How to troubleshoot dead power brick

[stj]

32ohm between gate and source.
lets see, source voltage is 170v
max gate voltage on most mosfets is 30v
chip is bad and mosfet is in question and where is the 10k coming from?

[CapLeaker]

mmartell
that sounds to me the OB2269 is fubar. Even so the pads measure up without the chip, recheck the whole gate drive and the mosfet. Usually the mosfet fails and dumps high voltage to the gate drive. But sometimes the IC fails and everything else is o.k. Not sure where the 10k come from either.
Kinda on the rare scale, but seen it before.

[mmartell]

See pic - R5 is a 10k resistor between Gate and Source that's where it's coming from. I also measure 13.6 ohms between pins 6 and 8 on the power ic itself now that it's out of circuit.

Not sure how to test the mosfet it's not shorted in any way at rest but could be open I guess ? Reads as a transistor from D to S with my meter but that's all I get out of it.

Can this power ic be substituted with something more common ?

[CapLeaker]

The OB2269AP is actually quite common. Even LCSC and many others have it, just not Mouser or Digi.
Pin 6 is the sense pin and pin 8 is the gate pin. That’s why I am saying check out the whole gate drive circuit!