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Hello, Your Maxent MX-42EPM20 is not a TV (Television) it is a Plasma panel. The difference being your Panel does not a TV Tuner (no Coax jack or electronics relating to a tuner) Below is the spec sheet that shows this http://reviews.cnet.com/flat-panel-tvs/maxent-mx-42epm20/4507-6482_7-32139310.html?tag=mncol;subnav
You can use a cable box or a cheap Digital TV receiver. You can buy them at walmart, You need one with A/V out puts such as Component. Here is a link to one. This will give you a tuner. http://www.walmart.com/ip/RCA-Digital-TV-Converter-Box-DTA800/8343230
Are you sure that its the main A/Vboard coz it sounds like the main power supply issue to me. Anyways the mainboard is the large board usually located at the center of the tv. If you can remove the back cover of the tv and get me a high res picture of the tv I can mark the board for you.
Try unplugging it for an hour or so or try change sources , if the
computer ever fell asleep while it was plugged in it is possible it
triggered a sleep mode in the tv. Most will do such a thing. It is
doubtful that the computer caused any damage to it but i would advise
against using a plasma tv as a computer monitor because burn in WILL
eventually occur with a static image left on the screen constantly.
Use the instructions that came with the device for full details. Their site is down, so you can't get a manual online at this time.
Usually, all you need is video input (a cable connection) and power.
If you have a straight cable line (no box), coax cable connection is will work if supported.
If you have a box, the better cables support the RGB and audio split, and will give you a better quality picture.
Be sure all are secure connected, and that if you use the RGB/Audio split connection, be sure each matches the color coding on the connector.
Your TV monitor cannot support the format (scan rate) that your computer's display card is putting out. Go in to the computer's set-up for the resolution under the display properties and adjust the settings to support the TV monitor. Refer to the TV's instruction manual to see the supported formats.
When going back to the computer's display, the display format will have to be changed back to have the proper resolution.
TV sets are generaly not as good as dedicated computer monitors for use on computers.
I'm sorry you have not been given a clear ansewer on how to repair your TV. I know how to fix the problem you are having (1.5 inch Black vertical lines that come and go) If you still need help fixing your Plasma TV please feel free to message me @ firstname.lastname@example.org or just give me a call @ 1-503-432-9904 and I'll help you fix your TV buddy! Ask for Dave!