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Re: LG 50LN5200 has good sound but no picture which...
Go to Shopjimmy.com and search by model number. If the Power supply/LED driver board gets replaced and doesnt fix the problem, It's very possible that the LED panel is the problem which is usually more expensive than it is to just buy a new TV.
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The backlight leds need replacing, you can get replacements very easy around $40 a set however it is a tricky job if you have not done it before, the lcd panel must be removed without damage, the backlights are stuck to the metal cover behind lcd panel.
Your backlight inverter board is likely bad. If you're handy it is relatively easy to replace. Google for replacement part.
if you can see a picture while shining a flashlight on the screen then it is most likely the inverter board. Backlights provide the light through the lcd screen for brightness.
get a torch shine on tv screen - if you can then see picture using the torch - back light is faulty - inverter that drives back light may be possible problem.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.
Fault to the main power supply regulator section. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs
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