When the TV first comes on the sound is clear and great. we usually have it set at about 10. But after at least an hour or longer the sound starts to become distorted and crackly. We have to turn it up to about 15-20 to understand anything on the TV. then within an hour of that the sound is completely gone. Only way to have sound is turn tv off and wait. I usually just go to bed and sound is fine by the next morning.
I just lucked out. The cable box I was using just lost all sound. It was tested on two other TV's to confirm that it was the box and not TV. Got a new box from cable company and sound is back. Thanks for all the help.
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A $700 dollar estimate for a sound problem seems out of line - get asecond opinion (did some one look at it or just a guess). If the sound eventually comes on you probably have a connection (internal) problem or a intermittent part in audio section -cap o/p IC.
If you use a satellite or cable box can you hook your sound from that to an audio system thereby bypassing the TV?
a tv has two components, firstly a power supply produces high voltage to trigger a line transformer, in turn a transformer produces smaller voltages. firstly check if the ht is constantly been produced from a supply, if this is there than go to a line transformer, and check voltages at the output.
It soulds as of your solder joints are getting old and starting to crack. If the screen goes completely black then I would resolder all the major solder joints on the main PC board, and if you mean that the screen goes to all snow (as if the cable went out) then I would also pull the tuner and resolder the joints inside it too. If you do not have experience soldering on small PC boards then allow a qualified tech to handle it for you. The fact that it works sometimes means that all major components are fine and the repair shouldnt cost too much.
The first thing to check is for loose conections,the problem is related to the high voltage but it can start in the main board with one component loose,when the high voltage is developed it goes to what is call the distributor block,a lot of sets have the focus and screen controls coming out of this block for each picture tube,this block might be bad but before we go to him we need to check everything is solid in the main board.If you are familiar with electronics you can remove the back cover and tap the chassis with a wooden or rubber handle to see if the set reacts,if it does you need to be atentive what area makes it react and flip the board to do some resoldering,If you are not too familiar with tv service you need the assistance from a servicer.Let Us know how it goes or if you need more information.