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Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
pls. check if there has 5v ic regulator... also check the open non- electrolytic colored yellow or orange tantallum capacitor near the talc switches and memory ic.if i'm not mistaken.... the capacitor value is 2.2uf 50v.
What is the number of regulator IC uses with the power supply to this set? If you wish to get details about how to troubleshoot SMPS power supplies, check this link. There is a recent post about it. Check it.
your explanation is saying that you have a dead set.it can be what you mention.but check your power regulator.or the following componets.horizontal output transistor,flyback,10 mf cap in the power supply and there is another 10mf at the input of the flyback along with a diode.there is also a resistor in the same area that you need to check.if that does not not solve your problem take out the microchip the number on the board is 506 when that is damage it can cause your set to dead.around that same ic there is a diode and a little transistor check them if they are shorted they can be the culprit that damage your microchip ic.
Check the swithed mode power supply section. Some sets uses Ics for control the power regulation, while others uses transistors as oscillators and choppers. If the power to the oscillator section of the SMPS is absent, the supply system won't wake up. So many reasons are there. You just check the resistor, usually connected from main DC rectified supply, to energise the oscillator section of the SMPS. In most sets it may be two resistors in serial, usually 270k 1W*2. If any one of this get opened, the power supply will not start up. Check it first and preceed. If the set uses Ic as regulator controller, check the positive supply voltage at the respective pin of the Ic.
This could be several things, but most likely a burned loose resistor or bad solder joint.
All of which causes an inoperative power supply with the result of having a "dead" set.
It would have to be checked out to find the problem.