Multi M72 small glitchs

[raffy92]

View: https://youtube.com/shorts/8U_WfpNKULE?si=pTQ4hwwedEZ2hxqC


I just opened a new post for my problem of glitches with my multi m72. As you can see on the linked video, there are some small glitches located. I did a cap kit, I checked the cables continuities. I reinforced the boards system by adding more legs at the middle of the boards.
I also increased the 5V to 5.10V, as it was suggested, but I didn’t see any difference.

If you have any other suggestions please tell me

 

[raffy92]

This is a side view of the multi m72

 

[Crunch]

Errors in the background sprite layer. Was the PCB working before you installed the kit? Hopefully so and you just physically damaged a trace and can track it down.

 

[raffy92]

Errors in the background sprite layer. Was the PCB working before you installed the kit? Hopefully so and you just physically damaged a trace and can track it down.

Sure, the game was working perfectly before installing the multi, even just after, I could play and the next week I observed these glitches. The pcbs are clean I checked again today, I could not seen anything wrong on the pcbs.

 

[Crunch]

I would unseat and reseat all the socketed EPROMs, clean them and possibly reburn the one containing background graphics then. Also ensure the kit pins are cleaned and reinserted as well.

 

[JohnRambo'sKnife]

Almost always worth checking the rom sockets. I despise machine headers.

 

[raffy92]

I would unseat and reseat all the socketed EPROMs, clean them and possibly reburn the one containing background graphics then. Also ensure the kit pins are cleaned and reinserted as well.

Is there a schematic somewhere to know where are the background graphics EPROMs ? Thanks

 

[raffy92]

Almost always worth checking the rom sockets. I despise machine headers.

How to do this ? With a programmer ?

 

[JohnRambo'sKnife]

Check physical connection. Usually pressing on them while running will cause the fault to partially correct.