Samsung CKF5607L

7 Troubleshooting
7-6 CKF5607L
OSD Gain (IC101 Pin 11) Check IC102.
When you push a button
on the front control panel
does the voltage vary at Pins
18 and 19 of IC202?
Check horizontal flyback pulse
generation circuit.
(T402 Pin 10, and Q414)
While pushing a front
control button does any pulse
appear at Pins 18 and 19 of
IC202?
Does the horizontal
flyback pulse appear
at Pins 8, 9 and 11 of IC105?
Check vertical blanking pulse
generation circuit.
(Q501 and Q201)
Check the push buttons
control board SW1 ~ SW6
and main board CF202.
Check the pins of IC600
and the related circuit.
Does the vertical
blanking pulse appear at
Pin 5 of IC102?
7-7 No OSD Displays
Yes
Yes
No No
Yes
No
Yes
No
Does the OSD video
signal appear at Pins
7 and 8 of IC102?
Yes
Does DC 5 V appear at
Pin 4 of IC102?
Yes
No No
Does the OSD output
signal appear at Pins
21, 22 and 23 of IC102?
Yes
No
There is video but no OSD.
Check IC202.
Check IC102.
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WAVEFORMS
3.34 V (IC105, #8, 9, 11)
CH1 P-P = 3.34 V CH1 RMS = 3.088 V
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4.52 V (IC102, #5)
CH1 P-P = 4.52 V CH1 RMS = 3.920 V
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