,I have a bug (text missing) with my Tumble Pop game PCB, I have a blue screen instead of the high scores, I noticed that the 5 PAL have been replaced and one was a bit ugly resoldered with a faulty contact.
I dumped the roms (World ver OK), RAM & ROM test OK, I checked if there were small cuts, wires or repair stuff on the PCB : nothing at all, all seems OK with the multimeter.
2/5 jedec files are on jammaplus (thx to Muddy, the contributor), but they didn't help in my case.