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Horizontal “tearing” every few seconds then returning to normal. I suspect a sync problem but it would be nice to know which circuit board is causing the problem. I am going to try to attach a video of the problem.
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@btidmore make sure that you try all input sources and use a new HDMI cable if that is what you are using. This could be an issue with the main board as well as the panel screen rolling is commonly caused by their Gate driving side (supply/signals line) on the panel driver boards. The signal comes from the T-con board. If you want to , check the voltages on your T-con board. You would be looking for VGH,VGL,VDD,VCOM,OE,CPV,STV, and of course ground. If those are good it's most likely the Gater COF but we will need more info and results:-)
Let us know what you find. Depending on your TV there may not be a separate T-con board but it may be integrated to your main board. I'd go with a main board first. Let us know what the model number for this Vizio is
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Thanks for the reply. I used to be a TV repairman (1968-69), but we carried tube caddies back then😜. I owned a computer store for several years and did lots of repair on laptops, so I’m pretty sure the panel and backlight are fine. I suspect a sync problem and thought the T-conn board might be the answer but I’m not familiar enough with all its functions to be sure. I also can’t find a schematic showing the voltages.
If I can find the repair kit, which has all three boards, I’ll just buy that but everyone seems to be out of stock at the moment.
I did try another HDMI cable but it didn’t help. I buy good cables so I didn’t think that was the culprit. I also tried bleeding the power supply with the power cable off and holding the power switch on. That used to work on my old Sony WEGA(?).
The model number is D43-F1.
Thanks for the feedback.
@btidmore you were in it during its heyday. A real TV repair person. You know what, that is awesome. I miss the days where every city large or small actually had a tv radio repair shop. So much knowledge that we lost based on changes in technology. Now, nobody wants to fix any of this and we get told to buy new stuff.
Anyhow, you said three boards. So you have a separate T-con board. If you have the voltages on your T-con board, I’d get the main board first. Yes, if you can get all of them, even better. Schematics for Vizio’s are not available.
Yeah, back in those days color TV was fairly new, most people still had the black and whites. We made house calls to fix their electronics. We charged $5.00 for a B&W call, $7.50 for color. Ancient history now, the switch from analog to digital is complete. I went from TV repairman to being a field engineer for a large computer company so I made the switch also.
I’m still trying to source the parts but eventually I will find some in stock, probably on EBAY. In the old days we had SAM’s manuals for every model but nowadays only the manufacturer has tecnical manuals because they’re not really meant to be fixed, especially by the DIY guys, like us. Anyway, the PCB’S are hard to troubleshoot and the components aren’t meant to be replaced. You just swap boards, which is actually a lot easier than the old days, with discrete components and vacuum tubes requiring a lot more electronic knowledge and troubleshooting ability to repair.
You can’t stop progress but it’s fun to remember the old days.
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