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7 Troubleshooting
7-7 No OSD Displays
There is video but no OSD.
While pushing a front
control button does any pulse
appear at Pins 10 and 11 of
IC201?
Yes
Does the horizontal
flyback pulse appear
36
at Pin 5 of IC104?
Yes
Does the vertical
blanking pulse appear at
37
Pin 18 of IC104?
Yes
Does the any pulse appear at
Pins 20, 21 and 22 of IC104? (After
pushing a front control button)
Yes
Does the Voltage (about 2.9V)
appear at Pin 14 of IC101?
Yes
Replace IC102.
7-6
Check the push buttons on the front
No
control board SW1 ~ SW5,
CF201 and IC201.
Check horizontal flyback pulse
No
generation circuit.
(T402 Pin 10, Q102)
Check vertical blanking pulse
No
generation circuit.
(R125 and IC105)
No
Check IC104.
No
Check R102 and R103.
WAVEFORMS
36
5.44 V (IC104, #5)
CH1 P-P = 5.44 V
CH1 RMS = 4.408 V
37
5.40 V (IC104, #18)
CH1 P-P = 5.40 V
CH1 RMS = 324 mV
CKG7507L
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