NO
YES
YES
YES
CHK CKT
Sheet 4
(Power)
START
No screen
handle
(2)
Back-light
ok
?
5V or 3.3V
ok ?
NO
YES
NO
U14 pin
10,21,22,23
ok ?
CHK J1
NO
CHK
LP2 ~ LP13
ok ?
CHK U6
CHK U15
CHK CN3
CHK Panel
CHK U5 CKT
VCC/U5
YES
CHK
system power
NO
CHK U15
Pin 5,6
CHK U15
(if recall
function
is OK)
CHK CKT
Sheet 5
(Panel)
No screen
handler
(2)
NG
OK
LED always
ON or always
OFF when
power on ok ?
ViewSonic Corporation
13
Confidential
– Do Not Copy
V
E
500
-1