ViewSonic VP720B Service Manual - Page 47
No Power, 2. Mcu No Function
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UPC - 766907169218
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6.1. NO POWER POWER STAR CHECK 5V O/P T801 12V CHECK 12V O/P C823 CHECK I902 CHECK F801 D801 C805 CHECK 5V D823 D822 CHECK 12V I801 Q801 CHECK P901~P904 CHECK I901 Q905, Q911 Q907, Q908 Q909, Q910 Y CHECK T901, T902 MAIN BOARD 6.2. MCU NO FUNCTION CHECK N RESET CHECK VCC5V N OK? CHECK I106 N PIN41 3.3V? CHECK C234.R208,D121 D116,R186 CHECK L804,D823,D822 OK ? CHECK Q103,Q104,D101, D102,L107 CHECK N 24MHZ PIN15,16 OK? CHECK X102,C232 C233 OK ? CHECK PIN15,PIN16 CLOCK OK ? N CHECK TRACE OK ? CHECK N I106 EVERY TWO PIN SHORT ? CHECK KEYPAD P107 OK ? PANEL ViewSonic Corporation Confidential - Do Not Copy 44 VP720-1_VP720b-1
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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