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2.) No Backlight
Check if the input voltage of inverter part is 16V
NG
OK
Check adapter part
Check ON/OFF signal
Check Interface board
NG
OK
Check IC801 PIN12=14.5V
NG
OK
Check ON/OFF circuit
Check IC801 PIN5 have triangle wave
NG
OK
Change IC801
Check IC801 PIN9/PIN10 PWM wave
NG
OK
Check R816/R817/R818/R819
Check the output of PT801
Check connecter & lamp
OK
NG
Change PT801