Question about Proview Mh422su 42 in. EDTV-Ready Plasma Television

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Hello. i have a proview mh-462su plasma television. when powered on, screen is black with red and white bars. after a couple seconds, screen goes completely black and power indicator led on front of the set turns to yellow and tv cannot be turned off without unplugging it from wall. can it be fixed?

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The fact that the set no longer allows you to turn it off indicates that the power supply for the power control circuit isn't supplying the voltage it should or none at all. The service voltage for the circuit that provides IR (remote) control and probably any set-mounted controls as well, is the primary supply. I believe the high voltage for the plasma display is working but the signal (video) input is scrambled due to a failure of an output (or more than one) of the primary supply that provides voltage to the video and audio sections.
Try following the instructions I have pasted below:
Unplug your set overnight to allow potentially hazardous voltages to discharge, remove the back panel of the set so you can see the guts.
Look for a smaller board with larger parts on it; some cylindrical (capacitors), others block-like and relatively large (chokes and transformers).
You should also see a relationship between the board and the incoming AC.
Check the board for a label or if not present, a stamped-on number.
Call the manufacturer's service center with your TV model number and the number found on that board and inquire about repair/replacement costs; if both are offered, they won't be that much different.
If you must buy a new board, don't dispose of the failed one as there are smaller companies that can repair it for less than the mfr. and then keep it as a spare as this problem will likely arise again.

Posted on Sep 07, 2009

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