Vizio M470SL, has sound, no white moving picture.

[Chrisirl85]

I have a Vizio M470SL, i have sound, but the picture is moving in a whitish blur. When one of the two ribbons are removed the corresponding side turns black the other stays the moving white, and visa versa. I'm not an expert when it comes to TV's. But does anyone have any idea what I should look at?

[capkid]

Re: Vizio M470SL, has sound, no white moving picture.

Got pics? You might want to post pics of the circuit board layout and what you're seeing onscreen.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

Here are the pictures you've asked for. This is with my DirecTV hooked up via HDMI. First picture is the TV just turned on. The second pic is with the menu popped up. The white screen moves side to side but stays white for the most part.

Thanks!
Chris.

[capkid]

Re: Vizio M470SL, has sound, no white moving picture.

Did you buy this TV used, and did you ever see it working correctly? The first two pics of the panel don't look good.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

It belonged to a friend before he gave it to me when he bought a new one. It worked a week ago, then started doing this out of the blue. Here is the other board without the shield on.

[capkid]

Re: Vizio M470SL, has sound, no white moving picture.

Some of these panel issues are hard to diagnose, but I'd say you have a bad t-con (LED driver board), which is the board in the last pic you posted, or you have a bad panel. The t-con should be fairly cheap to replace.

http://www.ebay.com/sch/i.html?_trks...at=0&_from=R40

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

It's 50 on shopjimmy and 40 on amazon, so not to expensive. The T-con was my best guess.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

Is there any caps or resistors etc I should check just to be sure it's not something other then the whole t-con?

[capkid]

Re: Vizio M470SL, has sound, no white moving picture.

I was just thinking that myself. There aren't any BGA chips on that board, so you might be able to find and replace one or bad components or possibly rule out the t-con altogether. I'd probably start by doing some voltage checks on the t-con at the connectors.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

With the power on or off? I'm not to intelligent with the inner workings of electronics, nor risk of shock for that matter. lol

[capkid]

Re: Vizio M470SL, has sound, no white moving picture.

Check voltages with the TV turned on. Put your multimeter's negative lead on a metal part of the TV's chassis (panel is fine) and touch your positive lead to each of the points on the t-con at the connectors. Record the readings. Just be careful to not touch the power supply while you're doing these tests and you should be fine.

Edit: I don't know the exact specs of those connector voltages.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

Ok so I come up with 65 across 1-5(vin)
0 across 6-10 (grounds)
0 on 11 (stauts??)
8 on 12 (on/off)
0 on 13(NC)
0 on 14(pwm)

Any of that look like it could be an issue?

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

Any ideas anyone? I'm at a standstill with this t-con board. I can not find the voltages they should be anywhere.

[budm]

Re: Vizio M470SL, has sound, no white moving picture.

That board you tested is not the T-CON board, it is the LED Backlights driver board.
This TV may have one of those LCD panel with built-in non- replaceable T-CON board (or the T-CON is on the main board). You need to look under the metal shield.

[capkid]

Re: Vizio M470SL, has sound, no white moving picture.

LOL. Boy, I totally missed where the cables were running.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

Lol so did I. I'll take a look under that shield. I'll report back in a few.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

Here is what is under the shield.

Edit: They just attatch to two clips off the side of the panel. The main board does have two in one it seems. it says primary and secondary.

[budm]

Re: Vizio M470SL, has sound, no white moving picture.

I am not sure if the T-con is on the Main board for sure or not at this point, but it sure does look like it. One way to find out is to look for the spec sheet of the LCD panel. You need to look for the sticker on the panel some where.

[Chrisirl85]

Re: Vizio M470SL, has sound, no white moving picture.

I did not see any sticker on the panel itself. I'll double look later tonight and repost, but I'm sure there is not a sticker with specs on it tho. Unless it maybe under one of the boards??

[budm]

Re: Vizio M470SL, has sound, no white moving picture.

The stickers are on the top right corner, left one is the bar code, the right one is the model sticker which I cannot clearly read the numbers. It is made by LG LCXXXXX