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There are couple of folks here, who are knowledgeable in TVs.
Tthis said, at least one of them participates in Facebook's "Predicta" group, where most people are knowledgeable about the Predicta.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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Look at the vertical wave form. If caps have been replaced in those circuits there may be an issue. Check all ground connections especially if they are riveted to chassis, solder those with a large bolt iron. Be sure there is no heater/cathode leakage in the vertical oscillator and vertical output tubes.
GL
Chas
Pliny the younger
“nihil novum nihil varium nihil quod non semel spectasse sufficiat”
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You set is having trouble locking after the vertical retrace interval..Have you adjusted the coarse horizontal hold and ringing coil as described in the service info? Also, looks like you might be using a signal source with macro vision copy protection
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Also what effect does adjusting the horizontal hold and contrast have?
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Bob Andersen Wrote:Also, looks like you might be using a signal source with macro vision copy protection.
Although I don't work with TVs a friend who buys them and sells them on the auction site has enlisted my aid in the past. He has no way to create an NTSC signal to show that the CRTs are working. What I bring for the purpose is my first DVD deck, a single-layer Sony, and a couple of old DVDs of "Burns and Allen" and "You Bet Your Life," plus an RF modulator.
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/
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Hello guys,
Yes , bob brings up a good point and that why I have macro vision copy protection union that corrects that problem this was a common problem with older tv's
I used to sell those units at my tv repairshop.
Sincerely Richard
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Aaaah yeah. Macrovision. Good old “flagging “. As mentioned a filter might help. Available on Amazon. I use on on my dvd recorder. Works great! Had a similar problem on some of the older Sears sets, seems like we had to change a couple resistors in the horizontal section. About all I remember tho. Been a few days.
If I could find the place called "Somewhere", I could find "Anything"
Tim
Jesus cried out and said, "Whoever believes in me , believes not in me but in him who sent me" John 12:44
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Thanks for the ideas everyone. I just got the chance to sit down and play with the set today, however when I powered it on there is no video at all aside from the raster. I'm going to go through and check connections in case something may have come loose while sitting somehow. There was a brief 15ish seconds where video and sound came through perfectly, but it quickly went away and I'm not even sure what happened to get that far. I will update when there is progress to report!
