Still have sound and backlighting, but no picture
A black TV screen may just be a sign that the TV is turned off, although if it is producing sound then you know that's not the case. When your TV has a black screen even when it's on, it could be possible it could actually be your external device and not your TV.
-Reset ALL components by unplugging them about for 5 minutes including the TV. -Be sure all COAX CABLES and HDMI CABLES are tight and properly connected. -If you CAN pull up the TV MENU when you have the black screen, update your TV's firmware to be sure your TV is up to date and rule out the TV as the problem.
SOURCE: Samsung LNR408DX/XAA Powers on with sound but no picture
I think you need to exchange the Main Board.
SOURCE: LCT 2662 after caps replaced I loose backlight.
make sure the caps you installed are the exact replacements. Changing voltage capacity or timing will cause the circuit to fail.
SOURCE: samsung lcd tv no picture just sound
While this is not a permanent solution, we've fond it helps... We have a Samsung LCD that does not turn on when there is too much humidity in the room. This only happens in the summer when it gets really humid. We moved our dehumidifier next to it, let it run for around 15 minutes and the TV turned on again, no problem. Lately, it's been raining alot so it's very humid. We've gotten into the habit of leaving our dehumidifier on through the night on low and we've had not issues turning on the tv since then. This is a hastle but it's either that or buying a new tv.
SOURCE: Samsung ln-t4042h turns on, plenty of sound, backlight works,...
Check the fuses on the T-CON board and also verify that it does have 12vdc feeding it. If you look at your screen in darkened room you will probably see slight glow on the front of the screen.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
SOURCE: LCD TV Has Sound, Backlights Work, but No Picture
I have been having the same problem with my LG. people say there are bad capacitors on the power supply board. I don't have the know how to replace them and don't have the money to pay. I can get mine to work by blowing hot air with a hair dryer into the back of my tv through the vents over the board. Heat it up for a couple minutes and turn it off and then back on and the picture comes back. I just never turn the set off now.
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