Vizio XVT553SV Power up problems

[avia581]

Hello everyone. I have had this TV for a few years and it has given me a lot of trouble. It has been replaced by the factory once while under warranty and then a year after it was replaced that unit went black. I had a company repair the TV. They installed a new main board and I think the T-con. Now it has gone black again. It stays in the standby mode and will not fully power up. The little vizio light on the front stays an amber color and pulse's to a dim amber after hitting the power switch. It should light up bright white. Does anyone have any ideas for me. Thanks in advance.

[newtothis]

Re: Vizio XVT553SV Power up problems

Open the tv up and take pictures of each board individually, one up close of each connector on the power supply board so we can see any markings and one of the entire back of the set.

Do you own a multimeter?

[avia581]

Re: Vizio XVT553SV Power up problems

I do own a multi meter. I have also attached the photos. Thank you.

[newtothis]

Re: Vizio XVT553SV Power up problems

Connector CN202... DMM set to 20VDC, Red probe into the 3rd wire (red, PIN 3) connection (just push into top of connector where wire goes) and black probe to chassis (screw hole is good)

Reading before and after you try powering up the set?

[avia581]

Re: Vizio XVT553SV Power up problems

It reads 5.17v before and after the switch is pressed.

[newtothis]

Re: Vizio XVT553SV Power up problems

CN201, Same as before on pin 1, 4 and 5

[avia581]

Re: Vizio XVT553SV Power up problems

The readings were the same for before and after pressing the power switch.
Pin 1: 2.1v
Pin 4: 5.17v
Pin 5: 5.17v

[newtothis]

Re: Vizio XVT553SV Power up problems

Do you have a 470 - 1k resistor at hand?

[avia581]

Re: Vizio XVT553SV Power up problems

I have 2 resistor at hand. They read
9.95K and 3.3K Would they work?

[avia581]

Re: Vizio XVT553SV Power up problems

I also found ones at
0.465k and 24.0k

[newtothis]

Re: Vizio XVT553SV Power up problems

Can you take a closer picture of the connector from the PSU to the mainboard please

[avia581]

Re: Vizio XVT553SV Power up problems

Here is a closer pic

[newtothis]

Re: Vizio XVT553SV Power up problems

Ooo just realized this is an LED lol... Let me just check something.

Tom66 which pin is it to force this PSU on? Still same rating resistor to do so? Take it 465 is Ok too?

P.s Tom clear your PM's out LOL.. No one can message you