Samsung SyncMaster 755DF - Page 31

5 Troubleshooting
SyncMaster 753DF/755DF 5-11
5-1-18 OSD Failure
IC101 Pin 32 input is right?
IC101 Pin 1 input is right?
Check CN102 Pin 8.
Yes
Yes
No
Check and replace Q102.
Check CN102 Pin 14.
No
IC101 Pins 29 and 30 inputs are
right?
Check IC201 Pins 41 and 42.
Yes
No
IC101 Pins 18, 21 and 24
outputs are right?
Check and replace IC101.
Check and replace IC103.
Yes
Done
No
Check CN104 and connector Ass’y.
WAVEFORMS
19
20
21
19
1.00 V (IC101, #32)
CH1 P-P = 1.00V CH1 RMS = 4.516V
20
1.00 V (IC101, #1)
CH1 P-P = 1.00V CH1 RMS = 5.024V
21
1.00 V (IC101, #18,21,24)
CH1 P-P = 1.00V CH1 RMS = 2.580V