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The led driver may be on the main board or on it's own board. Led strips don't fail all at once so if you had a dark area of the picture then I'd suspect a led strip. TV Parts Universal TV Stands DLP Chips ShopJimmy This is the place to get parts.
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
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