Vizio D50u-D1 Dead: PSU or Main Board?

[fharris1977]

Hi. Anyone who has experience with these vizio sets, which pin on this connector is the standby, the 5V pin? Trying to rule out the PSU before ordering a mainboard. I'm getting 0 Volts on all pins on this connector. Trying to jump the standby and PS ON pins to see if the PSU is functioning. Thanks in advance.

[EazyBone]

Did you check the fuse on PSU? Unplug PSU to main board plug and check voltages. But fuse first obviously

[fharris1977]

Yeah fuse is good. No voltage on any pins on PSU connector unplugged from mainboard.

[vinceroger69]

Check the voltage "across" one of the main filter caps in the primary (C9803,04 or 05) If you have +160vdc

[EazyBone]

I mean, it appears you have a PSU malfunction. You definitely should have voltages. So now you know. Are you trying to diagnose the PSU to fix it? Or just order one.

definitely test the main filter caps, check the octocoupler voltage also

[lotas]

And also check the diode at the standby voltage output for a short circuit.