ViewSonic VP720B - ThinEdge - 17" LCD Monitor Service Manual page 48

6.3. NO DISPLAY
Power key
work ok
Y
Check
H V sync
Y
Check R.G.B
DATA
Y
Check
X101
Y
Check I108
HS,VS
HWRESET
Y
Check
BACKLITE
6.4. LOSE COLOR
Some bits
lost
Y
Check I108
Pin
I103 poor
soldering
P105 poor
soldering
ViewSonic Corporation
Check
N N
Keypad
N N
Check I108
Check
N N
I/O cable
Check
N N
C159,C160
Check
N N
SCL,SDA
N Check N
Q102
I108 or
N
R-pack
soldering
N
I106 poor
soldering
N Check
Check
5V MCU
Check
N
I/O cable
P102
N
Check
I101
N
Check
VCC2.5V,
I101,I102,I105
3.3V,1.8V
Check
N
SCL,SDA
I106
N
Check
Check
P105 WIRE PANEL
Lose color
R or G or B
Y
Check P102 N
Pin 8,10,12
Y
Check
N
L108,109,110
R106,107,108
Y
I108
fail or poor
soldering
Confidential – Do Not Copy
45
I106
Check
Check
P102
Check
Check
I103
Check
Sign Cable
Check
C104,105,107
C108,109,110
VP720-1_VP720b-1