VARTH graphical problems (US board)

[Sir Arthur ahf]

Hello guys,

Have a problem with a Varth PCB

Apparently it was ok when the seller checked it before shipping (had some pics from him, nice guy)

It was well protected but the thing is that when I got the PCB this is what I can see...









Any ideas?

Varth is a CPS Dash, so can I try the A board of a CPS-I?

Cheers,

- Art

[caius]

Most likely C-BOARD committed suicide.For first measure voltage of the CR2032.Even if you can read +3 Volt, it could be still suicided.Try to revive it with the old procedure or using the Eduado Cruz desuicider.

[MKL]

If it's a Japanese board because the other versions didn't hava a battery.

[Sir Arthur ahf]

Yeah, that's odd cos is a US board (no suicide battery)

It was working perfectly before the shipping

[caius]

If it has no battery backed-up C-BOARD check the connection between A-BOARD and B-BOARD.

[Sir Arthur ahf]

Have tried that Caius, apparently everything looks ok

[MKL]

If it's not the A-board it's most probably a bad C-board. One from Final Fight should be compatible.

[caius]

It uses the CPS-B-04 ASIC on C-BOARD.If you don't have another same C-BOARD, PM me and I will explain how to use a CPS-B-21 instead.
Anyway, as I sad, check also connection between A-BOARD (I didn't sayd the A-BOARD itself) and C-BOARD, have faith in me with thousands of repaired arcade boards!

[Sir Arthur ahf]

Terrific Caius and MKL

Ta!

[Sir Arthur ahf]

If it's not the A-board it's most probably a bad C-board. One from Final Fight should be compatible.

I have tried. I get more colours but the image gets distorted

[MKL]

If the markings on the CPS-B- ICs are identical that would be an indication that the problem is not on the C-board.

There's a Final Fight version with a different CPS-B:

http://www.arcadecollecting.com/info/cps-b_numbers.html

[caius]

If he uses another C-BOARD with the CPS-B-04 ASIC there is few to discuss about, that Final Fight with scrathed off ASIC marking is rare to come across.So, please post here a picture of your B-BOARD with the hardware revision silkscreening readable as well picture of the C-BOARD witt the ASIC marking readable.

[Sir Arthur ahf]

Thanks guys

[Sir Arthur ahf]

[MKL]

So did you swap the A-boards?

[caius]

Well, C-BOARD are the same so you swapped the good one of Final Fight and it still doesn't work, the fault is elsewhere.So, as suggested, try a good A-BOARD.If it still doesn't work, the problem is on B-BOARD.Does the game still play although with bad graphics or it crashes?If it crashes, you should check the two program ROM as well their sockets.Judging from your faults, I don't think the four GFX MASK ROMs could be the cause but dump them anyway.Anyway, I can say I had a similar problem on Varth, problem was bad connection between A-BOARD and B-BOARD.

P.S.
Check also the PAL @1A, it generates the /OE signal for GFX MASK ROMs.

[Sir Arthur ahf]

So did you swap the A-boards?

Yes, I will send you a few pics later. There are more colours but the image gets "dirty"

@Caius; which A boards can I use? Any other CPS game?

[caius]

@Caius; which A boards can I use? Any other CPS game?

Yes.

[Sir Arthur ahf]

Apparently the problem is with the B one

I have tried the A one w/ Final Fight and works fine

You can barely play the game but not crashes