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I've got a Polaroid TV and have had nothing but issues with it. Try unplugging it and leaving it for 10 seconds then plug it back in.
You might also have pressed the PIP/POP (Picture in Picture / Picture on Picture)button, which basically tells the TV to display one input on top of another. I could have the name of the button wrong but it's something similar. If you get it to power up again, try hitting that button till it looks "normal" again.
Without physically being there it would be hard to tell you exactly what is the cause of the issue, however this sounds more like a issue on the power board then anything else. Bad Capacitors could be a notable issue in these Tv's. Again without looking at the tv and you could upload a picture or a url where the picture is located to like photo bucket or a sky drive of close ups with the back cover off we could get a better feel of where the issue is.
Many of these tv's that have a hard time turning on is the power supply board showing signs of wear and fatigue.
We do hope this information is helpful of some sense to you.
Make a fist bang on the tv bazel frame.See if u get a picture or flashes of a picture?If Yes,ur tv have cold solders joints on the tv video board,that the video board connected to CRT- tv picture tube.U have a soldering iron and a roll of sloders,also can u do basic soldering?Yes resolder all the Video sockets pins Holes that connected the video board to the CRT tube together.Tv shoud have picture again.
I have Mitsubishi TV CS-31303. It has transient issues. At turn on, it shows horizontal fringes for some time along with picture, then single horizontal line only and then after some time finges at the 1/3rd bottom and then clear full picture. After some more time the clear picture turns into horizontal fringes at the bottom 3rd of the picture and picture rolls and then again the picture is very clear. Some one said that there is an issue in the signal PCB. Where is it and what componets are at fault. I do have service manual which shows circuit diagrams.