Samsung CKG7507L

7 Troubleshooting
7-6 CKG7507L
Replace IC102.
Check horizontal flyback pulse
generation circuit.
(T402 Pin 10, Q102)
While pushing a front
control button does any pulse
appear at Pins 10 and 11 of
IC201?
Does the horizontal
flyback pulse appear
at Pin 5 of IC104?
Check vertical blanking pulse
generation circuit.
(R125 and IC105)
Check the push buttons on the front
control board SW1 ~ SW5,
CF201 and IC201.
Check IC104.
Check R102 and R103.
Does the vertical
blanking pulse appear at
Pin 18 of IC104?
7-7 No OSD Displays
Yes
No
Yes
No
Yes
No
Does the any pulse appear at
Pins 20, 21 and 22 of IC104? (After
pushing a front control button)
Yes
No
No
Does the Voltage (about 2.9V)
appear at Pin 14 of IC101?
Yes
There is video but no OSD.
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WAVEFORMS
5.40 V (IC104, #18)
CH1 P-P = 5.40 V CH1 RMS = 324 mV
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5.44 V (IC104, #5)
CH1 P-P = 5.44 V CH1 RMS = 4.408 V
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