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CTV Sony KV1820E color issues

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gschwab
(@gschwab)
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@nuvistor well, I do have an ancient sweep generator with a marker generator that actually works pretty well. I also have a modern, digital frequency generator/sweep generator, so the equipment shouldn’t be the issue. The problem is that I don’t have the proper instructions and curves, and also not totally confident in my skills…

IMG 7785

The picture is much better in reality, I think it’s about as good as it could possibly be. That’s why I am really tempted to give the alignment a try…

 
Posted : 18/12/2023 9:24 am
gschwab
(@gschwab)
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@irob2345 I could actually borrow a spectrum analyzer from work too, we have some Rigol too…

Still nervous about the lack of instructions. Haven’t seen a test point to feed in a signal, but couldn’t I just feed it in where the tuner normally connects to the IF board? Also, I guess I would have to disable automatic gain control. It is all very tempting as it can be so fun to learn something new. 
I have an old Grundig 1510 that had some interference issues, the core of an inductor had broken and I had to adjust the curve after replacement. Was a really rewarding experience.
Good luck with your endeavors!

 
Posted : 18/12/2023 9:36 am
irob2345
(@irob2345)
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@gschwab

It would be helpful to get alignment instructions for a similar model. I have some but the Oz frequencies are very different and our TVs generally have rigorous adjacent vision and sound trapping to handle the crowded VHF bands as well as the sound offset of 5.5MHz.

Connecting the tracking gen output into the point where the tuner connects should be better than nothing. But it doesn't allow for the mixer output coil that tilts the top of the response curve.

Picture doesn't look like it needs alignment.... Anyway....

You'll probably need a pot and some clip leads to over-ride the AGC.

Do you go back far enough to remember the split valve shield that was used to inject the sweep in the early days?

 
Posted : 19/12/2023 9:38 am
gschwab
(@gschwab)
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Yeah, any kind of instructions would be helpful, but I doubt I‘ll have a lot of luck with that for a Sony. The picture using the DVD player is great, definitely no need for an alignment in this case. When using the HDMI to Scart adapter however…

The TV in question is older than me, so I don’t remember those shields from experience, but definitely have read about them!

 
Posted : 19/12/2023 3:33 pm
gschwab
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Just wanted to post a final update.  I got tired of the TV sitting on my workbench, so I connected the modulator and the HDMI to Scart adapter and started playing around with the color adjustments. The result isn't perfect, but much better than when doing it according to the (very limited) alignment instructions. Red is still a slight bit purple, but overall it's very usable. The B/W image is extremely sharp, and all things considered, it's a pretty decent bedroom set.

Thanks for all your help!

Gunther

 
Posted : 26/02/2024 10:53 am
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