Samsung PLK405WX/XAC Service Manual page 45

Troubleshooting
6-14 Horizontal Sync Pattern Appears On Screen
6-10
Pattern Looks Like This :
Yes
Check M-Y-O,
signal output
from the AV S/W Board
Yes
Check 2H-SYNC,HV-BLK
output from the Proscan
Board
Yes
Check 2H-SYNC,
supply to LCD Control Board
Yes
Check
2H-SYNC input to ICL301
pin11 on LCD Control
Board
Yes
Check the
voltage of CNL06 FPD, RPD
(2.5V)
Yes
Check the terminal
(connected to LCD panel)
No
Check the AV
Switch Board
No
Check the
Proscan Board
No
Check ASS'Y
AC1 (connector)
No
Check ICL104
and FL302
Adjust FPD, RPD so
No
that FPD, RPD
becomes 2.5V
Samsung Electronics