A i have a sharp lc-42sb55e and it has 2 kind of problem which are rotate each other. 1. problem: suddenly turn itself off and after 1 second it turn on itself and it repeat for a long time and once it suddenly ends. first i thought it is overheated, but it makes it when i turn it on after a day too. 2. problem: suddenly it start swiching betveen the plug ins (HDMI 1, HDMI2, HDMI3 PC, TV, SCART 1...) rapidly. once it sudenly ends. zesterday it made it for 3 hour. i hope u cane give me some solution, thank u
Could be the button board which has power and input buttons. If they are stuck down or failing electronically they could be telling your TV to continuously turn off or change inputs.
SOURCE: Sharp LC-26D43U Power light flashes and unit won't turn on?
It's a power supply related problem. When it turns itself off, this it called protection mode. The TV automatically turns off to protect other parts form being damaged.
The most common problem is the Power Supply Unit or the Backlight Inverter Board.
You may have to take the TV to a repair shop to find out which one is bad. Paying a repair shop to replace the board for you maybe more than the TV is worth. If you let them diagnose it and you replace the bad circuit board yourself, it would be cheaper.
Here's a place I use to get parts for TVs:
http://www.shopjimmy.com/catalogsearch/result/index/?q=LC-26D43U&p=1
The problem is the repair shop may charge you double or three times of what the part costs at the web site link above. Then, plus labor. I just want to save you money. :)
SOURCE: My new sony 26 inch bravia lcd tv suddenly loses signal
If it's new, get it replaced. Video board problem.
SOURCE: My sharp LC-37d62u display problem
This problem very common in sharp tv.The POWER,OPC flashes.First turn on have power LED indicator light stable at all? Tries the power again couple times will have backlight come back on,than it will work.Not at all more than 5-6 times than ur main turner signal board is the problem,must replaced.
Testimonial: "Took a part back panels looking at the circuit board power capacitors, plugged in TV to power outlet, and powered up normally."
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