My Sony Tv has snow for first 3 to 7 minutes when first turned on then once the picture comes on is fine until tv is turned off then same problem each and every time when first turned on. Tv is 27 in cabinet model about 10 or so years old.
Probably dry solder joints in the tuner section.
When the set warms up, the faulty joint/s make contact, then lose contact again when it cools down.
The tuner section is usually contained in a small metal box which in turn is mounted on the main board, where the antenna connects.
Standard-size soldering irons are usually way too large as the components are the surface mount type and require a SMC iron.
Using a standard soldering iron can easily short out other components. You may also need a circuit diagram, a multimeter and/or oscilloscope and obviously, a full understanding of how to use such test equipment.
Apart from this, there are extremely dangerous voltages that remain in TV's, long after they have been turned off (around 25 thousand volts). If you are not experienced in TV chassis repair, I strongly advise against attempting any DIY repairs for safety reasons alone.
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Thanks.....but can you tell me where the tuner section is and how to fix it? I have read before that the solder joints may be faulty and I bought a cold heat soldering gun and electical solder but have been leery of taking the back off of the tv and trying to repair it.
However, it is almost impossible anymore to find a tv repairman so if I could get some assistance in what to do I could try to fix the problem myself.
Thanks for the info. Needless to say, I will not be trying to fix it myself. Appreciate that you pointed out the hazards.
I apparently have the same problem with my 1994 model Sony KV20S10 Trinitron color TV. Only my TV make take "MUCH" longer then 5 minutes to come on. When it does come on the picture/sound quality are near perfect. "Keever" responded to check the 'cable-off' item in the menue since I'm on local antenna but that was done longgggg ago.
Has your problem been corrected at this time? Check my Bill Bones question.
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