Samsung CHB5707L/5237L Service Manual page 37

7-1-18 OSD Failure
Check CN104 and connector Ass'y.
IC104 Pin 10 input is right?
19
Yes
IC104 Pin 5 input is right?
20
Yes
IC104 Pins 7 and 8 inputs are
right?
Yes
IC104 Pins 13, 14 and 15
outputs are right?
No
IC101 Pins 21, 24 and 26
outputs are right?
Yes
Check and replace IC102.
Done
CHB5**7L/6**7L/7**7L
No
Check and replace Q103.
Check CN104 Pin 15.
No
Check and replace Q102.
Check CN104 Pin 13.
No
Check IC201 Pins 12 and 16.
No
Check and replace IC104.
No
Check and replace IC101.
7 Troubleshooting
WAVEFORMS
19 4.92 V (IC104, #10)
CH1 P-P = 4.92 V CH1 RMS = 5.072 V
20 4.84 V (IC104, #5)
CH1 P-P = 4.84 V CH1 RMS = 4.222 V
7-11