![background image](http://html1.mh-extra.com/html/viewsonic/va720-1/va720-1_service-manual_1020964030.webp)
10.3. NO DISPLAY
Power key
work ok
Y
Check
3v3_A
N
Check
I102
H/V sync
on pin 64,66
of I103
Check
pin 4,10 of I104
N
Y
Check R110
Check R.G.B. in
DATA
Check R.G.B.
input
N
Check
key-pad
Y
N
Check
P983
N
refer to
no power
Y
Check
pin 2,3 of P105
N
Replace
I103
Y
Check
I/O cable
N
Check VCLKD0
pin 67 of I103
colok
Y
Check
R111,C121,C122
N
Check R.G.B.
DATA on I109
Check 12M
VCLK1,VCLKD0,
VCLKD1
N
Y
Check
LCD_CLK
LCD_DE
LCD_VS
LCD_HS
N
Y
Check C288 high
Check
Q107
N
Y
Check R159
Voltage Range
Check
Q108
N
Y
Invertor unit
failed
Y
ViewSonic Corporation
26
Confidential
–
Do
Not
Copy
VA720-1
VE175/b
Summary of Contents for va720-1
Page 1: ......
Page 23: ...9 2 MAIN PCB BOTTOM VIEW ViewSonic Corporation 19 Confidential Do Not Copy VA720 1 VE175 b...
Page 24: ...9 3 CON PCB TOP VIEW ViewSonic Corporation 20 Confidential Do Not Copy VA720 1 VE175 b...
Page 25: ...9 4 CON PCB BOTTOM VIEW ViewSonic Corporation 21 Confidential Do Not Copy VA720 1 VE175 b...
Page 26: ...9 5 POWER PCB TOP VIEW ViewSonic Corporation 22 Confidential Do Not Copy VA720 1 VE175 b...
Page 27: ...9 6 POWER PCB BOTTOM VIEW ViewSonic Corporation 23 Confidential Do Not Copy VA720 1 VE175 b...