Another k7000 need Help!!! p538 Top portion of image folded over

[asuitor]

So K7000 p538 25 inch is a bit of a beast, I started off with a Image like this. Since then I have done a full cap kit, no change. The B voltage is 130, Originally my pin 6 on my IC3 was reading 30v, so I swapped out the IC2 from another board (not sure if the IC2 was fully working) and now have 16 volts on pin 6 on the IC3. I also swapped out IC3 with another spare I had and same issue. Tested Resistors 90 and 91 both are exactly what they should be. The 50/60 pot shrinks the image and expands the image when I adjust it, but the fold stays. Does anyone have any suggestions as to where I should go next? I am thinking about ordering new IC2 and 3 to see if that makes a difference. 

[Zebidee]

I know you said you've done a full cap kit, but this looks like classic vertical stage electrolytic caps failing. I'm no expert on K7000 specifically but I expect there's only one or two caps near the vertical IC to check. After that the IC(s), which you're already checking, and follow the power supply back to source.

[asuitor]

When I got the cabinet, the board looked like it had new caps (last 5 years or so) but I did a cap job anyway as a launch point. I can say at this point I am 99% sure it is not a cap issue. I did take used IC2/3 off another board to test but had the exact same symptom. I replaced the cap right behind the 50/60 pot. I have 24 volts on pin 6 now, but the image won't expand to the top 3-4 inches of the screen it just squishes. I am thinking about doing a pot kit next to see.

[Zebidee]

Before you go replacing stuff, Maybe grab some Deoxit spray (or whatever they call it) and give the pots a squirt and a twiddle.

[princess prin prin]

Replace C48.

[asuitor]

Replaced C48 again, no change, Cleaned the pots with 91% alcohol, no change. I did measure R104 (ceramic resistor) its rated at 15 ohms, but is reading 8 ohms. I have ordered a replacement for that and will swap it out shortly too. 

[princess prin prin]

Do you have 24V on pin 3 of the vertical IC? You want to have 24V on the anode (=IC3 pin 6) but also on the cathode (=IC3 pin 3) of D25.

[asuitor]

I have 25v on pin 3 and 6. What is this odd space under c52 that is empty, says c68.I tried searching that cap number but could not come up with anything. Diode is also fine.

[princess prin prin]

C68 is populated when IC3 is an LA7831 (across pin 4 and the negative of C50). See the schematics of the 25K7000. What's your IC3?

[asuitor]

IC3 is a LA7833 I was swapping in a la7831 from another board. It had the same issue but I did not try moving the the leg of c52 to the 4th pin when I changed the IC3 chip out as highlighted here https://forums.arcade-museum.com/threads/25-k7000-vertical-oscillation-foldover-and-super-hot-ic3-repair.553969/, but I did try moving the c52 leg to pin 4 with the LA7833 and it was a full collapse when I did that. Maybe I should try a new LA7833?