Service manual

CHK PWR
REF: power
flow
No display
(2)
Back-light
ok ?
NO
YES
U7
SCALER
INPUT/OUTPUT
D-SUB
VGA 15PIN
NO
CHK
JP9 INPUT
YES
CABLE
CHK Panel
CONNECTOR
YES
LED always ON
or always OFF
when power on
ok ?
CHK U5
SOCKET、
SOFTWARE、
KEY PAD
YES
CHK
JP1 PIN3、4
NO
CHK U5
Pin 19
CHK
SOFTWARE
OR
CHANGE U7
CHK
U1、U2
NG
OK
YES
CHK LCD-VCC
CHK CLK
CHK R、G、B SIGNAL
NG
CHANGE
Power board
FLASH
NORMAL
RETURN
OK
REPLACE
U1、U2
NG
36
ViewSonic Corporation Confidential
-
Do Not Copy Q9-1_Q9b-1