Trouble Shooting
1. No Power
No Power
Check CN4
+12V and +5V
Yes
Change
Power Board
NO
Check D23=1.8V
U3 out=3.3V
Change
Q8,D23,U3,D21
NO
Check Short Of
Main Board
No
Yes
Check
X1=14.318MHz
NO
Change X1 or
U4
Yes
Check U5 Pin
6,7 Clock
NO
Change U5 or
U4
RUN Software
ISP
Change U5
Yes
Check U6
Pin 5,6 Clock
Change U6
NO
Check Bottom
Board
Chapter 4
Summary of Contents for X191W
Page 16: ...MAIN BOARD PCB CONDUCTOR VIEW ...
Page 17: ......
Page 18: ......
Page 19: ......
Page 20: ......
Page 21: ... 16 BUTTON BOARD ...
Page 22: ... 16 16 16 POWER BOARD ...
Page 23: ......
Page 24: ......
Page 31: ... 24 Bottom View Side View ...
Page 48: ......