I just worked on one of these. After you take the back off, the audio board is located at the top of the set in the center. The board is packed with 2 & 3 watt resistors & loaded with bad solder connections. Also check the cable connectors on the audio board.
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In this case, it will be best to contact any service technician. These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power led, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/
Blinking codes details to many popular brand TVs are given. Surf the site with patience.
The tv have a long board call a LCD inverter board.This long LCD inverter board is dead.That why,the tv have picture only flashes like a min. than,died and have sound left only.The LCD long inverter board help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish long LCD inverter board for the replacement.
try cleaning the bulb dust build up will over heat the assembly and shut the picture and sound off mine did the same thing and now it works great like new just follow the manual on taking the bulb out use air in a can too clean it