SAMSUNG CS-21K5SQ(KS1B(P)) Service Manual Troubleshooting
Samsung Electronics
Troubleshooting
5-1
5. Troubleshooting
5-1 No Power
Counect
the Power code
Power LED
LED Off
Check the
12.5V-A Line
Abnormal
Check the
FD802S, IC801S
or AC-Fuse
Check
the
LED On
Normal
Check/Replace
IC802
Abnormal
Check the
3.3V-A,8V-A Line
of IC201S
Normal
Check the
X-tal,SDA,SCL port
of IC201S
Normal
Check the
(33)Pin (H-Drive)
of IC201S
Normal
Check the
130V- A Line
Normal
Check / Replace
Q401
Abnormal
Replace
IC201 S
Abnormal
Abnormal
Check the
FBT,D808
5-2 Samsung Electronics
5-2 No Video (Sound OK)
Troubleshooting
Check RK,GK,BK
Signal
Nornal
Check the
Voltage of heater
Nornal
Check
CRT and FBT
Abnormal
Abnormal
Check/Replace
R418,R513,D503
Abnormal
Check/Replace
IC201S
Check R,G,B
Signal into CRT
PCB
Abnormal
Check IC201S
Pin 51,52,53
(R.G.B)
Nornal
Nornal
Check IC501
B+(180V-B)
Abnormal
Check the
resistance of R512
Nornal
Check/Replace
D407,FBT
Nornal
Re-Adjust
Screen Voltage
Abnormal
Replace
R512
Abnormal
Check IC201S
Pin 49(V-GUARD)
Pin50(IK)
Nornal
Check
CRT and FBT
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