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Re: no picture or sound
The most common reason for no power on your set is a shorted hori output NTE 2353 , and right behind that part is a 1200pf 2kvolt capacitor check it also check out STK-392-150s one of them may control part of start up.
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How many times do this standby light blinks at a time of switch on? These blinks are fault indications. From the number of these blinks, you can get an idea about the faulty circuit section inside it. Count it. If you wish to get more details about the blinking codes to Sony TVs, check this link.
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.
Sounds like you have bad solder connections on the 5 and 9 volt regulators on the power board. They should be marked 7805, 7809, and possibly 7812. The 78 on these IC's mark that they are positive regulators and the other 2 numbers signify what voltage they are. Very common problem.
If you have sound but no picture it means that your power supply and tuner are working correctly. The number of times the timer LED blinks is the code for the problem with the picture. The computer will stop the picture and blink the timer LED if the vertical circuit stops working, if the picture tube is too weak or if the horizontal sweep has stopped. The set should be serviced by a qualified tech familiar with Sony sets.
it seems that your tv has a problem in horizontal circuit (with sound but no pictures). since you moved your tv from one place to another, the tv might have shaken causing to loose some soldered components particularly in horizontal circuit. if u have exprience in this stuffs, try to resolder the circuit, if not, bring it to a service technician.