Q4260 Mosfet burned on mainboard
Hi, the Q4260 (NDS9407) has burned. I changed it, but it burned again. So, I identified a short on the circuit connected to the drain of Q4260. I don't find the other bad component, because I need the eletrical diagram to do this.
Do you have the esquematic diagram of mainboard?
Thanks
Is this a good question?
3 Comments
what are the last three digits of your serial number? That way we could identify your motherboard a bit better.
by oldturkey03
Fabiano,
Did you found a way to repair your Mac? I have exactly the same problem than you.
by igor
Same board 820-2610A same issue...
Replaced all the surrounding components, same result. The mosfet doesn't apparently have any side shorted to ground but when I give power to the board that component burns out. Only removing the sensing resistor allowed me to sit the component and get some measurements...
I get 8.4v on pins 123 3.4v on pin 4 and 8.4v on pin 5678.
Whanever i sit back R7790 the mosfet say bye bye...
by Luigi Mazzoli