Iiyama PLE1902S Service Manual page 36

19" LCD Color Monitor
8.2.2 Power Board
1) No power
Check L904 = 12V
Check AC line volt 110V or 220V
Check the voltage of C905 (+)
Check start voltage for the pin3 of IC901
Check the auxiliary voltage is bigger than
10V and smaller than 20V
Check IC901 pin8 PWM wave
Check Q901/D903/IC903/ZD921/ZD922
NG
OK NG
OK NG
NG
OK
NG
OK
OK NG
Check AC input
Check bridge rectified circuit and F901 circuit
Check R904, R932, R933, Change IC901
1) Check IC901
2) Check R909/D901 circuit
Check IC901
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Iiyama PLE1902S