Samsung SyncMaster 1000s Service Manual page 29

7-1-3 H_Deflection Failure
Is the IC401 Pin 6
26
waveform correct?
Yes
Is the Q405 source
27
waveform correct?
Yes
Do the Q406 gate and
drain waveforms
18 28
match #18, #28?
Yes
Do the Q407 base and
collector waveforms
29
match #29?
Yes
IC403 Pin 4 waveform is right?
43
Yes
Check some parts around Q413.
Does the IC403 Pin 26
44
waveform match #44?
Yes
Check some parts around
Q415 and Q416.
SyncMaster 1000s (CGP1607L)
No
Check R401 (+12 V line), IC401 Pins
5, 6 and 7 and replace IC401.
No
Check Q405, R419, R423, D405 and
+195 V line.
No
Check Q406, D409 and +80 V line.
No
Check and replace Q407, D413 and
DY connector connection.
No
Replace IC403.
No
Check some parts around IC403.
18
CH1 P-P = 14.16 V CH1 RMS = 8.1 V
26
CH1 P-P = 13.28 V CH1 RMS = 7.5 V
27
CH1 P-P = 216 V
28
CH1 P-P = 51.6 V
29
CH1 P-P = 1.160 kV CH1 RMS = 300 V
44 12.40 V (IC403, #26) 43
CH1 P-P = 12.40 V CH1 RMS = 8.188 V CH1 P-P = 3.48 V
7 Troubleshooting
WAVEFORMS
14.16 V (H_DRIVE)
13.28 V (IC401, #6)
216 V (T402, #6)
CH1 RMS = 151 V
51.6 V (Q406, Drain)
CH1 RMS = 22.6 V
1.160 kV (Q407, Collector)
3.48 V (IC403, #4)
CH1 RMS = 2.898 V
7-3