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There is some short circuit in the horizontal output section inside your RCA tv. The blinking of ztandbylight twice denotes it. it may be due to a short in the horizontal output transistor, or defective LOT [Line Output Transformer]. Remove the horizontal aoutput transistor, by resoldering it out. It can be located very near to the above said LOT, screwed on to a metal heatsink. It is a three terminal device usually black in colour. After resoldering it out, switch on your TV, and see whether the standby LED blinks or not. If not, replace it with a new one, and switch the TV for a short time, say 3 seconds or so, and switch it off, unplug it from mains supply, and feel the heat of the transistor replaced. If it overheats, LOT said above is defective, and should be replaced with same type and number. OK.
Sounds like a probable shorted Horizontal Output Transistor (hot) Hopefully thats all. Sometimes the flyback will fail as well. If your not familiar with electronics I would recommend a tv shop repair. If its just the HOT transistor average repairs are 75-110 depending on your location.
The green light indicates that it is getting power from the outlet ok.
The clicking is the power relay trying to turn it on but there is an
internal fault forcing it to shutdown. You either have a power supply
problem, horizontal output transistor (HOT) is shorted or a bad flyback
transformer. In any case it can most likely be repaired by a qualified
technitian. If it is the flyback it may be expensive.
The Hor Output transistor is connected to the Line Output Transformer. This transfromer provides a lot of voltages around your TV set but includes the very high voltage to the Picture tube...
These transformers are specially tuned to resonate at a certain frequency,
The Hor output transistor needs to match this frequency....so if the wiring inside the transformer is shorted by "just a bit" the picture will be visible but the transistor is struggling to match the transformer impedance,from the mismatched tuning...so the transistor draws more current from the power supply.. runs hot then burns out...
Usually manufacturers provide a Trip circuit that detects that an overload on the power supply is occuring and cuts the power to the Line output stage ...this is usually detected by a clicking sound within the power supply its called hiccuping.
If some one has altered the correct setting on the power trip circuit then the next thing that happens is the Transistor goes Blooooey like in your case.....
So to save you a lot of money replacing the output transistor
please replace the output transfromer as well next time...
But please... please... re-check the power supply trip circuit to save you a lot more expense in the future....