6.1. NO POWER
6.2. MCU NO FUNCTION
12V
POWER
STAR
CHECK
5V O/P
T801
CHECK
I902
CHECK
P901~P904
PANEL
CHECK
12V O/P
C823
CHECK F801
D801 C805
CHECK
I801
Q801
CHECK
D823
D822
CHECK I901
Q905, Q911
Q907, Q908
Q909, Q910
CHECK
T901, T902
Y
MAIN
BOARD
5V
12V
CHECK
RESET
CHECK VCC5V
OK?
CHECK I106
PIN41 3.3V?
CHECK
24MHZ PIN15,16
OK?
CHECK
PIN15,PIN16
CLOCK OK ?
CHECK
I106 EVERY TWO
PIN SHORT ?
CHECK
C234.R208,D121
D116,R186
CHECK
L804,D823,D822
OK ?
CHECK
Q103,Q104,D101,
D102,L107
CHECK
X102,C232
C233 OK ?
CHECK TRACE
OK ?
CHECK
KEYPAD
P107 OK ?
N
N
N
N
N
N
ViewSonic Corporation Confidential – Do Not Copy VP720-1_VP720b-1
44
Summary of Contents for VP720-1
Page 75: ...ViewSonic Corporation Confidential Do Not Copy VP720 1_VP720b 1 72 ...
Page 88: ...11 2 MAIN PCB BOTTOM VIEW ViewSonic Corporation Confidential Do Not Copy VP720 1_VP720b 1 85 ...
Page 90: ...11 5 POWER PCB TOP VIEW ViewSonic Corporation Confidential Do Not Copy VP720 1_VP720b 1 87 ...
Page 91: ...11 6 POWER PCB BOTTOM VIEW ViewSonic Corporation Confidential Do Not Copy VP720 1_VP720b 1 88 ...