Samsung CS-21 Troubleshooting

Troubleshooting

Samsung Electronics 5-1

5. Troubleshooting

5-1 No Power

Disconnect
the Power Cord

Check
Power LED

LED OFF

Check

IC901 B+

Abnormal

Check

the voltage of

IC804

Abnormal

Check

the resistance of

FD803

LED ON

Normal

Check
IC803

Normal

Check
IC803

Abnormal

Check IC901
Pin

5

6

Abnormal

Check
Q909, Q910

Abnormal

Replace

Q909,Q910

Abnormal

Replace

IC902

Normal Normal

Normal

Check
IC902

Check

SCL, SDA Line

Check IC901
Pin

Check IC908 and

Replace IC901

Normal

50

Abnormal

Abnormal

Replace

Abnormal

Check Q401 and

Horizontal Circuit

IC201

Check/Replace

IC803, 805

Abnormal

Check

the voltage of

IC803, 805

Normal

Check

H-OUT of IC201

Pin

50

Normal

Check the
voltage of

IC803, 805

Normal

Check FBT and

B+(130V)

Normal

Check

IC801, D801 FUSE

Replace FD803

5-2 No Raster (Sound OK)

Troubleshooting

5-2 Samsung Electronics

Check

Fusible Resistance

Abnormal

Check

voltage of

heater

Normal

Check

CRT and FBT

Check / Replace

IC201

Normal

Normal

No Raster

(Sound OK)

Check

RK,GK,BK Signal

output from

CRT PCB

Abnormal

Check

the signal output

from IC201 Pin

63

Abnormal

Check tuner B+
and Main CVBS

Abnormal

Check

R.G.B Signal

input to CRT PCB

Abnormal

Check

R.G.B Signal

Output from

IC201

Normal

Check
Q202, Q203, Q204,
Q207, Q209, Q213,

Q206, Q208, Q210

Normal

Check

the fusible resistance

of abnormal volatge line

Abnormal

Check

B+

(200V, 16V)

Normal

Check

Q501 and re-adjust

Screen Voltage