Acer AL2223WD - Trouble Shooting; Chapter 4 TROBLE SHOOTING

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Chapter 4
TROUBLE SHOOTING
This chapter provides trouble shooting information forAL1932
Trouble Shooting
1. No Power
No Power
Check CN1
+12V and +5V
Yes
Change
Power Board
NO
Check D1=1.8V
U1 out=3.3V
Change
Q3,D1,U1,D2
NO
Check Short Of
Main Board
No
Yes
Check
X1=14.318MHz
NO
Change X1
Yes
Check U5 Pin
42,43 Clock
NO
Change U5 or
U4
RUN Software
ISP
Change U5
Yes
Check U6
Pin 42,43 Clock
Change U6
NO
Check Bottom
Board