Samsung CL21A8W7X/DRI Service Manual page 16

Troubleshooting
5-4 Horizontal Lines Appear on screen
Normal
Check/Replace
IC301
5-4
Normal
Check
the VDP Signal
output from IC201
Pin 31
Abnormal
Check
IC201
Horizontal Lines
Apper on screen
Check
IC301 B+
(16V, -16V)
Abnormal
Check
B+ Line and the fusible
resistance of R425, 424
Samsung Electronics