Trying to get 15Khz to work on Sony CRT TV

[Jehuty]

Since i saw a X68000 running on an Sharp trisync Monitor i try to get the 15khz mode from games to work on my Sony KD29X2D CRT-TV without success.
I own a CZ-600 and a X68000 XVI. Tried severel scart cables and adapters. One Cable with H and V Sync tied together (from Retrocable Shop), another one with the passive sync combiner from Bobs RetroRGB site and a UMSA from Arcadeforge.
While the CZ-600 does a good Picture on all tested games the XVI has several problems.
Capcom Games like Final Fight, Street Fighter 2, Daimakaimura work and have a good quality. But Mahou Daisakusen has too much blue, Sega titles (Afterburner / Hang On / Alien Syndrome) and Overtake mess totally up.
Best results on XVI are with the cable that ties H/V together (but broke on a try my 74ALS05 conected to OSSC)

I also tried to downscale with a DIY GBS-C, but that thing doesn´t really sync. Extron VSC500 does onyl 480i on output.
I already did a recap on the video board, no success.

So does anyone have an idea why the Colors on my XVI are so messed up ?
What can i do to get a 240p picture on my TV. Or is it while the X68000 does 256P ?

One thing, the XVI via the scart cable hooked up on OSSC does the right colors.
So CZ-600 on TV works, but XVI with same cables on OSSC will also work but not on CRT.

Attached some pictures.

1. Mahou to Blue on XVI
2. Mahou on CZ600, same TV, same cable
3. Afterburner on XVI
4. Afterburner on CZ600, same TV, same cable

[spectreman]

This should solve your problem, the USB cable is for 5V power supply, to generate a mixed synchronized video signal, a normal smartphone power supply will be fine.

They ship internationally:
https://buyee.jp/item/yahoo/auction/d1140246292

[Jehuty]

i am a little bit sceptical if that cable would solve my problem. It seems that in the cable is a active sync combiner like in the UMSA.
Yesterday i tried the XVI on an Grundig CRT TV and there are the colors right, with the same cables.
So, the CZ-600 works on Sony and Grundig while the XVI only works on the Grundig. Sadly i wanted to use the XVI with the Sony.

[spectreman]

i am a little bit sceptical if that cable would solve my problem. It seems that in the cable is a active sync combiner like in the UMSA.
Yesterday i tried the XVI on an Grundig CRT TV and there are the colors right, with the same cables.
So, the CZ-600 works on Sony and Grundig while the XVI only works on the Grundig. Sadly i wanted to use the XVI with the Sony.

From what you tell me, I think it's your Sony TV, which now doesn't work as well as it should.

[LowDefAl]

I don't have an XVI but the Expert has separate potentiometers for each colour, so I assume the XVI has them too.

[Jehuty]

Meanwhile i think too that it is a fault of the Sony TV, not the XVI  The XVI has the pots too, but that
isn´t the problem cause on other displays the colors are right.
i hope that someone has an idea or had a similar problem before.