HP LP2275w Service Manual page 47

22" LCD Color Monitor
2. W/LED No Backlight
Check ON/OFF signal
Check IC801 pin2=5V ?
Check the pin12 of IC801 have saw tooth wave
Check PIN1 PIN15 of IC801 has the output of square wave at short time.
Check Q802/Q804 Q808/Q809 PIN5, 6, 7, 8 have the output of square wave at
Check connecter & lamp
Check F801 =12V
NG
OK
OK
OK
NG
OK
OK
NG
OK
Check the output of T801,T803
NG
OK
Check C801 C802(+)
Check Interface board
NG
Change Q801 or Q802
NG
Change IC801
NG
CheckQ802/Q804 Q808/Q809
Check Q802/Q804 Q808/Q809
Check the output of T801,T803
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HP LP2275w