Samsung CF21M Service Manual page 60

5-1-19 OSD Failure
Check CN102 and connector Ass'y.
IC103 (19": IC03) Pin 6 and 17
waveforms are right?
18 19
Is there 5V on IC103 Pin 5 and 24?
Yes
IC102 Pins 1, 2 and 3, 4 (19": IC101
Pins 1, 4 and 9, 13) input is right?
Yes
Does the Voltage Change on
IC201 Pins 11, 12 When you
push the control Button?
Yes
Check IC201.
Done.
CF21M*
Check and replace
No
Q104, IC201 Pin 20.
Check 5V Line.
No
Check and replace IC103 (19":IC103).
No
Check CN204 and Assy.
5 Troubleshooting
WAVEFORMS
IC103, #6, 17
18
IC103, #5, 24
19
5-11