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Sounds like back-light inverter fault. Shorted component/s at it. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
There is a manual switch on the bottom of the TV. Flick it on and TV screen should come on. The power light will come with this switch off but the screen won't. It had me cursing for a while until I saw the little switch.
Have ordered a new power supply PCB as too many parts need replacement. Best to buy the whole lot. Ventilation seems to be an issue with this unit, I am thinking of installing a small fan at the back to cool the voltage regulator and main transformer. Thanks.
This is exactly intermitent problem, It needs to be trouble shoot at the repair shop if the problems occurs from power supply or high voltage.It needs a lot of test and equuipement to be accurate.And also the specific parts.