Do you see a horizantal line across the screen before the set goes off. if you do, you have a problem with the virtical ic. it has to be changed. let me know if you see the line across the screen and I will show you what to do
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Please try to switch the TV on with the help of Remote control when the stand by timer is on.
Also get the On/Off switch checked up. It may not be making contact because of loose spring. You may have to get it replaced. Since your stand by timer is getting lit that means the power is coming to the set and the safety fuse is OK. The switch is not making the contact.
The Sony error codes go up to 7, so when the standby light flashes 11 times it usually means that one of the clock or data lines deep inside the set is shorted to ground. This is not fixable from the front or through the remote, so the set should be serviced by a qualified tech familiar with Sony sets.
If your Sony TV is hooked up to a good signal and is set up correctly, but only clicks and has no picture or sound, and even the menu will not show up on the screen, then it means that the main power supply has stopped working. I usually find that a small crack in the solder joint of the horizontal drive transformer or a shorted flyback will cause the large horizontal output transistor to short out, and this shorts out the switching transistors in the main power supply which then causes the Sony 0.1 ohm fuse resistor to open up. I have also seen power surges or power failures (brown-outs) cause the switching transistors to short out. In any case, the set absolutely should be serviced by someone experienced in repairing Sony TV's.