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7 Troubleshooting
CSH7839L/CSH9839L
7-7
7-1-12 V Size or Pos. Variation Failure
IC251 Pin 23 output varies with
different DAC values?
Yes
Check some parts around IC301.
Check bias voltage.
Check and replace IC251 and IC301.
No
7-1-13 High Voltage Failure
+220 V is on Q502 collector?
Q501 gate driving pulse exist?
Check +24 V line.
Check and replace Q501, Q253,
Q254, IC251 and Q502.
Yes
Yes
No
Check and replace R506 and Q502.
No
Q502 base driving pulse
exists?
Check and replace R504, T501,
D502, D503 and Q503.
Yes
No
Q503 drain driving pulse
exists?
Done
No
Yes
Check and replace Q504, Q507,
IC501, R515, R521, VR501, C521,
C522, T502 and T503.
WAVEFORMS
14
15
16
14
11.36 V (Q501, Gain)
CH1 P-P = 11.36 V
CH1 RMS = 6.944 V
15
808 V (T501, #1)
CH1 P-P = 808 V
CH1 RMS = 244 V
16
234 V (Q503, Drain)
CH1 P-P = 234 V
CH1 RMS = 171.5 V
Summary of Contents for SyncMaster 700p Plus
Page 2: ...Samsung Electronics Co Ltd April 1998 Printed in Korea Code No BH68 61072A ...
Page 47: ...8 Exploded View and Parts List 8 1 Front Cover CRT Ass y CSH7839L CSH7839L CSH9839L 8 1 ...
Page 48: ...8 2 Chassis Stand Ass y CSH7839L 8 Exploded View Parts List 8 2 CSH7839L CSH9839L ...
Page 49: ...8 3 Rear Cover Ass y CSH7839L 8 Exploded View Parts List CSH7839L CSH9839L 8 3 ...
Page 50: ...8 Exploded View Parts List 8 4 CSH7839L CSH9839L 8 4 Front Cover CRT Ass y CSH9839L ...
Page 51: ...8 5 Chassis Stand Ass y CSH9839L 8 Exploded View Parts List CSH7839L CSH9839L 8 5 ...
Page 52: ...8 6 Rear Cover Ass y CSH9839L 8 Exploded View Parts List 8 6 CSH7839L CSH9839L ...
Page 76: ...9 Electrical Parts List 9 24 CSH7839L CSH9839L Memo ...
Page 78: ...Memo 10 Block Diagrams 10 2 CSH7839L CSH9839L ...
Page 80: ...Memo 11 PCB Diagrams 11 2 CSH7839L CSH9839L ...
Page 82: ...13 1 CSH7839L CSH9839L 13 Schematic Diagrams 13 1 Power Part Schematic Diagram ...
Page 84: ...13 Schematic Diagrams 13 3 CSH7839L CSH9839L 13 2 Micom H V Process Part Schematic Diagram ...
Page 86: ...13 Schematic Diagrams 13 5 CSH7839L CSH9839L 13 3 Main Part Schematic Diagram ...
Page 88: ...13 Schematic Diagrams 13 7 CSH7839L CSH9839L 13 4 Video Part Schematic Diagram ...
Page 90: ...13 Schematic Diagrams 13 9 CSH7839L CSH9839L 13 5 CRT Socket Control Part Schematic Diagram ...