this board had liquid damage and wouldn't power up. It now powers up after a ultrasonic bath but i've discovered the +3vl rail is shorted directly to ground. now it doesn't power up with the battery but it stays on if you unplug the charger and the battery shows 100% and the percentage never drops
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Check the SMBUS lines on the battery connector. Measure the voltage to ground on each battery connector. -
the smbus is working because the battery detects but the capacity stays at 100%. the problem is the +3vL power rail which is shorted directly to groundComment
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Hello,
I have the same device and exactly the same problem. Do you have any new findings here? I have not yet been able to find an original circuit diagram or a board view.Comment
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Look for this IC on the board. Share pics if it is found.
https://ascnb1.ru/forma1/viewtopic.php?f=232&t=148836
Last edited by mon2; 07-12-2024, 06:12 AM.Comment
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Hi, Would appreciate some help.
I have an Apple Late 2013 15" A1398 MacBook Pro with Logic Board 820-3662.
Get charger light but no fan spin or chime. No liquid damage.
Found PPBUS and VCORE both shorted to ground. Other rails were ok.
Removed VCORE MOSFETS U7310, U7320 and U7330. Found U7330 was in fact shorted.
With the 3 MOSFETS removed, get PPBUS and fan spin. VCORE is still hard shorted to ground (0 ohms).
Attempted voltage insertion on VCORE to locate short using bench supply set at 1.0 VDC and 4.95 Amps (max current for my... -
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