19" LCD Color Monitor HP LE1901w
43
2. W/LED No Backlight
Check C804(+) =12V
NG
OK
Check Q805
Check ON/OFF signal
Check Interface board
NG
OK
Check IC801 pin6/10=12V ?
NG
OK
Change Q802
Check the pin1 of IC801 have saw tooth wave
NG
OK
Change IC801
Check PT801 has the output of square wave at short time.
NG
OK
Check PT801
Check the resonant wave of pin8 & pin9 for PT801
NG
Check the output of PT801
Check R820
Check connecter & lamp
OK
NG
Change PT801
OK
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