Philips 190V9FB/97(1) Service Manual page 44

44 HUDSON 9
11.2. Power/Inverter Board
(1) No power
Check ZD902 (-) = 16V
Check AC line volt 110V or 220V
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, IC904, ZD921, ZD922
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NG
NG
OK
Check the voltage of C905 (+)
OK
OK
OK
OK
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Check AC input
NG
Check bridge rectified circuit and F901 circuit
NG
Check R904, R905, R906 and Change IC901
NG
1) Check IC901
2) Check R909, D901 circuit
NG
Check IC901