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Re: no light on lcd screen
Check if the back lamps are still on when you lose image, all you have
to do is get close to the screen and make is totally black and if is
not that means you have a back light working, but if the back light is
gone you may have a defective panel.
talked to samsung TA about
the same problem I had and the recommend to replace the power supply
first to confirm a defective panel because a panel is quite expensive
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Do this first. Shine a flashlite on the screen to see of you can see a picture with the TV on and listening to a program. If you CAN see a picture the backlight drivers are bad If no picture the T-con board is bad. You can get parts from here :www.shopjimmy.com
Sounds like maybe power supply, but I would check with flashlight 2 in from screen when the green light comes on to see if you have a picture, if so then you have a bad inverter board, if not then power supply problems. You can look for bad or bulged caps in PS
The tv have a long board call a LCD inverter board.This long LCD inverter board is dead,that why u have picture flashes few min than dies,have sound left only.The long LCD 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.
When the screen goes completely black, shine a very bright flashlight closely at the screen. If you can see the image, then the most likely problem is that the backlight inverter has failed.
The inverter is a circuit board that works like a flourescent light ballast. If the inverter fails, there is no backlight, and the screen is black.
Since the invertor is a high-voltage component, I would also listen for any unusual sounds associated with the failure: e.g. buzzing, whistling, popping.
To rule out some sort of connection failure, see if you can recreate the failure mode when using the TVs internal setup menu. The setup menu does not rely on any external inputs....of course neither does the volume control or channel indicator on the screen.
I think your LCD TV lost back light that is why you have sound but no picture to see it as LCD TV requires back light to present picture on its screen. Please intimate model and brand of your LCD TV to provide you more info.
You do not state your TV is plasma/LCD or the older tube TV.
Anyway, if your TV is plasma, the problem comes from Y-board.
If it is LCD, use flash light shines to the screen you will see pictures moving there. This case the invertor fail.
The old one have many components involved. It is hard to tell without details.
LCD TV TroubleshootingThe defective LCD TV may have the following common symptoms:
Symptom: No picture on screen but LCD TV still has sound. Solutions: The problem is cause by defective inverter. Replacing ivnerter will solve hte problem. Symptom: Screen flash on and off between 1/2 to a few seconds, but power indicate light stays on and TV still has sound. Solutions: The problem is cause by defective inverter. Symptom: Blue Screen but no picture Solutions: The problem is cause by defective Main Board(AD Board). In some cases, this problem may cause by the defective Screen Controller board. Thsi board is mounting on teh back of LCD TV Scree. Symptom: Power light stays on but no display and sound Solutions: The problem is cause by defective Main Board(AD Board) or Power supply board. Symptom: No Power or Power indicate light does not lits Solutions: The problem could cause either by defective Power supply board or defective Main Board(AD Board). Symptom: Screen is half dim and half bright Solutions: The problem is cause by defective LCD Panel.It needs to be replace.