Question about LG Televison & Video
LG 55UF6450. Just over one year old (out of warranty) I can tell the backlights are lit up, just no video signal at all showing on the screen (menus or anything).
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. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.
Posted on Dec 07, 2016
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Posted on Jan 02, 2017
contact either LG or your seller This is a manufacturer warranty callback It is a well known problem and will be fixed free of charge
Posted on Aug 12, 2009
To answer your question;
Strange coincidence but i repaired the same tv model that you have yesterday and for the exact same problem so here`s the fix;
In your power supply on the 5volts line there is two 3300mfds/10volts capacitors gone bad and that caused the voltage to drop to 4 volts(not enough to shutdown the set but enough to kill the video)
You`ll recognize these capacitors by a rounded top and some fluid that leaked out, you can replace them with 3300mfds/16volts since the 10 volts variety is harder to find.
And while your at it you should inspect and replace the other capacitors in that area that have the same look
Good luck and keep me posted
Posted on Jan 21, 2010
SOURCE: vizio p50hdtv10a. Tv has sound
sounds like you needed to replace your video fuse before anything normally if you have video but no sound its an audio fuse and vica versa if for some reason both were out I would say your in need of a new power supply I would suggest replacing the fuse and if it still does not work contacting a service tech to run a diagnostic to see what exact part or maintenance you need
Posted on Nov 07, 2010
had a very similar situation with my Phillips 42 in. LCD TV.
Here was my Problem. The Power Supply Board. I opened it up( Warranty was Expired) and found several faulty capacitors on the PSB. Its pretty common. Major Electronic companies were sold faulty capacitors that fail in 2-5 years instead of 10-20 due to a lack of preservatives. It wouldn't surprise me if you have the same problem. TV will work fine for a few years and then just fail completely or slowly deteriorate.
Here are the solutions
1. Have it Repaired
2. Check for faulty caps and if you find some(budged or leaking) you know you have located a problem
Remove the board and replace the whole thing.
3. If you have some soldering skills you can replace the faulty caps.
Caps are very inexpensive, under a dollar in most cases. I replaced 4 for about $5.00
Hope this Helps.
Posted on Dec 10, 2010
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