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Check the speaker/s first. If found OK; check and replace the damaged component/s at its audio output section circuit. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Sounds as if you have an older model T.V that still use Light tubes to produce the picture,both conditions are indicators that the picture tube is failing. Not many TV repair shops around anymore,since the price of Good quality TV's are realetively inexpensive. may need to buy another.the tubes themselves are very hard to find.
Sounds like a diode may have burnt up or if your really lucky it might just be the fuse.!!! You might want to get a secound opinion .But if you know what to look for , which is any component on the motherboard that appears as if had caught fire sader it out amd replace with exact same component which can be ubtained at radio shack.GOOD LUCK TOO YOU!!!!!!!!!
Not really sure how much the tv weighs, but I know it is a bunch. I have 2 of these t.v.s. One I bought at Wal-mart and after about 6 months it started doing this green screen also. I would normally give the side of the tv a good wack and it would go back to normal for awhile. The other tv I bought from my neighbor who was moving for $25. The problem with this one was the "no picture but I have sound". If I wacked this one I could get the picture to come back on for a while, but it would go out again. Well just the other day I took the back off the "no picture" tv and was looking around. I noticed that the circuit board that is attached to the picture tube was loose. I pushed it back down on the tube and put it back together and the picture has been fine since. So I thought I would check the one with "green screen" issues and sure enough that circuit board was loose also. Pushed that one all the way back down and have not had any issues with that tv either. Hopefully that fixed my problem, I guess time will tell. Maybe it will fix yours also.
Rarely picture tube also shows the same symptom. High pitch sound is due to through deflection area LOT power supply is loaded. Compulsary horizontal output transister short. From your statement i think Lot puncture takes place. Change LOT and horizontal output transister and check tv is now working.
Sounds very typical of a component failing after heating up for a bit. Often in the Power Supply or Horizontal Output section, WE find the offending component(s) usually by using a can "Freeze Spray" and spraying suspected compnents when the problem stops thats ya faulty one... replace it/them and usually thats it. But if ya no good at doing it yourself.. then it's off to the shop... Generally because of ther size these beasts cost a bit to fix.. If ya have to take this route, ensure ya get a firm "Quote" AND an explanation of whats what. G L. Oh and offer to take it to the Shop, this will.should save ya some $$'s