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820-3462 - No green light.

gcain

gcain

New member
Came in with a significant coffee spill around U6990.

Gave it an ultrasonic clean as it was still sticky.

R6920 and R6905 were burnt out. Replaced them, got green light but n fan spin. A few minutes later R6920 burnt out. Replaced it again and looked around for a short on the G3H lines but couldn't find anything.

Now I get no green light but R6920 and R6905 measure correct. But the voltage on R6905 is somewhere around 0.7v and always moving. Diode mode on R6905 is about 0.130.


ppbus_g3h = 8.20 - 8.50.
pp3v42_g3h = 2.66 - moving


Edit: Any idea why the battery interface was designed the way it was for this model? Seems overly complicated for almost zero benefit.
 
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gcain

gcain

New member
Thought about what you said; I so removed and re-replaced U6990 and BOOM!

We got fan spin! :)




Edit: After a couple reboots the battery showed 100% then 0 then an X. :(

Runs of battery just won't start off it or see it.
 
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gcain

gcain

New member
pin 2 of R5280 is 0.474
pin 2 of R5281 is 0.572

Reseated everything; and now I get displayed 0% with no adapter and 100% with the adapter. Then after a minute or so it shows like a service battery icon.

But it runs off the battery fine.
 
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gcain

gcain

New member
Re measuring this morning I get;

pin 2 of R5280 is 0.474
pin 2 of R5281 is 0.477

Could it be heat related. It seems I can get 0% and 100% then eventually I get no battery.
 
gcain

gcain

New member
Customer took the laptop without a battery as they needed it for work.

Has come back now as it won't boot and the fans run high.

ASD EFI Reports;

SMC IO failed:
TA0P - Ambient Air Sensor,
TA1P - DC-IN Proximity Airflow,
TC0P - CPU Proximity,
TM0P - DDR3 Proximity and
TW0P - AirPort Proximity.
 
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