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Re: After i power it on, there is no pictures, no sounds...
Does the red light come on? Do you hear a relay click, Have you unplugged and plugged the set back in? Short of opening the set up you probably have a power supply/deflection issue and will require a tv technician.
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Have you made sure the appropriate signal source is properly connected? Could it be you have selected an invalid input source? Use your remote to cycle through the Input options. Wait 5 - 10 seconds on each option to see if a picture appears.
Try changing channels. Power light is on, then it means there is power coming in, but no video signal is being received (audio signal is good). Try this: turn off the TV, take out the power cable out from the power socket, wait for 30 seconds, then plug it back in, and turn it on. It should work fine. But if not, then there might be a problem inside the TV itself. Go see a local TV technician.
It sounds like you may have a power supply problem- (HV Power supply). I must ask if you have sound or not? If you have sound it is the HV supply only if you do not have sound the Low Volt power supply and possibly the HV power supply/Horizontal section has a problem. I would suggest that you take the TV to a qualified TV repair shop.