SOURCE: sound yes, but no picture on tv
If you have sound on the stations this is a problem in the display. Take bright flashlight and hold it against the screen. Look for an image around the edge of the flashlight. If you see an image then it's one of three problems;
1) The inverter board is bad.
2) The CCFT (cold cathode fluoresent light) are bad.
3) The power supply to the inverter board is bad.
Someone knowledgeable in electronics can replace the bad part(s).
SOURCE: tv is about 4 years old. Suddenly developed two
Your plasma screen is made up of 1080 verticle lines and now a few of these lines are not working. This is the screen itself and needs replacing.
SOURCE: when i turned the tv
Youy may have bad T-CON, Power supply, LCD panel. http://www.scribd.com/doc/25276757/E40951307-TCON-Troubleshooting-10-22-09-OPT PDF download: http://www.mediafire.com/?zzjygannjty Inside the TV: http://s807.photobucket.com/albums/yy352/budm/SAMSUNG/Samsung%20LN-S3251D/
Learn about T-CON/LCD panel failure mode:
Try this when the screen goes black:
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there is some troubleshooting you will have to do to find out the causes of the problem you are having.
If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:
Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
You can still use the freeze spray Donald mentioned to cause the fault to come back once it is gone.Using this stuff carefully and allowing each component to 'soak' for 20-30 seconds before hitting another should allow you to narrow it down.
If it is in fact one of the board-edge parts of the display (which it could well be), the whole display may be the only 'part' LG will replace and you will shudder when learning the cost of it.
If you do find the right part or area and it is the display, you might try the site below to save some bucks; this company buys overruns and parts out units:
Shop Jimmy
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