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Tv screen previously posted about jvc av32f802 tv. I get no picture at all, just bright wavey colors

Posted by ERIC RECTENWALD on

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marcial nasi

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U must have schematic diagram for that and check all the vcc of jungle ic.

Posted on May 09, 2007

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1answer

Well i don,t know what i did but there appeared light color of light black back ground i can not remove this background picture how do i shut it of thank you.

U turn to another channel,now it look like u have a picture of a shadow behind it?Yes,than u have freeze a picture on the tv for a long,might have a tv screen burn in.Tries go into tv menu go to colors setting.Tries contrast setting all the way up to maximum.Tries colors a third of a setting.The brightness half of it setting.Should or might help to solved this problems.
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An aging FBT if it still can be adjust using screen adjustment on FBT that will be a small tweak.

But if you are inexperienced with this, asked someone who knows how to do it to fix it for you.
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vertical output ic needs to be resoldered. careful leaving that bright line displayed on the screen as this will cause a permanent phosphor burn into the tube. this can not be corrected once burned unless you replace the tube. mch
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Hi

Try to re settings your Unit... go to settings then choose color setting then click brightness control or the contras control.
Thanks!
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Roger, if your contrast (sometimes called picture) and brightness controls are at max you can increase the tubes brightness by turning the "screen control" clockwise, be advised a little turn goes a long ways, don`t crank it too far or you will get retrace lines, you will have to remove the back from the set and follow the red wire down from the tube to the "flyback transformer" on the front of the flyback are 2 controls, focus and screen, do not move the focus control, this should fix your problem.
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If you feel good about opening your set then you can try this: Look for the flyback (high voltage) transformer, with the thick red wire which goes to the top of the picture tube. There are 2 controls on the flyback transformer, focus (top) and screen (bottom)Turn the brightness and contrast all the way down and then increase the screen control until you see retrace lines, and then back it down until those lines just vanish. Return the brightness and contrast to normal and adjust the focus control, if necessary, for a nice sharp picture. Let me know if that brings your brightness back.
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I assume you get a picture in there somewhere? The discolorization is caused by the degauser circuit malfunctioning or un-shielded speakers sitting too close to the TV causing magnatism in the CRT (picture tube).
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I likely you have a loose conection in the crt board at the neck of the picture tube or a loose conection close to the high voltage transformer,I would suggest to tap the main board as well as the crt board with a wooden or rubber handle(not metal),be attentive were you tap to see if the set reacts ,if the set reacts you will need to resolder those places ,be carefull working on a set that is on while you do it,this should give some idea what the problem could be in case you want to call someone to help you with the repair.Let Us know if you need more information.
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Vizio E3D420VX-IR Sensor keeps going bad I replaced IR board after sophomoric mistake of replacing multiple remotes feel bad for erroneous product review now. Worked for a few hours, then... Stopped. All parts handled with ground strap upon my arm attached to ground prong on unplugged power cable. Unit was dusted with air duster prior to removal of factor/original board. Shopjimmy replacement fixed issue, so tv put back in place and tested again. Still worked. After turning TV on again next day... Unresponsive to TV remote nor the matched BD-Player remote with volume button for Vizio TVs. Ordered another part, and worked again until powering and repowering TV. Wondering if, on startup, the board is somehow getting a big jolt or shift in ground potential or ESD release frying the chip on-board after only a couple startups. I just bought and received in the mail another IR board along with part rebuild kit for the board containing just an ir sensor and either a tiny resistor or mlcc to replace on board. It's possible that it's simply the age of the TV and manufactured parts this is one of the 1st 3D HDTV's released that didn't require powered 3D glasses. However, prior to risking this 3rd and maybe 4th replacement, where else should I look for problems? I was thinking maybe clean connector pins with alcohol to ensure ground on board not getting ESD or stray voltage? I don't recall which board the wires from ir board go to I'm guessing the main and maybe power board?. Maybe a bad capacitor on the power board? I know this TV is notorious for the IR board going bad.... I guess the main questions here are: 1- what can cause the IR board to go bad in the 1st place, and what component actually does go bad? I would guess it's the components in the rebuild kit, so... Would a heftier resistor to get higher amplitude out of the sensor/transducer if in fact i de-solder the sensor and check for output in response to infrared stimuli and it seems to be working but whole board doesn't? 2- Has anyone ran into this before with an IR board popping over and over? Do they even get a power input? I thought it was just the IR transducer powering them similar to the voltage coming off a thermopile from the pilot light on HVAC equipment and the single chip on the board modified the sensor/transducer output signal to cause a given reaction based on remote input and main board processing... 3. Should I just try the new part as it was just happenstance and my luck really does go like that every day?

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