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The tv a/c power cord unplug,replug it back tv work normal again for awhile.There ur answer the tv power supply board is the causes and the problems.That the board where the power a/c cord plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.
Issues with back light: Please do not attempt to diagnose if no competent. Do at your own risk. Check for 24 Volts power to the inverter board No Power---Check Power Supply Power Present--- Verify status voltage 3v to 5v on inverter board harness (plug) Replace Inverter Board
The problem is associated with the power supply that cannot run under load. The showing of picture for a brief period of time indicates that the main board, ballast, inverter and panel drive are all OK. The unit turns on but the power supply cannot sustain the power requirement of the unit and shuts down. The usual culprit on the power supply are blown or bad capacitors. Check the power supply for such capacitors. If no apparent damage or defect is found, replace the power supply.
The problem lies within the unit. You have a hardware failure within the board. The power supply board needs to be repaired or replaced. If you are a handy person, you can easily swap the power supply board.. If not, bring it you to local reapir shop, they will find the parts and replace it for you.
I wish I had a better solution like an easy fix for you. Sorry, but on hardware failure, there is no easy fix.