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HP LE1901w Service Manual Page 43

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

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