Samsung SyncMaster 1000s Service Manual page 38

7 Troubleshooting
7-1-18 OSD Failure
Check connection with CN101
and CN221.
Does the IC106 Pin 18 input
39
waveform match #39?
Yes
Is the IC106 Pin 5 input
48
waveform correct?
Yes
Are the IC106 Pins 7 and 8
49
input waveform correct?
Yes
Are the IC106 Pins 21, 22 and
50
23 output waveform correct?
Yes
Are the IC104 Pins 4, 9 and
51
13 input waveform correct?
Yes
Check and replace IC104.
Done
7-12
No
Check and replace around Q105.
No
Check and replace Q103, Q108 and
check around their components.
No
Check IC201 Pins 34 and 35.
No
Check +5 V, +12 V line and replace
IC106.
No
Check and replace Q109, Q110 and
Q111.
WAVEFORMS
5.24 V (IC106, #18)
39
CH1 P-P = 5.24 V CH1 RMS = 4.798 V
4.46 V (IC106, #5)
48
CH1 P-P = 4.46 V CH1 RMS = 3.934 V
5.14 V (IC106, #7, 8)
49
CH1 P-P = 5.14 V CH1 RMS = 4.858 V
50 3.66 V (IC106, #21)
CH1 P-P = 3.66 V CH1 RMS = 1.882 V
51 3.22 V (IC104, #4)
CH1 P-P = 3.22 V CH1 RMS = 1.530 V
SyncMaster 1000s (CGP1607L)