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If the voltages on the PS board are good and replacing the main board did not help, then a bad panel is the next most likely cause of the TV not turning on.
A fault anywhere (including panel or backlighting) can cause the TV to fail to power on.
Has it perhaps been subject to damage from a power surge caused during a power outage or thunderstorm?
I cannot find any information on the diag codes for this set either - let me check if the other experts can assist further...