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When you say the LED backlight comes on are you referring to the panel backlight or the decorative lighting that some models have?
Do you hear a relay clicking?
In earlier Samsung LCDs a corrrupt EEPROM will stop the set from starting up and can cause the standby LED to stay off or on. The EEPROM could be corrupted by a power supply fault. You'd fix the power supply only to find it still wouldn't start up.
The EEPROM can be temporarily bypassed (usually by shorting the data and clk lines for a second or two while applying power) to get the set to start in service mode where the EEPROM can be reset. From memory service mode should be info -> menu -> mute -> power on the remote.
I don't know if this also applies to the model you have though.
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