Acer AT2231 Wartungshandbuch PDF herunterladen (Seite 30)

30

No Power (No LED indicator)

Check bridge rectified circuit and F901 circuit

Check R904, R905 and Change IC901

1) Check IC901, D902, C908

2) Check IC902 OVP circuit

Check CN902 pin10,11 = 12V

Check AC line volt 110V or 220V

Check AC input

Check the voltage of C905 (+)

Check start voltage for the pin8 of IC901

NG

Check the auxiliary voltage is bigger than

10V and smaller than 20V

OK

NG

Check T901, Q903, D906, D904, ZD920, IC903

Check IC901 pin5 PWM wave

OK

Check IC901

NG

NG

OK

NG

OK

OK

NG

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