Loosen solderd part connot be seen.. you have to test and reheat the board.. this will take time but this is the best solution...after reheating the board then find no result i suspected to check the H.out somewhere near the flyback.....gud luck!!
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Since the set appears to "recover", it suggests either a poor solder connection or bad cap somewhere in the power supply. The 7 blinks indicate the problem circuit is in the horizontal area. Check the regulator (STRxxxx) IC in the power supply. If you do not have experience working with TVs, please refer this repair to a shop. The regulator IC costs around $25.
hi there, this may seem like a sstandard problem, but differs from mfg. to mfg. in the sony tv's it is usually an open cap in the stand-by power supply, since you werent specific in your problem, there can be many solutions even for a single series or group of tv's even within the same mfg. give me specifics and i can answer more precise. hope this helps even a little.
If you dont here anything then it sounds like the switching power supply or the horizontal output circuits not starting up. this requires troubleshooting with a variac, as well as maybe a scope. If your not trained to work on HI Voltage circuits you should seek assistance with this repair. Theres HI voltage inside these sets even after they are unplugged for a while. sorry i couldnt be of more assistance.