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Re: TV has picture but no sound
It sounds like the audio section of the TV has a problem. If you were going to troubleshoot this yourself I would suggest that you do as a first step would be to inject an audio tone into the input of the audio amp to see if it were functioning, and if you could hear the tone through the speakers that would at least prove that the amplifier was good and the problem was further upstream. I believe that this TV uses an IC for quadrature detection which means the sound and video are separated in the same IC which means if the audio section of the chip is bad you would have to replace the component and it not be within your expertise to do that. So I would suggest that you either take it to a TV repair shop to be worked on, or to your local Vocational High School and give it to them for their electronics program instead of throwing it away.
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12 yrs of service is already fine. If you are going to send it to repair shop and spend around $50-$100 depend upon the faulty parts and you didn't know how long it will last after it repaired, I've suggest you to upgrade to more high end unit. It will give you more quality picture and experienced the advance technology.
Hope it may help you.
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first of all have a nice day..the problem of your tv is a COLD SOLDER meaning there's only loss solder causing by overheated component such as resistor, tranformer etc. check and look closely to all of the suspected terminals, someting looks burning, try to solder all the susupected terminal using soldering iron and solder. chek also components it maybe cracked resisitor or diodes
3 years ago, i had the same problem with a samsung 36", when i switched it on it would stay on for around half an hour, i tried to switch on straight away, but it wouldnt, i had to leave it for an hour or so, then it would stay on for about 5 minutes. And the same thing the next day (half an hour then 5 minutes). I left it into the repair shop, it had to get a circuit board replaced at a cost of £315, dont know how much it will cost to get fixed now, as i could buy the same tv for a little over that now.
I realized that there is a 90 day warrantee on parts and a 30 day limited warrantee on labor for the repairs that were done. As I stated, the original problem was the picture shrinking after a few minutes of the set being on. The repair firm took my control board with them. When they came back to install the repaired control board in my set there was a load spark during the installation, after which I had a black screen and no sound. The repair firm took my set them and installed a "CAP Kit", a STRM6511, and a "D1881". The set worked perfectly until two days ago.
I called the repair firm an they are coming out this Thursday to check out my TV. I am hoping the problem is related to the failure of one of the parts installed to fix a similar problem which occurred after the sparking incident.