bjf
Member
The computer was working fine and then one of the charging data lines was shorted by corrosion on the battery connector that a tech didn't notice. The battery actually worked for a while then failed. The ISL was damaged and shorted internally by it. The computer still worked but didn't recognize the battery anymore. I replaced the chip and now get around 5V on PPBUS. Magsafe is on. 3V42 line is fine. I tried another ISL chip with the same result. I've check all the pins. Everything is good. Both sets of current sense lines are measuring fine. I'm thoroughly baffled. Any ideas?