Acer AL1923 - Page 35

Trouble Shooting
1. No Power
No Power
Check CN7
+12V and +5
V
NO
Change
Power Board
No
Yes
Check Short Of
Main Board
Check U13=1.8V
U12=3.3V
NO
Change
U13,U12
Yes
NO
Change X1 or
U4
Check
X1=14.318MHz
Yes
NO
Change U7 or
U4
Check U7 Pin
1,2,5,6 Clock
Change U7
Yes
RUN Software
ISP
Check Key
Board
Yes
NO
Change Key
Board