This Tv has no Picure, thought it sounds like it turns on, the led flashes green then stays yellow and emits a sound as if it was working, opened the back and the boards have the light leds on, could this problem be related to either the power suppy, the Y and Z boards or do you think it might be a video problem? I would like to hear you opinion
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Check and replace damaged component/s at it main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do asearch by type in the brand name of your device at its search box. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis.