Question about Vizio P2 42 in. HD-Ready Plasma Television
I have a Vizio 42 in. Plasma.
Symptoms: While watching TV I heard a click (same click when tv turns on or off - is this relay?) and picture went black. Still have sound and ability to change channels. Can not see menus. When I turn tv on or off, if tv has remained plugged in I hear no usual click, but I will hear audio of tv program. If I unplug tv each time after I turn it off, then when I turn it on I hear initial "turn on click", then several seconds later I hear a 2nd click, which I think is the picture turning off again, then I hear audio of program and can turn chanels. (What I have now is a large expensive radio). After being on, when I turn it off and on again I hear no clicks, unless, as mentioned, I unplug it, then plug it back in.
What I have done so far: I took off the back and checked the fuses on the circuit boards first. There was one bad fuse on the y-sus board. I replaced that fuse and continued to have all of the same symptoms.
Further symptoms. I unplugged the y-sus board, next to the fuses where it seems that the power enters the board. Then I again turned the tv on and off. When I did thisthe tv seemed to act normally - I heard the "turn on click", it did not click a couple of seconds afterwards, and I heard the "turn off click" when I turned it off. I could turn it on and off, heard the clicks at the appropriate times and did not need to unplug it. In other words, when the y-sus board was unplugged, It seemed to operate fine except there was no picture.
I got this same result when the y-sus board was plugged in, but with one of the fuses removed.
There are three fuses on the y-sus board. Two are easily replacable, one is very small and soldered in place. I can not remember which of the two replacable fuses was blown, but I will look when I get home and add that info if it is impotant.
I was thinking that maybe there is a problem with the y-sus board that causes the picture to turn off shortly after being turned on even though I think everything else continues to function properly. I know the y-sus board is connected to other components, so maybe the problem is further down the line, maybe one of those tall thin board on the edge of the tv. I don't know where to go from here. I could try replacing boards one at a time, but that will probably cost more than the tv. I would prefer to replace a component on one of the boards if I could isolate the faulty component. Or replace the board with the faulty component if I could isolate that board.
Are there more tests that I can do to narrow down the problem? Is there enough information here to make any suggestions? Is it likely that the blown fuse is in the same circuit as the faulty component? If so are there schematics to trace this circuit. I could probably learn how to test the components of the board with the meter I have if that would be useful.
Ok, enough questions! Please let me know if you can help, and thank you very much.
Not having the electrical diagrams makes that hard.
I would say that finding a good tech with parts access is your best bet.
You've spent a good chuck-o-change on it.
Posted on Jan 09, 2009
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Posted on Jan 02, 2017
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