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My picture would go out after several minutes but I still had sound. I
took the rear cover off and blew all the dust off with compresed air.I
did this for a few times over several days nothing happened.I also took
off the rear circuit board that attaches to the tube with a round pin
socket and blew that with compressed air and put it back on. The TV has
now worked for two days without the picture going out. It
worked!!!!!!!!!!!!!! My TV is 9 years old.
I have a sansui 19" LCD TV+DVD I had to attempt multiple times turning the TV on to get a picture. The sound was fine. This kept happening when I would go to turn on the set the TV kept playing fine with picture & sound but after the 2nd attemts I turned it off & then tried to turn it back on which took multiple attempts, it kept playing for a few minutes then the picture went out but the sound was still there. The set is not yet 2 years old.
The model you listed, F27650 uses the new ATC113 series chassis, which is only about 3 years old. The ATC113 chassis is not known to have snowy issues, but if yours is then I would suspect that a solder joint is loose in the tuner. If your set is actually around 9 years old, then it might perhaps have the notorious CTC175 - CTC187 series chassis, which went snowy all the time due to cracked solder joints on the shield grounds around the tuner and microprocessor. In either case, some good quality resoldering should cure your trouble. If you have never done fine solder work on PC boards with small surface-mount parts, allow a qualified tech to handle it for you.