Just started working on my 17" Predicta Debutante. This set has been in our family for about 25 years or so now... Was working OK when put into storage about 20 years ago. Started out by testing all of the tubes on my TV7-D/U and found them all within spec.
Then pulled the chassis and cleaned most of the dust and dirt --- it was very nasty! Replaced the chassis and all tubes (except for the horizontal output tube) and brought it up slowly with a variac. Heard a bit of sound from a strong local station, so I decided to power it up again with the H.O. tube. With a little fiddling of the controls, I now have a nice and bright full screen raster.
Am also getting sound on two local stations (with a lot of hum), but no picture....
I found a few signs of prior servicing. One of the 9-pin tube sockets has been replaced and most of the paper caps on the main board apprear to have been changed at some time. Kind of crappy workmanship on these repairs, but look OK for now. Everything else looks untouched.
I'd welcome any advise as to what to do next. Where should I be looking for a problem with no picture, but good raster and sound? Since I have sound, wouldn't this indicate that the tuner is functioning properly? Should I be happy with the results of my first testing and plan to proceed with recapping? Any known trouble-prone components in this set that need to be addressed?
My plans for this set are to make it safe for occasional use. Would be neat to be able to demonstrate it with some vintage programming via a DVD or VCR.
Thanks!