[Vizio XVT3D554SV] Orange logo, won't power on

[budm]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

The section with sign of over heating is for the LED Backlights power supply.
http://www.shopjimmy.com/catalogsear...zio+XVT3D554SV
Boards for this TV are not cheap..
You can try forcing on the power supply board, you can also try disconnecting the WIFI board to see if the main board will send out the PS-ON, or it can be that the main board did send out the PS-ON but there is failure in the power supply board so the power supply board sends error signal to tell the main board to turn off PS-ON signal. You may want to put the meter on PS-ON pin and turn on the TV to see if the PS-ON even jump up >2VDC and then drops down to 0V or not.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Yes ShopJimmy doesn't stock the boards anymore so they need to be repaired or purchased used. Power boards are available used/refurbished on eBay for ~$90 and main boards can be repaired for $120 + shipping through eBay.

I tested pin 13 just like you described. I used an alligator clip for ground, held my positive probe on pin 13, and pushed the power button. The voltage never changed.

How would I go about triggering the PS-ON manually? That seems like the simplest way to test if the issue is the power board failing or main board not sending signals.

[budm]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

You will need to remove connector that goes back to the main board first and then use 470~1000 Ohms (1/4W will be fine) between 5VSTBY and pin 13 to force on the power supply.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

So I would need a resistor to jump pin 1 (or 2,3,4) and pin 13?

Sorry - I don't have much electronics experience. I can solder and do simple testing but more advanced work is beyond me without instructions.

[budm]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Just solder one leg of the resistor to pin 1 (or 2, 3, 4), then another end to pin 13, you have to make sure the cable is not connected back to the main board.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Okay that's what I figured. I'll have to go to my local Radioshack for some resistors before they shut down.

I really appreciate the help.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Success, I think. I soldered a 470 ohm 1/4 watt resistor between pin 3 and pin 13. I plugged in the power cord and I can hear the PSU buzzing. I have everything plugged except main board. The screen doesn't do anything and the Vizio logo isn't lit up (probably controlled by the main board?).

I'm seeing 1.25vdc on the right legs of both IC102 and IC202 optos.

Safe to assume the issue is the main board? Or are there other tests I can do to help confirm?

[dskall]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

What are the voltages on the connector pins with power supply jumpered?

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

5.1vdc on pins 1 - 4.
12vdc on pins 10 - 12.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Anything else I can check? I would love to get this thing out of my garage - either fixed and into the house or still broken and given to a recycling center.

[dick_barton]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Okay that's what I figured. I'll have to go to my local Radioshack for some resistors before they shut down.

I really appreciate the help.

Repeat what BudM said in post#25 but add a second resistor from +5VSB to BL ON/OFF to bring the backlights on.

[vinceroger69]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

ignore wrong thread

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Repeat what BudM said in post#25 but add a second resistor from +5VSB to BL ON/OFF to bring the backlights on.

I added a resistor to BL on/off and the backlights flash but they don't stay on.

[dick_barton]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

With the resistors in place as above do you have all the following voltages on the power supply, 12v, 18v, and 5.1v

Check the voltages at the two fuses on the inverter board. Both sides of each fuse.


Have you read through the following
https://www.badcaps.net/forum/showthread.php?t=29914

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

With the resistors in place as above do you have all the following voltages on the power supply, 12v, 18v, and 5.1v

Check the voltages at the two fuses on the inverter board. Both sides of each fuse.

Have you read through the following
https://www.badcaps.net/forum/showthread.php?t=29914

Voltages match everything Thunder88 listed in that thread including the inverter board. I had read it before but didn't understand much of it until now - going through these troubleshooting steps has helped a lot.

When comparing my issue with Thunder's, they don't quite match up. With my case, the Vizio logo never changes from solid orange (although it's not lit at all now that the main board connector isn't plugged into the power board).

With the BL on/off jumped with a resistor, I'm assuming the backlights should stay on when there's power to the TV, correct? That's not the case here.

[budm]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

It may require another resistor for Dim control pin for the backlights to stay on, or check the DIM control pin to see what you have.
But at this point you may have problem some where on the main board since it does not send the PS-ON to turn on the rest of the power supplies or something is locking out the main board such as backlights failure so the LED driver board sends out the error to the main board to shut own the main power supply.
I wonder if the PS-on jumps up high for second and then goes low or not.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

I wonder if the PS-on jumps up high for second and then goes low or not.

I did test that before adding these resistors. I grounded my multimeter using an alligator clip and held the positive probe to the PS-on pin while pressing the power button but I did not see a voltage increase. That is what I would see, yes? Voltage on the PS-on pin?

My first inclination was to blame the main board since I wasn't seeing any attempt to turn on the power supply when pressing the button. But it's also a little tough because I don't yet have the remote so I'm relying on the stupid "jag wheel" which may or may not work.

I may have to remove the resistors and play around some more with the main board connected.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

I removed the resistors and did some more testing. I didn't find anything new but I did confirm that I'm 100% not receiving any signal to REMOTE ON/OFF when the power button is pressed. I pulled the jag wheel (power button) and confirmed it's working (continuity on the two main pins when pressed) so I think, at this point, it's safe to assume the main board is the issue.

I'm going to take a chance and send the board in to a repair service. Minimum charge if it turns out the board is already working is $25 diagnostic fee + shipping both ways. Maximum charge if it needs to be repaired is $120 + shipping to them.

I'll update this thread once it's completed.

[nelliott500]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

Got the main board back today (they said it tested bad, they serviced it, and then it tested good). I installed it and the TV fired up. I hooked up my laptop to test the image and it looks pretty good although it's a little tough to tell because I had to lay on the floor of my garage - the TV is laying flat on sawhorses.

I did notice an intermittent back light flashing. I need to do some more testing (different input, different type of input) to see if it's something to worry about.

I really appreciate all of the help that was provided. My gut feeling was the main board but the dark spot on the power board really threw a wrench in it. I'm glad you guys were able to walk me through forcing the PSU to turn on.

[budm]

Re: [Vizio XVT3D554SV] Orange logo, won't power on

That dark spot on the power supply board is part of the power supply for the backlights, more likely that dual-supply is only have one working supply instead of two (as you can see, they are identical circuits). So keep the Bakclights level as low as possible for now.