Vizio VP422 won't turn on.

[Malachi]

I just got this TV. When I plug it in a relay clicks, logo turns Amber and that's it.
I checked the voltages on the psu, and this is the only readings I'm getting.

5vsb=5.37
Ps_on=0.48
Ac_dect=5.18

That's it.

[dick_barton]

Re: Vizio VP422 won't turn on.

What's the full model number?

[Malachi]

Re: Vizio VP422 won't turn on.

Vp422hdtv10a.
I used the chassis as my ground. Is that ok?

[dick_barton]

Re: Vizio VP422 won't turn on.

Here's some information but not sure how useful it may be:-

[dick_barton]

Re: Vizio VP422 won't turn on.

Chassis as ground is fine. If you disconnect from the mainboard do you have all your DC supplies. If not connect 5Vsb to PS_On using 1K resistor and check supplies.

[Malachi]

Re: Vizio VP422 won't turn on.

Disconnected the 2 plugs that go to the mainboard.
PS_ON now reads 4.8v and the 3 D5V read 0.125v.

There is also a green led lit up on J8002.

[dick_barton]

Re: Vizio VP422 won't turn on.

Are there any other voltages that should be there that are not present?

[dick_barton]

Re: Vizio VP422 won't turn on.

Disconnected the 2 plugs that go to the mainboard.
PS_ON now reads 4.8v and the 3 D5V read 0.125v.

There is also a green led lit up on J8002.

Is the 4.8V on PS_ON present without the 1K resistor link?

[Malachi]

Re: Vizio VP422 won't turn on.

Is the 4.8V on PS_ON present without the 1K resistor link?

No, I didn't use a resistor. Not sure I have a 1k one and I don't know how to put it on there.
Can I slide I'd in the connector? Or solder it on with the connector unplugged or on the bottom side?

[Malachi]

Re: Vizio VP422 won't turn on.

Are there any other voltages that should be there that are not present?

That's it. I've measured everything labeled.

[Malachi]

Re: Vizio VP422 won't turn on.

Does this seem robe a mainboard problem or psu?
A mainboard that matches mine for a Samsung panel is $90 on eBay.
Another mainboard for the different panel version is around $30.

Would it work or are they specific.

[dick_barton]

Re: Vizio VP422 won't turn on.

Hello Malachi,
If you isolate the PSU and connect 5Vsb to PS_ON does D5V, Vamp, A12V come up?

[Malachi]

Re: Vizio VP422 won't turn on.

By isolate you mean disconnect it from all other boards?
How do I connect the two? Solder a wire on the back side of the psu?

[dick_barton]

Re: Vizio VP422 won't turn on.

That's one way to do it. I have small jumper leads that connect over the pins and I can push the resistor legs into the other end. Yes, isolate the PSU completely to check it.

[Malachi]

Re: Vizio VP422 won't turn on.

Hello Malachi,
If you isolate the PSU and connect 5Vsb to PS_ON does D5V, Vamp, A12V come up?

I think I have some connectors from me router serial recovery setup.
So use a 1k resistor also?
You post which I quoted doesn't mention the resistor.
Does it have to be 1k?

[dick_barton]

Re: Vizio VP422 won't turn on.

I think I have some connectors from me router serial recovery setup.
So use a 1k resistor also?
You post which I quoted doesn't mention the resistor.
Does it have to be 1k?

It's the size that's mentioned the most. I suppose any value around 1K would do. It's just to make certain you don't short circuit anything and limits the current.

[Malachi]

Re: Vizio VP422 won't turn on.

I had a 1k resistor and did what you said, no change.

[dick_barton]

Re: Vizio VP422 won't turn on.

So there's definately no change when you connect 5VSB to PS_ON.

What is the voltage across the large capacitors C8103 & C8104. Its on the hot side of the mains supply so be very careful. Use your meter set to 600V and measure across the two pins of each of the capacitors.

[dick_barton]

Re: Vizio VP422 won't turn on.

Have you checked both fuses on the board?

[budm]

Re: Vizio VP422 won't turn on.

Did you hear the two relays click when using the resistor to force on?
You also need command signals on the CN8002: VS_ON, RELAY_S???