HP L1950 Service Manual page 41

19" LCD Color Monitor
2. W/LED No Backlight
Check C812 (+) =12V
Check ON/OFF signal
Check IC801 pin2=5V ?
Check the pin1 of IC801 have saw tooth wave
Check ZD803 has the output of square wave at short time.
Check the resonant wave of pin2 & pin5 for T801
Check the output of T801
Check connecter & lamp
NG
OK
NG
OK
OK
NG
OK
NG
O
NG
OK
NG
OK
Check Q806
Check Interface board
NG
Change Q802 or Q803
Change IC801
CheckQ805/Q806
Check Q801/Q811/D806/D807/D808
Change T801
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HP L1950