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Test LED output voltage, if its missing look at the power board as being bad, also test the PWM voltage and make sure its between 2 and 4 volts, if its not correct the main board may be bad.
Your issue is in the LED lamps or power supply, test the voltage at the connector that comes out of the power board and see if you have voltage there of 100 plus volts DC, if you don't unhook the connector and see if you have around 150, if you do then you have at least one lamp that is bad and needs replacing, if there isn't any voltage there its the power 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. To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board . 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. http://electro-medical.blogspot.com/
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