Re: Vizio xvt472sv - PSON Always has Voltage

I won't give up, I'll stow it away with the others I've collected from friends, family, or such. I have a pile of about 10 or so TVs that I am finally getting around to tinkering with.

I've searched all over the net and there are none of these mainboards to be had, but worst case, maybe I'll offer up the remaining parts of this one for another needy soul.

If you do find that schematic, def post it up.

Best of all, this project led me to this forum.....a valuable resource indeed!

Re: Vizio xvt472sv - PSON Always has Voltage

Thanks for the reply. I have been searching for a diagram for it as I see jasonpeters needs it too, but coming up dry. Looking more and more like just replacing the mainboard, but they are pretty rare it seems.

Re: Vizio xvt472sv - PSON Always has Voltage

Set aside the PSON always on and further diagnosing the no picture finds that the T-con board is getting no power. Following another thread on here (thanks jasonpeters!) I found U33 not turning on. Jumpered with a resistor to GND it turns on and now have 11.9 to T-con, but no difference...no pic or backlight.

Has anyone had the issue with the PSON being activated as soon as you pug the TV in? Can someone point me in a direction to start figuring that part out?

[B]T-con Board[/B]
Main Fuse - good (11.9...

Re: Vizio xvt472sv - PSON Always has Voltage

Follow up info:

L354
[U]G1084[/U]
U9 (backside of mainboard) .55 1.81 3.29


[B]LED Driver board[/B]
Both main fuses good and passing 24.3vRe: Vizio xvt472sv - PSON Always has Voltage

Follow up info:

L354
[U]G1084[/U]
U9 (backside of mainboard) .55 1.81 3.29


[B]LED Driver board[/B]
Both main fuses good and passing 24.3vRe: Vizio xvt472sv - PSON Always has Voltage

Follow up info:

...

With TV is plugged in and NOT pressing the power button, PSON already has 3.16v and the PS is switched on providing 5v, 12v, 18v, & 24v. The power switch is not stuck closed and is showing 2.29v across it when pressed.

Although the PS is switched on, there are no backlight or picture present, just a dim white Vizio logo. The picture and light may be a separate issue? But why is the PSON signal always on?

Thanks for any help!

[B]Main Board[/B]
F1 5.10 5.12
F2 12.02 12.02

L271
[U]G9117[/U]
U2 2.05 3.30 ...

Re: New Members - please post your introductions here

Hey Hey, this looks like the place to be for everything TV!