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Here's the test. With the TV on shine a flashlight on the screen. If you can see a dim picture the backlight circuits are bad. If you cannot see a picture the T-Con board is bad. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy
Hello Its backlight is not working. Check the CCFL tubes, and it backlight inverter board for fault. Backlight inverter board will look somewhat like this. If this board has damaged, CCFL lamps won't light up, and there will be no backlight. OK.
I'd check the battery first. I've seen the post break loose from the batteries in many Sportsters and leave them dead on the road. I've only seen this happen once on a Big Twin. Why? I have no idea. If nothing on the bike works, this may be the problem. If everything else works but it just won't start, I need more information. Does the starter engage and the engine turn over?
The inverter/backlight combination isn't the whole picture. The inverter powers the backlight, but the inverter is controlled by a signal commonly called "Brite-On", which comes from the motherboard. If the "Bright -On" signal from the motherboard is missing,then the inverter (and thus the backlight) won't work. The problem you are having is on the motherboard. here's a link to a datasheet of such a device:
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