5 Troubleshooting
AN17K*/AN17L*
5-7
5-1-13 High Voltage Failure
IC401 Pin 28 OSC pulse exists?
Q402 Gate driving pulse exists?
Check and replace Q401 and Q420.
Yes
Yes
No
Check and replace IC401
and +12 V line.
No
Q402 Drain pulse exists?
Check and replace
Q402, L402 and D401.
Check 50V Line.
Yes
No
Done
10
3
IC101 Pin 8 input exists and
varies with different patterns?
Check and replace IC101.
Input full white pattern to monitor.
Yes
No
T501 Pin 8 output exists?
Check and replace T501.
Yes
No
IC201 Pin 26 output exists and
varies with different patterns?
Check and replace IC201.
Yes
No
Done
Check CN102.
5-1-14 ABL Failure
11
3
2.00 V (IC401, #28)
CH1 P-P = 2.00 V CH1 RMS = 5.868 V
10
2.00 V (Q402, Gate)
CH1 P-P = 2.00 V CH1 RMS = 7.692V
11
50.0 V (Q402, Drain)
CH1 P-P = 50.0 V CH1 RMS = 73.7V
WAVEFORMS
CONFIDENTIAL
Summary of Contents for SyncMaster 753 DFX
Page 7: ...2 Product Specifications 2 4 AN17K AN17L Memo CONFIDENTIAL...
Page 34: ...AN17K AN17L 6 1 6 Exploded View and Parts List 6 1 1 AN17KS CONFIDENTIAL...
Page 35: ...6 Exploded View Parts List 6 2 AN17K AN17L CONFIDENTIAL 6 1 2 AN17KS Front 1 2 3 4 5 9 6 8 7...
Page 36: ...6 Exploded View Parts List AN17K AN17L 6 3 CONFIDENTIAL 6 2 1 AN17KT...
Page 37: ...6 Exploded View Parts List 6 4 AN17K AN17L CONFIDENTIAL 6 2 2 AN17KT Front 2 3 1 4 5 6 8 10 9...
Page 38: ...6 Exploded View Parts List AN17K AN17L 6 5 CONFIDENTIAL 6 3 1 AN17LS...
Page 39: ...6 Exploded View Parts List 6 6 AN17K AN17L CONFIDENTIAL 6 3 2 AN17LS Front 2 3 1 4 5 7 8 10 9...
Page 40: ...6 Exploded View Parts List AN17K AN17L 6 7 CONFIDENTIAL 6 4 1 AN17LT...
Page 41: ...6 Exploded View Parts List 6 8 AN17K AN17L CONFIDENTIAL 6 4 2 AN17LT Front 2 3 1 4 6 5 8 10 9...
Page 75: ...Memo 8 Block Diagrams 8 2 AN17K AN17L CONFIDENTIAL...
Page 77: ...9 PCB Diagrams 9 2 AN17K AN17L Memo CONFIDENTIAL...
