Vizio E320AR

[Syryll]

Hello!

I've got a Vizio 32" that does absolutely nothing. Orange standby light doesn't even come on. I took it apart and checked for +5v at the power supply connector to no avail. The 82uF 450v reads 362v if that helps at all. I'd like to know where to proceed from here.

Thanks!

[budm]

Re: Vizio E320AR

OK, I do not see 5V label for the connector of the power supply board going to the main board.
There is 3.3V pin which is stand by Voltage and the PS-ON pin next to it, you must be getting the 3.3V and the PS-ON signal form the main board otherwise you will not have PFC Voltage of 362VDC on the two legs of the main filter cap.
We need to see the whole back side of the TV.

[Syryll]

Re: Vizio E320AR

Yup, getting 3.28v at the 3.3v leg.

[budm]

Re: Vizio E320AR

Good, the standby power supply is working.
What do you have on the PS-ON pin?
I think you have main board problem.

[Syryll]

Re: Vizio E320AR

What do you have on the PS-ON pin?

PS-ON seems to be rising to about .4v and then falling to 0 over and over again.

[budm]

Re: Vizio E320AR

PS-ON seems to be rising to about .4v and then falling to 0 over and over again.

OK, that does not make sense because you do have 362VDC on the main cap, to have that Voltage, the PS-ON mus be present.
At this point we do know that you do have main board problem.

[Syryll]

Re: Vizio E320AR

OK, that does not make sense because you do have 362VDC on the main cap, to have that Voltage, the PS-ON mus be present.
At this point we do know that you do have main board problem.

Well before I go purchasing a main board, is there a way for me to bench test the supply/inverters and make sure the backlight works?

[budm]

Re: Vizio E320AR

Yes you can.
First you have to disconnect the cable between the main board and the power supply board, then connect 100~330 Ohm 1/4W resistor between PS-ON pin and the 3.3V pin, the second 100~330 Ohm 1/4W resistor between ON/OFF pin and 3.3V pin.
Plug the TV into the outlet then you should see the backlights come on and stay on.

[Syryll]

Re: Vizio E320AR

Yes you can.
First you have to disconnect the cable between the main board and the power supply board, then connect 100~330 Ohm 1/4W resistor between PS-ON pin and the 3.3V pin, the second 100~330 Ohm 1/4W resistor between ON/OFF pin and 3.3V pin.
Plug the TV into the outlet then you should see the backlights come on and stay on.

Alright. Thanks for your help Bud!