Samsung CKF5607L

7 Troubleshooting
CKF5607L 7-5
Replace the IC105.
Check DC 8.2 V line D101, D102,
IC101, IC603 and Q102.
Power indicator is green
Check signal cable
and signal source
Does DC 8.2 V appear at
Pins 9 and of IC101?
Does the video pulses
appear at Pins 2, 4 and 6
of IC101 on the Video Board?
Check contrast circuit
on the main Board
(Q102 and Q513).
Check DC 70 V at Pin 6 of IC105.
Check IC202 (pin
#16) on the main
Board.
Does the video pulse
appear at Pins 15, 19 and
22 of IC101?
Does the clamp signal
appear at Pin 16 of IC202?
7-6 No Video
Yes
No
Yes
No
Yes Yes
No
No
No
Does the video amplified
pulse appear at
Pins 8, 9 and 11 of IC105?
Yes Yes
Does the H-BLK
appear at Pin 24 of IC101?
No
29
28
33
WAVEFORMS
5.36 V (IC202, #16)
CH1 P-P = 5.36 V CH1 RMS = 1.036 V
28
800 mV (IC101, #2, 4, 6)
CH1 P-P = 800 mV CH1 RMS = 3.162 V
29
3.34 V (IC105, #8, 9, 11)
CH1 P-P = 3.34 V CH1 RMS = 3.088 V
33