Chapter 4 Troble Shooting; Trouble Shooting - Acer AL2223WD Service Manual

TROUBLE SHOOTING

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