19” LCD Color Monitor Adelpia TGL198AW
36
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 or main board
NG
OK
Check U801 PIN12=16V
NG
OK
Check ON/OFF circuit
Check U801 PIN5 have triangle wave
NG
OK
Change U801
Check IC801 PIN9/PIN10 PWM wave
NG
OK
Check U801
Check Q804, Q809 Drain wave
NG
Check the output of T801, T802
Check Q805/ Q806/ Q810/Q811
Check connecter & lamp, feedback and protect circuit
OK
NG
Change T801, T802
OK
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