Samsung CF21G Series Service Manual page 23

5 Troubleshooting
5-1-18 Micom Failure
IC201 Pin 35 input is over 4.2V?
Yes
IC201 Pin 8 and 9
16 17
inputs are right?
Yes
All in/output values are right?
Yes
Done.
5-1-19 OSD Failure
Check CN102 and connector Ass'y.
IC103 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 input is right?
Yes
Does the Voltage Change on
IC201 Pins 16, 17 When you
push the control Button?
Yes
Check IC201.
Done.
5-10
No
Check IC650.
No
Check X201, C203 and C204.
No
Replace IC201.
Check and replace
No
Q104, IC201 Pin 23.
Check 5V Line.
No
Check and replace IC103.
No
Check CN204 and Assy.
CONFIDENTIAL
WAVEFORMS
3.42 V (IC201, #8)
16
CH1 P-P = 3.42 V CH1 RMS = 2.500V
3.16 V (IC201, #9)
17
CH1 P-P = 3.16 V CH1 RMS = 2.560 V
WAVEFORMS
IC103, #6, 17
18
IC103, #5, 24
19
CF21G*