ViewSonic VLCDS23722-1W Service Manual page 16

No screen
handle
(2)
YES
CHK U5 CKT
VCC/U5
OK
CHK CKT
Sheet 5
(Panel)
No screen
handler
(2)
ViewSonic Corporation
LED always
ON or always
OFF when
power on ok ?
NO
CHK
system power
CHK U15
Pin 5,6
CHK U15
(if recall
function
is OK)
START
NO
CHK CKT
NO
Sheet 4
(Power)
NO
CHK J1
NO
NG
CHK U6
CHK U15
13
Confidential – Do Not Copy
Back-light
?
ok
YES
5V or 3.3V
ok ?
YES
U14 pin
10,21,22,23
ok ?
YES
CHK
LP2 ~ LP13
ok ?
YES
CHK CN3
CHK Panel
VE500-1