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Proton LCD TV, Hi, most LCD's and Plasma's have a cold/ hot circuit and the board for video and audio are the same usually it's a main board but before going through all that check to be sure that it's not a setting or volume adjustment. older model proton TV's exchange the main board these usually go bad IU would search any auction sites for a similar model with a broken screen and take out the needed parts for this fix, otherwise your better of getting a more updated LCD TV good thing is that they are way cheaper now
If sound is coming and showing no display then its display problem that comes from card situated inside the LCD. So go to nearest LCD repair center and check out this.
Check the backlight inverter the is the part that turns on the TV light so that you can see the picture. If there is power going into it usually 24v DC and the backlight is not turning on then it's provably your backlight inverter that is bad. If you look at it it has a part number on it that you cna use to order anotherone. You can order it from www.interliquidparts.com
Have you asked proton about the bulb or inverter or power supply. Proton is going to be the only place to get them. Soory to have to tell you but proton doesnt have good customer service.
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