55" Vizio XVT553SV no power, just orange standby after power surge

[mitsu2k]

Hello gentlemen!! I'm working on a Vizio XVT553SV tv. What happened is there was a power surge in the home electrical lines that took place with the tv off. However, the tv no longer turns on. The orange Vizio Standby logo lights up orange and never turns to white when the power button is pressed nor does the tv have any audio or video. I did notice however that when the power button is pressed, the standby led goes from bright to dim orange several times. I currently have the back cover off the tv. I have checked the main fuse on the power board as well as all the small fuses on the mainboard and all were good. I am very comfortable working on boards and soldering but I am at a loss for where to start in diagnosing the problem here. Not sure if the problem lies with the power board or with the mainboard. I would greatly appreciate if you guys could help me along with this.

Thank you!!

[tom66]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

This is most likely a bad main board on these models. If you post some pictures of inside the unit, it may be possible to rule out the other parts so you know it is the main board at fault.

[mitsu2k]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

Hello Tom, Thank you for your help. The requested photo is attached.

[tom66]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

OK, left hand yellow board is your power board.

Right hand green board (with video inputs) is the main board.

On the power board there is a power cable which connects to the main board. Can you get a closer shot of around that cable?

[mitsu2k]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

Hi Tom, these pics may not be clear enough but let me know if I need to take better ones. Thanks!

I found someone has some good pics here: https://www.badcaps.net/forum/showth...light=XVT553SV

The TV is at my friend's house so I am unable to take new pics at the moment but hopefully the ones I have and the pics from other thread will help.

[mitsu2k]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

Any ideas?

[aaronwt6]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

I would say this is almost certainly a main board fault. Even if the power supply wasn't working, the Vizio light should turn white when the power button is pressed. The same 5V that runs the standby light also turns it white. I've had a few in this same state. The couple I did have with PS issues were at least outputting 5V and the logo would turn white even though nothing happened beyond that.

[aaronwt6]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

Seems these get damaged real easy from brief power outtages. Been the story on most of the Vizios I've picked up. Power goes out, TV never works again.

[mitsu2k]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

Hi Aaron, that's what I sususpected. Do you think it's worth it to try and diagnose the fault on the mainboard or just replace it?

[aaronwt6]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

Eeprom chip would be a likely suspect. You could check all the voltage regulators too. I've heard of people having luck with an eeprom swap but I tried two with no success.

[Ronkirsch]

Re: 55" Vizio XVT553SV no power, just orange standby after power surge

I've got the same problem with a Vizio XVT553SV. Power turns the logo orange but never white. Were you ever able to fix yours?