MS9-29A 15khz Sync(?) Issue

[FPJ]

I have two MS9-29A's in a Vs City and I did a cap kit on both because they were both looking pretty dull. One is great now, the other seems to no longer want to sync. When I hook up the TPG, you can see something for a split second and then I lose image entirely and there's that telltale high-pitched noise like it won't sync. This is only on the 15khz signal. If I switch to a 24khz signal, at first I had an image but it was wonky and then adjusting the HH24 pot got it solid. So whatever is happening is only affecting the standard res.

I have triple checked to make sure I didn't put any caps in wrong, they're all in the right positions. I've tested a bunch of parts along the horizontal line, comparing to the good chassis and haven't found any bad transistors or resistors yet. I went ahead and tried replacing the LA7853 at U550 and it changed nothing. I've checked the HOT, Q508 and a bunch of other stuff. B+ is good, it's right at 76v for 15khz.

Any ideas on what else I could take a look at that would only be affecting the sync on 15khz?

 

[brad808]

Did you check the HH15 pot as well? To adjust and actually measure to make sure didn't accidentally break or something.

 

[FPJ]

Yeah, I should have mentioned that, I thought about the fact that I didn't mention it after I went home. I tested the pot and it is good and no amount of adjusting will get an image to sync. It changes the pitch of the noise, but nothing visible happens. I also checked all over thoroughly for bad solder.

 

[Asure]

This monitor is not auto sync, are you switching the 15/24 header on the board too? Maybe obvious.. but you never know..

 

[FPJ]

It is auto. Some of the later MS9-29As have auto switching.

 

[Asure]

You didn't state it in the post and i cannot see the relay in my crystal ball. Autoswitching 29A isn't common, so i had assumed you didn't have one.

Does the relay click at all when you change the tpg from 15 to 24? You didn't tell us this. Maybe post a pic of the chassis.
As 15K was working before, check your caps and work. Did you buy the 'kit' online or replace caps as you pulled them?
I never buy kits, who knows how old they are and how long they were in the bag. I hate how these are now known as 'magic bullets fix all' when in reality they don't.