Lenovo L194 Wide Service Manual page 33

19" LCD Color Monitor
W / LED, No Backlight
Check CN902 pin4, 5 = 12V
Check ON/OFF signal and the pin 12 of IC801 is 12V
Check the pin5 of IC801 have saw tooth wave
Check the PWM wave from the pin9,10 of IC801
Check Q802, Q803 PIN5, 6, 7, 8 have the
output of square wave at short time.
OK
Check the output of T801, T802
OK
Check connecter & lamp
NG
OK
NG
OK
NG
OK
OK
Check the adapter and F801
Check main board or change ON/OFF signal
Change IC801
Check IC801
NG
NG
33
Lenovo L194 Wide
Check Q801, Q804, Q811, Q812,
Q802, Q803
Change T801, T802