MVS games with problems

[Jonap]

Hi friends, i have two MVS games with problems i want try to fix it with your help.
First of all say i clean cart pins with rubber + isopropilic alcohol.

Kof 97:
-------
The game reboots constantly, doesn't pass the initial bios tests.

With unibios reboot and later show errors like this:

Info: Visual inspect of PCBs seems fine, no bad solders, cut traces or corrosion...


World heroes 2:
---------------
This game seems work fine but some graphic textures "not all" are bad.

Maybe a reflow solder work on some chip? or reprograming some corrupted chip with eprom?

Thanks in advance for your help !

 

[Niko]

For KoF97 reflow the solder in the P-Roms.

For World Heroes reflow solder on C-Roms

 

[Neo Alec]

For WH2, does jiggling or pulling the cart up/out slightly while it's on help at all?

 

[BIG BEAR]

Most likely a bad p2 with Kof 97 and one of the c roms on WH2 looks like a cold solder joint.
Too bad you don't live in the states...I have rom sets.
BB

 

[Jonap]

Thanks to all for the tips, today y try to reflow those chips to see if the problem are a cold solder joint or something like else.

I put news as soon as i can.

Someone can tell me tipical problems of chips ( s, c, p, v, m etc ) for know next time?

 

[Misos]

If relowing the c roms on the World Heroes cart don't have any effect you can use the NEOGFX to open the c-roms and see which one
contains the affected graphics and replace it with a new eprom (27c160).

 

[Jonap]

If relowing the c roms on the World Heroes cart don't have any effect you can use the NEOGFX to open the c-roms and see which one
contains the affected graphics and replace it with a new eprom (27c160).

Hi Misos can you say more info about NEOGFX and how to use it? i dont know what is, thanks.