Samsung SyncMaster 1000s Service Manual page 35

7-1-15 Dynamic Focus Failure
Does the T502 Pin 13 input
24
waveform match #24?
No
Is the T504 Pin 1 waveform
47
correct?
No
Does the Q510 Emitter
23
waveform match #23?
Yes
Does the IC403 Pin 15
15
waveform match #15?
Yes
Does the Q507 collector
31
waveform match #31?
Yes
Does the T502 Pin 13
waveform level vary with
24
different DAC vlaues?
Yes
Done
SyncMaster 1000s (CGP1607L)
Yes
Check the connection between T502
with CRT Socket.
Yes
Check C543.
No
Check Q508, Q509, Q510 and around
related components.
No
Check and replace IC403 and IC201.
No
Check Q507, Q513, Q514 and IC503.
No
Check IC201 Pin 8.
7 Troubleshooting
WAVEFORMS
3.72 V (IC403, #15)
15
CH1 P-P = 3.72 V CH1 RMS = 3.6 V
58.4 V (Q510, Emitter)
23
CH1 P-P = 58.4 V CH1 RMS = 38.7 V
616 V (T502, FOCUS #13)
24
CH1 P-P = 616 V CH1 RMS = 308 V
160 V (Q507, Collector)
31
CH1 P-P = 160 V CH1 RMS = 159 V
47 606 V (T504, #1)
CH1 P-P = 606 V CH1 RMS = 279.4 V
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