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Re: will not power up
This sounds like a HV shutdown problem. I would check the IHVT (Integrated High Voltage Transformer) and the HOT (Horizontal Output Transistor) for shorts. This is a common problerm
I hope this helps,
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that high whine sound you hear is the circuit crowbar most likely as its shuts down the high voltage because of a bad voltage detected in the circuit. simple for a tv tech but not worth it to the average peroson to fix
If the high voltage comes up and goes right down something in that area is either shorted , open or bad---only thing in power supply that could cause this is if the main voltage (130 volts plus to the high voltage area is HIGH---the high voltage will go excessive and shut the set down--xray protection.
for sure your tv has power as indicated by your flyback hissing it also indicates leaking high voltage that might destroyed your vertical or any other parts near your flyback ,the flyback itself should be replaced for its high voltage arcing can ruin so many components
Flashing lights on most TV's indicates a faulty voltage somewhere in the power supply or other voltage sensitive section. Like the "check engine" light on most cars, repair will require a trip to the shop. Get an estimate first. In the new world of disposable electronics the cost of repair may exceed the value of the set.
The main power fuse inside the TV may have blown. The rear cover must be removed to check it. Unplugging the power cord from the wall outlet is the first safety item. Finding all the right screws to remove the cover (without taking out some you shouldn't) is sometimes tricky. When you remove the cover the power cord will still be attached inside, so remove the cover carefully. There is a danger of touching residual high voltage near the picture tube. Carefully look for a fuse near where the power cord attaches to the circuit boards. Often the fuse will be obviously burned open (the small conductor inside the clear glass is melted or the glass is blackened). Replace only with a fuse of the same type and amp rating. Putting a higher amp rating fuse or slower acting fuse can have costly and possibly dangerous consequences. Be sure to plug the power cord in when you do your test with the new fuse. If you haven't done anything close to this before, you may want to refer this job to an expert.