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820-00165 low voltage No lights on charger.

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Allstartek

Member
Hello. I am working on a MBA 829-00165 and as I check the power rails I only get a 4.1 volts at R5450 Shouldn't this be 8.6 volts?

My problem is that I have no lights on the charger. It seems like I have PP3v42_G3H
 
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dukefawks

Administrator
It seems like you have 3V42? It seems to me you need to make sure before anything else. Also inspect ISL6259 area for corrosion.
 
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Allstartek

Member
This board is actually very clean. no signs of liquid damage at all.

I have 3.42v everywhere along the rail. U1950 pin 8, U1900 pin 13m U3740 pin1, U4650 pin 9, C4820 pin1, L5001 pin1, R5127, U5110 pin 3 and 1, L7095, R8141 pin 1,
When I get to C7095 I have 3.45V on pin 1 but only 1.3V on pin 2
 
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Allstartek

Member
checking the PPBUS_G3H rail. At the fuse F7140. I have 8,3v on pin 1 and 1.9v on pin 2. This doesn't make sense since I can't see a direct short.
 
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dukefawks

Administrator
8.3V is too low and it seems like F7140 is blown? SMC is not running. Check SMC_RESET and SMC_ONOFF. Corrosion under SMC?
 
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Allstartek

Member
Hmm. I replied Sunday morning but For whatever reason it didnt post.
SMC_RESET checked R2072 pin 2 0v
R5170 pin 1 3.4v
r7100 pin 1 3.3v
PP3V42_G3H C5003 pin 1 3.4v C5009 pin 1 3.4v

SMC_BIL_BUTTON_L R5181 pin 1 3.42v
 
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