Vizio VL470M main board or panel problem?

[mu2]

Hello,

This Vizio VL470M powers up, backlights come on and there is sound and a compressed picture (about 1/2" high) at the top of the panel with an hdmi input. The rest of the screen is grayish and does not appear to have any physical damage.
Power supply capacitors look fine and they are high quality. I checked the 1117 regulators on the main board and they also are correct voltage wise.
Fuses are good.
There does not seem to be a tcon board. Two ribbon cables go directly from the main board to the panel.
Main board is 3647-0252-0150(6C)
Panel is LC470WUH Suzhou Raken Technology Ltd.
Heating the main board and the top and sides of the panel do not improve anything.

My best guess is that the panel is bad but I'll defer to the experts.
So the question is: Main board or panel?
Thanks

[tom66]

Re: Vizio VL470M main board or panel problem?

Well, I've never heard of "Suzhou Raken Technology", but it appears to be a joint venture between LG Display & AmTRAN (who make most Vizio TVs.)

It's most likely panel. If you feed in video, can you see a small slit of it on that top bit?

[mu2]

Re: Vizio VL470M main board or panel problem?

Yes, when I plug an hdmi cable into the set I have both sound and a tiny sliver of video at the top. Never fills the screen.

[tom66]

Re: Vizio VL470M main board or panel problem?

I'd say panel, possibly tab bonding issue.

[mu2]

Re: Vizio VL470M main board or panel problem?

I forgot to mention that I removed, cleaned and reseated the ribbon cables both at the panel side and main board side.
It's a real shame that the television is manufactured so poorly!

[tom66]

Re: Vizio VL470M main board or panel problem?

It would be possible to repair the LCD panel in this instance, potentially.

[mu2]

Re: Vizio VL470M main board or panel problem?

I'd appreciate any suggestions on how you would attempt to repair the panel.
I have another Vizio that I'm pretty sure also has a bonding issue.

[tom66]

Re: Vizio VL470M main board or panel problem?

https://www.youtube.com/watch?v=xHst6pKLtTE

[MisterD]

Re: Vizio VL470M main board or panel problem?

I had to use a hair dryer and heat the tab bonds first before I could get any results when pushing on them, press firmly. here's my thread link.

https://www.badcaps.net/forum/showthread.php?t=25709

[tocold4u2]

Re: Vizio VL470M main board or panel problem?

maybe a ribon cable isn't seated all the way??? it's easy to do,thats for sure.

[kmpemberton]

Re: Vizio VL470M main board or panel problem?

I can't start my own thread because I'm new. However I am having a very similar problem with a Vizio VL470M. This Vizio powers up, backlights come on I have not been able to get any sound. There is a blue stripe approx 2 inches across the top and the rest of the screen is gray with faint vertical lines. I removed and inspected the power board and main board and both look fine. No bulging capacitors or burnt spots. I checked the tabs on the panel & they all seem fine as well. They all were hot to touch and when applied pressure there was no change in the screen. Not sure if I should give up and write it off as a bad panel or could it be a bad board? Thanks for any help!

[johnboy1313]

Re: Vizio VL470M main board or panel problem?

Bad panel

[ETCS_RETIRED]

Re: Vizio VL470M main board or panel problem?

I can't start my own thread because I'm new. However I am having a very similar problem with a Vizio VL470M. This Vizio powers up, backlights come on I have not been able to get any sound. There is a blue stripe approx 2 inches across the top and the rest of the screen is gray with faint vertical lines. I removed and inspected the power board and main board and both look fine. No bulging capacitors or burnt spots. I checked the tabs on the panel & they all seem fine as well. They all were hot to touch and when applied pressure there was no change in the screen. Not sure if I should give up and write it off as a bad panel or could it be a bad board? Thanks for any help!

Did you find a solution? I have the same exact problem.

[MisterD]

Re: Vizio VL470M main board or panel problem?

Heat tab bonds with a hair dryer, then push on them.

[dominicMc]

Re: Vizio VL470M main board or panel problem?

Does this match the problem you guys were seeing here?
This is how it looks when I turn the tv on.



When I reseat the ribbon cables I get half a screen.
Does that sync with it being a posible bonding issue?

[birdboy385]

Re: Vizio VL470M main board or panel problem?

I've got the same TV same problem, i was about to try using my heatguin on low and apply pressue to the tabs. anyone else find anything else ?

[budm]

Re: Vizio VL470M main board or panel problem?

The right side of the panel has problem with the driver ICs on the flexible PCB, not tab bonding problem.

[MadJackee]

Re: Vizio VL470M main board or panel problem?

I have the same problem and was wondering if anyone has ever tried 3M Z-Axis Conductive Tape to repair the connections on top of their screen?
http://www.hitachi-chem.co.jp/englis...ts/do/004.html
https://cdn.badcaps-static.com/pdfs/...b283cc54e6.pdf

I haven't tried anything. Yet!!