Samsung PLK405WX/XAC Service Manual page 46

6-15 Vertical Sync Bars Appear on Screen
Samsung Electronics
Yes
Check M-Y-O, S-Y-O
signal output from the AV
S/W Board
Yes
Check V-SYNC,HV-BLK
output from the Proscan
Board
Yes
Check V-SYNC
supply to LCD Control Board
Yes
Check V-SYNC input to
ICL301 pin14 on LCD
Contrrol
Yes
Check the terminal
(connected to LCD panel)
No
Check the AV Switch
Board and comb filter
No
Check the
Proscan Board
No
Check ASS Y
AC1 (connector)
No
Check ICL104
and FL302
Troubleshooting
6-11