Acer AL1921 - Page 49

48
Power/Inverter Board
1.) No Power
Check to CN102 Pin1 and pin2 = 5V
Check Interface board
NG
OK
Check AC line volt 120V or 220V
NG
OK
Change F901 , check BD901,Q903,IC901
Check the voltage of C905(+)
Check bridge rectified circuit cFailure
NG
OK
Check start voltage for the pin3 of IC901
Change IC901
NG
Repeating the start voltage
Check the auxiliary voltage is smaller than 20V
1) Check IC902, IC903
2
)
Check
Q
901
,Q
902…OVP circuit
NG
OK
Check
R919,
D910,D911,D912,D913,
ZD904
OK