Philips 190B9CS/00 Service Manual page 48

48 HUDSON 9
11.2. Power/Inverter Board
(1) No power
Check CN902 Pin7 = 12V
NG
Check AC line volt 110V or 220V
Check the voltage of C905 (+)
Check start voltage for the pin8 of IC901
Check the auxiliary voltage is bigger than
11V and smaller than 25V
Check IC901 pin5 PWM wave
Check Q901, D903, IC903, IC904, Q903, ZD902
NG
OK
OK
NG
OK
OK
OK
Check AC input
NG
Check bridge rectified circuit and F901 circuit
Check R904, R905 and Change IC901
NG
1) Check IC901
2) Check R909, D901 circuit
NG
Check IC901