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please check your power inverter this is common problem of all LCD type. change bad capacitors from secondary power supply near SMPS. hope this can help you.
Sounds like the Main Mother Board is the problem. Basically, it's the brain inside the TV. Controls and functions is that board's job.
Soyo parts are hard to come by. You can try running the number off the mother board on the internet and maybe a supplier will pop up.
Their Soyo.com web site isn't working. So, I'm thing they maybe out of business.
If you have some electronic experance and if your lucky, the heatsink on the chip processor is the problem.
I HAVE FOUND 2 2200uf CAPS ON THE POWER SUPPLY BOARD THAT ARE PUFFED UP. CHANGING THEM USUALLY SOLVES THE PROBLEM. THERE'S ALSO A RESET BUTTON ON THE MAIN BOARD YOU MAY NEED TO RESET AFTER CHANGING THE CAPS.
Long story short: Had the same problem with my Soyo. Thought it was the power supply board problem that everyone else was reporting. ordered one. Plugged it in. Did not work. Inspected the Main/Logic board and found what looked like a black button that could be depressed. It is located to the right of main processor on the board. You can't really miss it. With the TV plugged in, I pressed the suspect button. The TV made a buzzing/clicking noise for a few moments and the stuck blue illuminated power button faded away. Curious by this, I pressed the power button and low and behold the TV comes to life! Looks like I found a "reset" button which seems to have fixed my problem. Thanks Soyo for not bothering to mention that such a button exists. I hope the rest of you have the same good luck. In the event you are still in need of a power supply board, email me. I have a spare now it seems. ;)
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