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Re: no pic but sound ok
This model is equipped with a self-diagnosis feature to help with diagnosis of shutdown problems. To activate this turn the unit on let it shutdown then press the input/device and menu buttons on the front panel simultaneously and hold them in for 5 seconds after 5 seconds the power LED on the front panel will blink a two digit sequence
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Fault to its main board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
T'Con board fault. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
He was wrong... HDMI is just an audio/video format for high quality video and sound. That cable also contains the sound that goes with the picture. If it has sound but the picture is not there then the HDMI cable is probably OK. A simple way to trouble shoot that is to use a different input. For example Component Video. You will need a different cable for that. It only contains the picture (three wires), then change the input to component video. That's a menu setup. If that restores normal operation then your video is just fine and probably the HDMI cable is fine. The trouble may be in the connections behind the jack on your TV. They are subject to mechanical stress when the plug is inserted and removed. They should be fine but if the connections weren't perfect from the factory they can cause microscopic cracks that will show as things like no video or intermittent video. You can bypass that connector by using a different audio/video input. If that fixes the problem then leave it that way. If it doesn't it's still likely to be a cracked soldered connection but elsewhere in the set.
Try it on another pc and if it works fine back up your pictures.
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First thing you should try is unplug the set for several hours. If you have the same problem, then you are going to have a system control issue and or a standby power supply issue. These problem, unless you know how these circuits work in a TV set, will need to be looked at by a trained tech. Good Luck