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OK, what volts appear at pin-20 (PS-ON) of connector CNM801 of power board that goes to main board?
OK, please unplug connector of CNM801 and again check volts at pin-20.
OK, to check the power supply board output volts please jump the pin-20 to GND pin (14 or 16) to turn On the power supply without connecting the main board. You should get B13V at pin-7,10 and B5V at pin-17, 19 etc.
If these volts are available then power board is working. Regarding turning On backlight section, it is bit complicated as it needs command and pulse width modulation signal (PWM) from main board to turn it On.
Please reply back with the result.
I would recommend to solder a piece of wire to jump the pin-20 to pin-14 or 16 then replug TV power cord in and check output volts of power supply board.
Hi, no problem, please take you time.
OK, that means power supply board is working, jumping the PS-ON pin to ground turns Off the power supply which indicates all is set at power supply board and issue would be with main board in TV, replacement of main board will help to resolve the issue.
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