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Heatercathodeshort · 1st Mar 2018, 10:04 am

Just a couple of thoughts. Make sure the CRT coating is earthed to chassis. I checked for balancing resistors across the two frame scan coils typically 2k. The circuit does not show them and it would be interesting to see what happens if you introduce them.

Check the components in the feedback circuit for correct value.[C94 C95] then suspect the frame output transformer or possibly the scan coils. Try connecting a green spot VDR similar to the type used in the later 850 chassis from point D to Point C on the transformer. John

1st Mar 2018, 10:04 am	#26
Heatercathodeshort Dekatron Join Date: Jun 2005 Location: Warnham, West Sussex. 10 miles south of DORKING. Posts: 9,147	Re: Marconiphone VT161 17" TV Just a couple of thoughts. Make sure the CRT coating is earthed to chassis. I checked for balancing resistors across the two frame scan coils typically 2k. The circuit does not show them and it would be interesting to see what happens if you introduce them. Check the components in the feedback circuit for correct value.[C94 C95] then suspect the frame output transformer or possibly the scan coils. Try connecting a green spot VDR similar to the type used in the later 850 chassis from point D to Point C on the transformer. John