the I2C? Why is the machine randomly crashing? (Only if you have a bit time left)
 

2informaticos

Administrator
Staff member
Somehow, ALS screws the I2C bus communication.
And SMC cannot read the other sensors connected to an interface from the same bus.
 
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