21.5
″
LCD Color Monitor BenQ E2220HD
73
Power Board
(1). No power
Check CN902 PIN4, 5 = 5V
Check AC line volt 110V or 220V
Check AC input
Check the voltage of C905 (+)
Check bridge rectified circuit and F901 circuit
Check start voltage for the pin8 of U901
Check R904, R905, Change U901
NG
Check the auxiliary voltage is bigger than
10V and smaller than 20V
1) Check U901
2) Check R909/D901/C907 circuit
OK
OK
NG
Check U903/U904/D903/ZD921/ZD922/ZD902
OK
Check U901 pin5 PWM wave
OK
Check U901
NG
NG
NG
OK
NG
Содержание E2220HD
Страница 47: ...21 5 LCD Color Monitor BenQ E2220HD 47 Six angles view...
Страница 76: ...21 5 LCD Color Monitor BenQ E2220HD 76 PCB LAYOUT Main Board...
Страница 77: ...21 5 LCD Color Monitor BenQ E2220HD 77...
Страница 78: ...21 5 LCD Color Monitor BenQ E2220HD 78 Power Board...
Страница 79: ...21 5 LCD Color Monitor BenQ E2220HD 79...
Страница 80: ...21 5 LCD Color Monitor BenQ E2220HD 80...
Страница 81: ...21 5 LCD Color Monitor BenQ E2220HD 81 USB Board...
Страница 82: ...21 5 LCD Color Monitor BenQ E2220HD 82 Key Board...