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Tv turn on,this happen.Make a fist bang on the tv frame,see if tv have a picture come back or have it flashes in and out?Yes,than tv is having cold soldering joints on the video board pins that connections to between video board and the CRT-(tv tube) those joints connections pins on the video board are to make the CRT-(tv tube) to have a picture.U have all the tools like a soldering iron,a roll of solder and also can u do basic soldering work?Yes,take the tv aparts.The video board,that the the board that connected to the CRT-(tv tube).Resodering all the soldering joints connections pins between CRT-(tv tube) and video board should solved this problems.Or tvs shops can do those resoldering for u,by telling them the problems.It should cost u like around $50.
Ok This may be due to having a heated CPU/MOTHERBOARD and can cause a fuse to shut down to stop further damage like when a computer detects problems. My solution would be to get an airated space and when it shuts down feel the back of the tv to feel for heat, open windows when turning on or blow a cool hairdryer into the back of it.
TRY THESE STEPS >Check the buttons on the TV make sure they are clean and not sticking. >Check the Remote Control buttons and see if they are sticking >Clean the Face of the infer Red lens to the remote and the TV... clean them with a small rag or paper towel (Do Not USE Abrasives to clean any part of your Electronics) >Check the plug for any defects >Reset your tv back to it,s factory settings >And if any thing locate your user manual and find the 1-800 number
I know that shortly after I purchased this tv mine also shut itself off occasionally. The owners manual says that if it is on dvd mode and it's paused or on an inactive menu or something for 15 minutes or so that it would shut itself off. If a dvd is stuck inside it may be causing this? I have no idea about the open/close malfunction.