When I hold a light to the TV, I can see the picture.
Its possible you have lost the voltage that powers the lamps, check that first, voltage on an LG runs about 135 volts per line, if you don't have that unhook the plug going to the lamps and see of you have about 160 volts or higher, if you do then the power supply is most likely ok and you have some shorted lamps and the supply is going into shut down. Sometimes a bad lamp will be dark colored, unfortunately its not a real easy job to get the panel open and get at the lamps, its very easy to damage the panel if extreme care isn't followed.
Lamp switch is faulty replace the y board
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://electro-medical.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...
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