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Re: Have blank screen with sound. Flashlight test shows...
I hope I can help with this. It could be either the colored cables are not positioned correctly (they should all be on the same row) or it is on the incorrect TV Input. This can happen when we have other devices connected to the TV such as CAble box, gaming console (xbox, ps4,wii), dvd player, etc. The fact that you said the HDMI cable works fine and shows picture, it tells me it has to do with those colored cables.
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Is your computer connected via the HDMI cable? If not pull up menu and change to another input type. If it is HDMI, check cable ends. You can test by plugging into a Blue ray player and see if video plays on monitor as a test method to verify video coming from computer incase your video card has died for some reason..
Your monitor is going into sleep mode since it can not see an HDMI signal coming across the input. Check your cable though.. sounds like the biggest culprit to me.
The power supply-inverter board is probably at fault. Remove the back cover and locate the standard ac power cord connector. The board that the power input connector is soldered to is your power supply - inverter board. Check the electrolytic capacitors on the board. They probably went bad. A visual inspection is usually enough to find out which ones are bad. They will be either bulging or cracked at the top and leaking fluid. I usually replace all of the capacitors that have the same rating whether they look bad or not. Will save you another repair later. If the caps don't look bad, you can take the board to your local tv repair shop and have the caps checked with a esr tester. It's more accurate and they can be tested with the caps in place. Hope this helps.
i have samsung 22' lcd series 4 tv but i connected it with the dvd player via hdmi it shows mode not supported. but the same dvd works very well on another samsung lcd of same configuratition. please help me