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Re: No picture or sound
If you see only snow and the words "NO SIGNAL" are displayed, and you know that you have the set hooked up to a good signal and the TV is set to the right channel, it means that your tuner has stopped working and needs to be replaced. First, though, make sure your signal is good. A good way to test this is to hook the TV to a good VCR, put in a good pre-recorded tape and hit play. Tune the TV to channel 3 (or 4) and if it is still all snow, have the tuner replaced by a qualified tech.
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try to watch a movie that doesnt contain snowing... If you mean white pixels for no reason on the screen while whatching the tv it can be caused by unstable power, or tv signal. try to remove tv cable, then replug it so the picture will clear
My personal guess would be that there is no signal coming through to your tv or the wrong signal coming through. I have the opposite problem...we get picture (snowy) but no sound except that of snow and the Audio/Sound options are NOT helpful.
Wish I could be of better help.
Assuming the picture tube lights up and you have snow when selecting the tuner function, I would first hook up a working VCR with a good tape and play it while the set is on channel 3 (if that is what your VCR is set to). If no sound or picture is displayed while the tape is playing,it could indicate a defective tuner. If you don't even get snow with no antenna connected (unless your set is designed to go to a blue screen with no signal present) then you could have a problem in the video processing circuits which would explain no picture with the RCA connections as well. This would probably make the set beyone economical repair.
Since it has voice or sound then I don't suspect the tuner but probably the tuner does not have the 33 volts that goes through r106 location number on the board. It is a 27K resistor and can be bought for about a dollar at Radio Shack. (pack of 2or3) A repairman or someone experienced in electronic soldering and desoldering can change it easily. Could cost around $50 to repair depending on the serviceman. If it has rca jacks (red, white and yellow) The tuner can be bypassed if you have a cable box that passed these signals: audio left and right and video. Hope this helps