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DARKSOFT The Definitive Guide to Fixing Your CPS2 Multi Kit

Hi, had the cps2multi from saveyourgames.it since day 1 and working fine, last play was around 3weeks ago.
Fired it up tonight and got greeted with an "eeprom error" message from SSF2T New Legacy.
Reseated all the boards with no bent pins or any abnormalies from visual inspection of the boards.
Tried to flash 1944 (black screen on boot) AVP (a wall of error addresses) and lastly Choko (Ceeprom error, attached pic for reference)
How could I rectify this issue?

Any help appreciated
Usually an EEPROM error, means that the problem is with A or B Board. Do you have another one to try on?
 
Usually an EEPROM error, means that the problem is with A or B Board. Do you have another one to try on?
I have a spare A board (with some garbled graphics) from my old house, will fetch it during the weekend for some testing and report findings.
 
So I have a Champion Multi with the suggested B board.
Installed everything (JST Key cable not yet) and have the correct roms for testing. I can choose a game and can hear the sound of the game, but only get a dark green screen. It is actually very, very dark green, please check the pics below.

tempImageM5RcW7.pngtempImage0L5yEs.png

The used B board was a suicided (or maybe broken?) Zero 3 with battery leakage. I exchanged the roms to another board and they were ok.
I attached pictures of the pcb below as well.

IMG_6503.JPGIMG_6504.JPGIMG_6505.JPG

I saw many people reporting a green screen and fixing it by different approaches. I tried all that make sense in this case, but this one:
EXC5 may need to be temporarily shorted to remove keys that not been flushed

The question now is, is it a problem with the Darksoft installation or is the B board broken.
Since it boots up and plays sound it seems more likely, doesn´t it?

If is the corrosion damage, is it still fixable?

Any help would be appreciated.
 
I’m assuming the donor Board wasn’t checked as working before installing the multi onto it?

In that case, and given the battery leaked, that will be the most likely culprit unfortunately.

You could try shorting EXC5. But more importantly ensure you’re using a decrypted set.
 
If you have another B board you can use for the multi that would be the way to go. That board needs to be sent to someone who can check it over and repair it

The battery damage isn’t bad and I think it will be salvageable.

Looking at it briefly

- D1 is missing

- D5 is corroded and very likely dead

- 10M has had a trace repaired, but the chip may be damaged. There is also damage to the mask and possibly the substrate pins 11-15

- 10L should also be removed to check for corroded traces and clean up any damage

- Capacitor next to D5 is likely corroded and should be replaced

- Filter cap on the edge of the board is missing
 
I’m assuming the donor Board wasn’t checked as working before installing the multi onto it?

In that case, and given the battery leaked, that will be the most likely culprit unfortunately.

You could try shorting EXC5. But more importantly ensure you’re using a decrypted set.
No, I couldnt check the B board. Could you explain how to shorten the EXC please?

As the multi loads games and I can hear the sound, it is quite likely that the b board is at fault, right?

If you have another B board you can use for the multi that would be the way to go. That board needs to be sent to someone who can check it over and repair it

The battery damage isn’t bad and I think it will be salvageable.

Looking at it briefly

- D1 is missing

- D5 is corroded and very likely dead

- 10M has had a trace repaired, but the chip may be damaged. There is also damage to the mask and possibly the substrate pins 11-15

- 10L should also be removed to check for corroded traces and clean up any damage

- Capacitor next to D5 is likely corroded and should be replaced

- Filter cap on the edge of the board is missing

Thank you very much. This confirms that the B board should be the culprit, right?
 
No, I couldnt check the B board. Could you explain how to shorten the EXC please?
By shorting the EXC 5 capacitor mean to put a screwdriver who will touch simultaneously the both pins for few seconds of that location capacitor . something like in the image i attached 👍🏻 (you can do it , its easy)

ps : when you short EXC 5 capacitor , the power of the board/ boards should be OFF

IMG_1057.jpeg
 
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Without a working A and B set there is no way to tell for sure. But given the damage to your B board that would be the starting point
Thank you. A board is working without problems.

By shorting the EXC 5 capacitor mean to put a screwdriver who will touch simultaneously the both pins for few seconds of that location capacitor . something like in the image i attached 👍🏻 (you can do it , its easy)

IMG_1057.jpeg
Thank you very much! I need to power on the PCB at that time, right?
 
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