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Y sus (sustain) board or main power board has dry capacitors or dead transistors or even main chip is dead, but to know more accurately you need to count the red light flashes. Google "red blinking codes" should find the answer, ebay sells Y sus boards or power boards around $125 (cheapest) for plasma TVs.
the problem is in the power supply most likely. The overvoltage protect circuit is causing you not to be able to turn the tv on. This is common to all tv's. Solution unfortuantely is get another tv unless you know someone who can either work on or replace the internal power supply
Generally these type of problem occurs due to atmosphere contains moisture content. Even if it happens in warm area i suspect fbt leakage. Since this is high voltage transformer it can be serviced by qualified technicians only. Red light flashes indicates the tv in protection mode to avoid severe damage due to some short circuit. I think it is helpful to you
tv wont turn on when i hit power it makes the clicking noise like it is going to turn on, but never does and the red timer light next to the power button just flashes. help! trinitron kv29f1u only clicks and blinks
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.