Sony KV-9200 Repair

The TV did not look bad to be 50 years old, but had a bad pincushion problem.

I started out by replacing the electrolytic capacitors on both the VH (Vertical Horizontal) and tuning boards, since this is a 50 year old TV and I could see signs of electrolytic leakage I did not try to find out which ones were still good. I got two service guides, the orginal one from Sony and also a Photofact one.

There was one interesting one that you can see as the large aluminum one in the middle of the TV, it's C904 but it has two capacitors in one 470uf and 10uf both rated 200 volts. These are not common anymore so I had to get creative and figure out how to mount two modern capacitors in the same place.

This what the wiring looked like, red was the 470uf, white and black was the 10uf and the black was a common ground.

I got it unsoldered and out of the TV.

Then I started to remove the inside by drilling a hole.

Once I got the hole started I was able to use some needle nose pliers to remove bigger chunks.

I then removed enough so only the core remained.

The core came out pretty easy after that and it left a good amount of space to put the two replacement capactiors inside the shell.

I didn't get a picture of the large capacitor reinstalled, but I just connected the two capacitors together on the negative leads and used some short leads and shrink wrap tubing to make it fit into the shell. After all the capacitors were changed out, except one on the RF board that had a shield around it so couldn't be unsoldered, the pincushion issue is resolved.

The center lines look very good, but there is some issues around the sides that from what I read is dynamic convergence and requires multiple adjustments for TVs that don't have integrated circuits. So far I have not found a way of compensating for this, but what is not visable on the still picture is there are some light vertical lines that seem to move across the screen. I'm guessing it's some kind of grounding not working but so far haven't isolated it and this is a bigger issue than the dynamic convergence issue.

Troubleshooting will continue on part 2.