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Re: dell 42" plazma tv
Turn the tv with the rear cover facing you. power on the tv, look into the grills on the rear cover. If you happen to see 3 green lights together on the mainboard, you have communication signal. Otherwise, its the mainboard. If u get all 3, then its your Y main board and probably a lower or upper buffer, depending on where burn is located on panel board.
The problem is a $1.09 part. You will need a soldering gun, multimeter, etc.. Or someone else who is electronically inclined.
The fix for it is here: http://www.instructables.com/id/Dell-W5001C-50quot-plasma-fix/
I have the 46" Dell model with the same problem, Dell Logo all pixilated and fading out to black screen, and this fixed it. Part cost $1.09 plus shipping.
I can't take credit for this persons post so post thanks on the fix.
Just note, TV's can hold electricity even after being unplugged. So if you try this keep that in mind. You shouldn't mess with it until an hour or so after you unplug it and even then there could be electricity in the large capacitors that can harm or kill you. Google "discharging capacitors" to discharge the electricity from the power board. Attempt at your own risk.
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do you own the following tools:
t20 torx screwdriver
plillips screwdriver, pref. cord drill,
digital volt meter
remove back cover of tv. (MAKE SURE TV IS ELEVATED AT LEAST 3FT from ground away from carpet. Please refrain from walking on carpet during diagnostic test. turn dig meter on vdc. THE POWER BD is located on the top middle. It the biggest board on the TV. look very carefully at the board. USE PLENTY OF LIGHT. Back away from the TV for 1 minute. look to the top right, you will see a sticker with leads. Ve, Vscan, etc... located next to each one is the propoer voltage. rturn to the power board. the is a contact next to the specified lead. look for that lead, and take the voltage . repeat process 3 times, from there, get back to me. anything not registering properly, will identify problem with TV.
the problem was the y-sus board, i had a local tv repair shop diagnos that much for me. although, he couldn't fix it i did some research and found a company in california, itritek.com, who could. you send him the y-sus board and the two buffer boards and he not only repairs them but he upgrades them. apparently the y-sus board gets too much heat and eventually goes out, sometimes the buffer boards are affected too. itritek.com replaces the components on the y-sus board with better parts which are more heat resistent. i believe this will help you with your problem. let me know...good luck.
i had prob where my sony would switch off for a few secs thenh come back on . The solution was in menu / tv settings / sleep timer . Go into that and make sure its set to off. there are opions for off , 5 min 20 min 30 min etc... mine was set to nothing just blank.
First thing to check is if the back lighting has just failed... Power the set on and looking across the screen can you see a shadow of a picture happening? You might even use a flashlight to shine directly at the screen while you look at it from an angle.