Hi James,
First of all, thank you for consulting Fixya.com regarding on your LCD TV problem.
The symptoms you've described is one of the common problem not only on LCD TV's but almost all types of TV's including the LED, Plasma, DLP, and CRT. This is caused by faulty (leaky/dried) electrolytic capacitor in the power supply board. Leaky/dried electrolytic capacitor will dropped the normal operating output voltage of the power supply board and will disable the unit. In the first stage of the symptoms, warm-up will make itself stable like leaving it plugged to the outlet, wait a few minutes/hour, hitting the power button key several times before it will power up but the symptoms will get worst as time goes by, the unit will not react at all once the leaky/dried electrolytic capacitor is totally faulty.
Electrolytic capacitor act like a power reservoir, the unit will work fine once the capacitor reach(charged) to minimum power requirements needed by the circuitry that's why you need it to warm-up (if the capacitor is partially faulty) or else the circuitry will not work.
Leaky electrolytic capacitor has a physical indication of fault like bulged, dome at the top and can be easily identify through visual inspection. See sample picture below.
Open the back cover of your TV and then inspect the power supply board (this is where the power cord's directly connected). Once you found capacitor with bulged or dome at the top, replaced it with same capacitance and working voltage that is printed on its body. Watch the video below for more info on electrolytic capacitor.
Dried electrolytic capacitor has no physical indication of fault. You must have a capacitor checker/tester to determine its condition.
If you don't have necessary tools and test instrument and can't troubleshoot the unit yourself, I would advice you to replaced the entire power supply board. It is more convenient if you are going to DIY because no troubleshooting and soldering required. All you have to do is to unplug the TV from the outlet overnight, take off the rear cover, pull-out all connectors to the power supply board, unscrew the board, put in the new board, re-insert the connectors and you can now try the unit.
You may obtain the board online, try to check the board on ebay.com or shopjimmy.com. Just type TV's model no. on their search engine to view the available boards. The power supply board has a part no. that is printed on the board itself, I would advice you to check it to ensure you will get the exact replacement online.
Watch the video below for more info regarding on the symptoms you've encountered right now.
http://www.thehdtvworld.com/808/how-to-repair-your-plasma-tv-with-blinking-led/
Hope I helped you.
Have a nice day!
Ratings and feedback are highly appreciated!
Kind Regards,
Jdvillanueva
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