I am currently having the same problem and I have had my TV for over a year - I don't know if there is a fix and I am not sure if I feel like taking it to a TV repair shop for them to play with it and charge me. Have you come up with a solution at all??
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Press the the cursor key up followed by down and power the TV off with the remote or the TV itself. Please use the original remote for this. Unplug the TV for a few seconds...replug and power the TV on. The second thing to try...press the cursor key left followed by the right key. Power the the TV off with the remote or the TV itself. Unplug for a few seconds...replug and power up the TV. Some of these TVs left the factory in the service mode. The fix is pretty simple. Thanks asking and show a few hands of support!
The most common problem is the Power/Backlight Inverter Board. There are 6 mini transformers on the board, one goes bad and the TV will turn itself OFF automatically for " Protection Mode". Replace the whole board or replace the bad mini transformer.
Whole board, BA71F0F01042
Mini Transformer, LTZ2PC0MS008
one of the ballist transfomers is failing on the inverter board your should have a tech replace the bad one easy to find the bad one by a process of elimination
unplug all but one lamp turn the unit on and watch for the lamp to light for a second if it does go to the next by pluging it in may sure you umplug the one you already tested go through one at a time
I have a 32" Emerson that did the same time.
The problem with mine was one of the Power Inverter Transformer when out. It used 6 of them to power the LCD screen.
I believe yours will have more than 6 since it's a bigger screen.
The Power Inverter Board is all one piece, the best place to get one at a good price is Shopjimmy.com