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It sounds that there is a direct short circuit in anywhere in circuit board. Most probably, it might be to vertical sweep output section, in Sony TVs. Here you noted that the standby light blinks. Blinking of standby light to Sony TVs are fault indications. Count it, and check this.
Here's my suggestion , unhook all the external components to the TV
and leave the TV unplugged for more than a few minutes (a
day/overnight). The next day plug the TV into the wall outlet (not the
powerstrip) without anything hooked up to it, and turn it on. See if it
comes on. Sometimes unplugging for a few minutes/hours is not long
enough for it to reset itself.
Blinking of standby light in Sony TVs are fault indications. You just count the exact number of blinks occurs at a time after switch it ON. Switch it ON and OFF by its front panel power switch, and not by the remote control handset. Do this for at least four times, count the number of blinks, confirm and inform me. I can then locate the fault section of your Tv, seometimes even to the exact point of fault too. OK
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.