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First check the power supply of your TV,multimeter the export voltage of power supply.if it is defective you can replace it.
if not you need check main boards,and inverter boards
From Wisiny.com can find those parts,power supply,inverter boards and t-con
Sounds like a possible "cold" solder joint on one of the circuit boards.
Majority of these intermittent problems is caused by either a broken solder joint and can be fixed if you inspect the different boards that
are present in your unit. Use a magnifier to help you find these "cold"
or "broken" solder joint(s). You will also need a soldering iron (~40W)
and some solder to reconnect/reflow these broken joint(s).
The Innovage Jumbo remote control manual does not list any TV's by the manufacturer Vision Quest, but that does not mean your TV is not compatible with another brand's control codes. I recommend using the auto-search function to see if any of the remote's TV codes work with your set.
To have the remote try each TV code it knows one at a time, follow these steps:
Turn on your TV.
Press and hold the CODE SEARCH button for at least 3 seconds until the red LED lights up and stays lit.
Press the TV button on the remote so that the LED blinks once and then remains solid red.
Press the ON/OFF button slowly and repeatedly until
the TV turns off. The LED will blink once each time you press the
Once the TV turns off, press the ENTER button to store the code and the LED will turn off.
I'm pretty sure that your unit uses the 3V cr123 Lithium battery. You can get it at RadioShack. You can always take it down to radioshack and pretty quick you will find the correct batt.for the unit. Do not use rechargeable batts!