[SOLVED]820-3437 Smoking Joe Frazier Q7560

[Tony Tone]

A1466 came in stone dead. No PPBUS_G3H. Resistance to ground was near 0. So I injected 4.0V into G3H and see that Q7560 go hot. Changed it and only got 0.5V on G3H. Found F7140 was no good. Changed it and when I plugged in DC power Q7560 started to smoke. I see Q7560 does go to ground, so it is shorting to ground. When it was removed I did a continuity check on the pins with ground and none of them beeped. Like standing in a crossroad and saying DF?!

 

[dukefawks]

I bet 3v3_s5 got PPBUS on it so this board will be toasted. Remove Q7560 and check for a short on L7560. If shorted this board can go in the trash.

 

[Tony Tone]

No short there or on any pins on Q7560. I did change Q7560, Q7520, Q7130 & ISL. And Q7560 smokes again. (Parts came from a donor/s)

 

[Tony Tone]

So I changed U7501 & Q7560 and is working. I followed your advice in someone else's question. Thank you.