Vizio VW37L TV - no 5v standby voltage

[Drail24]

Re: Vizio VW37L TV - no 5v standby voltage

The marking on the mosfet are:

H24
FQPF
3N80C

[dick_barton]

Re: Vizio VW37L TV - no 5v standby voltage

The layout is in the diagram attached. Set your meter to diode mode and there should only be one low diode reading between Drain & Soure. All other readings should be high to OL

[Drail24]

Re: Vizio VW37L TV - no 5v standby voltage

It will be later today before I can fully check the readouts as I am not currently at home, but from memory, it was the 2 outer legs that showed continuity... so the gate and the source.

When measuring from the gate to drain or drain to source, the readings were roughly .5 or 1.9, depending on probe orientation.

[Diah]

Re: Vizio VW37L TV - no 5v standby voltage

i would suggest you to go back to yours POST No. 5 D907 take it out from board and check it.

[CapLeaker]

Re: Vizio VW37L TV - no 5v standby voltage

Also check everything in between the Mosfet gate and the FA5531

[Drail24]

Re: Vizio VW37L TV - no 5v standby voltage

I did find a faulty Mosfet gate. However, I am unsure as to whether it was an integral component to the initial problem I was having or just another problem in general. That being said, after checking all the suggested components from the previous posts, I am still unable to get the 5v standby voltage.

Also, the voltage on pin 8 of the FA5531 is still bouncing from around 60v to 150v... even after replacing the IC and various resistors. In addition, the voltages on pin #2 and #3 of the IC are no longer yielding a stable voltage, if any at all (one of them switches between 0 and roughly 3v), as compared to before.

Any one have an idea of what may be the next items to look at?

Thanks