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820-2936 board works fine for a week or so and then blows the ISL6259 chip

bjf

bjf

Member
I've repaired this board 4 times now and it keeps blowing the ISL chip every week or so. The PPBUS_G3H line then goes to around 4.5V. Has anyone seen this type of thing before? The only diode measurement that's off is on pin 25 CHGR_BOOT. It's at .454. I usually see something in the range of .585 on that pin. That's with the blown chip still installed.
 
bjf

bjf

Member
Thanks for the tip. I had a similar thought. This was in a computer that was sold and came back. I replaced the ISL, installed a different battery, swapped the charger and returned it to the customer. It blew again. I pulled the board, repaired it and put it in an entirely different computer and it still blew it in the same way. Not sure what to think. I just replaced the ISL and it starts right up again.
 
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