Samsung CS21K3DX/BWT Service Manual page 24

Troubleshooting
5-2 No Video (Sound OK)
Check RK,GK,BK
Signal
Nornal
Check the
Voltage of heater
Nornal
Check
CRT and FBT
Check/Replace
IC201S
5-2
Abnormal
Check R,G,B
Signal into CRT
PCB
Abnormal
Abnormal
Check/Replace
R418,R513,D503
Abnormal
Check IC201S
Pin 51,52,53
(R.G.B)
Nornal
Check IC201S
Pin 49(V-GUARD)
Pin50(IK)
Abnormal
Check
CRT and FBT
Nornal
Abnormal
resistance of R512
Nornal
Check/Replace
Nornal
Nornal
Check IC501
B+(180V-B)
Screen Voltage
Abnormal
Check the
D407,FBT
Re-Adjust
Replace
R512
Samsung Electronics