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Yes, this happened to my Samsung. It was the high voltage circuit on the power power. The TV has a chip that check all the circuits on all three boards. When a circuit is low, then it won't turn on. I checked 380 volts at the capacitor connected to the high voltage transformer. It should have been at 390 volts. I took out the 100 uf rated at 450 volts, but only have two capacitors lying around: 150 uf and 220 uf rated at 400 v. I connected them in parallel make them 370 uf at 400 volts, and the TV is now working fine.
Unplug,replug the tv back like 24 hrs later.That the whole tv is resetting itself everythings.Tv now should be working again.If still have the same problems,than ur tv DM power supply board is have dying parts,must repair the tv DM power supply board to fix the tv.
The power supply section is having trouble.
Common possibilities are:
- Convergences amps have failed overloading the supply
- High-voltage section (flyback transformer) has failed
(happens sooner or later, about 8 years typical))
- Power surge has popped the power input circuit.
(Fuse, rectifier diodes, turn-on relay etc)
- One of a hundred of electrolytic capacitors has failed
short overloading the supply. They dry
out with age, are cheap to replace, but hard to find which one it is.
- Or any of many other possibilities.
In short, you need a experianced tech to troubleshoot this.