Dell SP2009W Service Manual - Page 53
Power/Inverter Board
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20" LCD Color Monitor 9.2.2 Power/Inverter Board No power Check CN902 pin8,9= 5V NG Check AC line volt 110V or 220V Dell SP2009Wc OK NG Check AC input Check the voltage of C903(+) NG OK Check bridge rectified circuit and F901 circut Check start voltage for the pin3 of IC901 NG OK Check R904,R932,R933 and Change IC901 Check the auxiliary voltage is bigger than 10V and smaller than 20V NG OK 1) Check IC901 2) Check IC901 over current protect circuit Check IC901 pin8 PWM wave NG OK Check IC901,Q901,D901 Check Q900, T901, D920, D921, Q922,Q921,IC902,IC921, L922,L921, ZD922, ZD921 53
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20" LCD Color Monitor
Dell SP2009Wc
53
9.2.2 Power/Inverter Board
No power
Check bridge rectified circuit and F901 circut
1) Check
IC901
2) Check IC901 over current protect circuit
Check CN902 pin8,9= 5V
Check the voltage of C903(+)
Check start voltage for the pin3 of IC901
Check R904,R932,R933 and Change IC901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
NG
NG
NG
Check Q900, T901, D920, D921,
Q922,Q921,IC902,IC921, L922,L921, ZD922, ZD921
Check IC901 pin8 PWM wave
Check IC901,Q901,D901
NG
OK
NG
OK
OK
OK
OK
Check AC line volt 110V or 220V
Check AC input