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Try unplugging the TV.. After you plug it back in it may be OK. I had a similar problem were I could not turn on the TV (JVC). The owners manual specified in the troubleshooting section to unplug for 1/2 hour. I left it unplugged overnight and the next day plugged it in and it was fine.
usually after 4 or 5 yrs EHT ( transformer that supplies voltage to tube ) becomes weak - then TV won't get ON.. means no picture no sound but LED blinks - in some TVs along with EHT 1 or 2 components like resistor, transistors, etc will also gets deffective - so solution is TV circuit board has to be checked to find whether only EHT is deffective or other components are also deffective - price of EHT will be between Rs.250 (US$ 5) to Rs.600 (US$ 12) - iam service engineer (computers, laptops, printers,etc) - bangalore - domlur - 09986222774 - firstname.lastname@example.org - if you are in bangalore then you can call me for service - i think you are living somewhere in america /australia..... - problem is simple but i don't have any idea about EHT COMPONENT 's price & service charge in your place.......
mine does this same thing and in the manual it says that this is an indication that the bulb is about to need replacement. I did this and still the same issue. The only small solution I have found is to disconnect power and try to turn it on until it finally does. I am searching for a REAL solution though.
On some models the reset is unplugging for a minute or two and plugging back up. Otherwise you have a blown fuse where the power goes in. If you decide to replace the fuse do no go over 5 amps. If the replacement fuse blows there is a short in the set and needs a repairman.
dont be afraid, remove the fuse and have it replaced. but be sure to unplugged the unit before doing so and replace it with the same value. if the fuse get busted again, there is a short somewhere in power supply circuits or the horizontal circuits and its time to bring the unit to a qualified service technician