Osd Screen Abnormal; F.osd Screen Abnormal - Zenith D35 Service Manual

4. OSD Screen abnormal

OSD screen abnormal
YES
Does 5.3V appear at IC501
Pin42?
YES
Does pulse appear at
IC501 Pins52,53?
YES
Does pulse appear at
IC501 Pins50,51?
YES
Replace IC501.

5. F.OSD Screen abnormal

F.OSD abnormal
YES
Refer to "(4)OSD screen
abnormal".
YES
Check C.SYNC Signal at
IC501 Pin87.
YES
Replace IC501.
NO
Check Power Circuit
5.3V(Line).
NO
Check pulse input at Q501
base.
NO
Check Circuit(L506, R517,
C519, C518, R518).
NO
Refer to AVCP C.SYNC
3-9
NO
Check X301 inpulse.