When TV power on, backlight only flash once, then gone. The main unit is good because I can see the picture with flashlight. the backlight pins is at left top corner on the first picture, third picture is detail. TV power on, The backlight pin, only VCC pin is 5V, others is 0. some pins maybe is 0.001. I think 0. There are four pins at right top corner, but only left two pins connect main unit, other two pin is empt. second picture is detail. BK_ON pin is 5V, ADJ pin is 3V when cable connect main unit. If remove cable, both pins are 0. The two pin's power come from main unit, and let backlight on. I understand: The problem is main unit give power supply signal(5V and 3V) to let power supply give power to inverter board, but power supply board is no reaction: only one pin has 5v, others is 0. Someone has idea to help me? Thanks.
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