Again you are right
. R131 read in the mega Ohms so I guess it went out. I bought a new one and there was somewhat picture again
. The same as before it went white. I desoldered R145 and C52 the both were good.
All the transistors on the interface board are replaced now. I also replaced all the BF871 transistors on the neckcard.
I connected the raspberryPi with Pi2Jamma and got a good picture. A bit dim, but a good stable picture (see picture). I don't think a Pi makes use of the -5V. So that is probably the problem with the gameboards. I remember giving the PSU a cap-kit and after measuring the molex-connector which gave -5V. So I am confident my other cabinet uses -5V. But I will verify that.
I was not totally satisfied with the colors so I connected the Streetfighterboard in Testmode. I got the same colored barrs again.
I started tweaking the neckboard and suddenly the screen became redder and the scanlines appeared. Just like before
Then the screen went white with scanlines and I was back where I started.
When I turned the cabinet off and on again the screen was still white with lines, but I heard crackling. I looked and saw spraks comming from R131 to the heatsheald next to it. Turned the cabinet off immediately.
I think something is overloading R131. I soldered everything with great care. The only thing that gives me doubts is the broken ceramic capacitor I replaced. It's 50V but it is so small I am not sure anymore if it's right. (see picture).
Could it be that connecting without the -5V could cause an overload?
Do you know where I can look to solve this?