If you have issues with your Multi and have checked everything that @xodaraP has kindly explained here: https://www.arcade-projects.com/for...ive-guide-to-fixing-your-cps2-multi-kit.7442/
then it's time to check the flashes. To do that, download the file attached, follow the instructions and let us know if you get an OK or ERROR on the LCD. IF you get an OK, it means that the path between microSD <--> ARM <--> Flashes works well.
If that's the case then most probably (and we are assuming that you tried with a different A+B board) the issue are the buffers/level shifters:
The exact model of the level shifter is: SN74LVC4245A
The level shifters involved in the Qsound BUS are: U66, U67, U68, U69 and U70.
The level shifters involved in the Sound Program Rom are: U71, U74 and U76.
The level shifters involved in the 68k Program Rom are: U55, U56, U57, U58 and U59.
The level shifters involved in the GFX BUS re: U34, U35, U36, U37, U38, U39, U40, U47, U48, U49, U50, U51, U52 and U53.
IMPORTANT! There are a lot of counterfait chips around, specially eBay. Make sure to check this thread: https://www.arcade-projects.com/threads/counterfeit-sn74lvc4245-ics.19409/
Feel free to post here your issues.
then it's time to check the flashes. To do that, download the file attached, follow the instructions and let us know if you get an OK or ERROR on the LCD. IF you get an OK, it means that the path between microSD <--> ARM <--> Flashes works well.
If that's the case then most probably (and we are assuming that you tried with a different A+B board) the issue are the buffers/level shifters:
The exact model of the level shifter is: SN74LVC4245A
The level shifters involved in the Qsound BUS are: U66, U67, U68, U69 and U70.
The level shifters involved in the Sound Program Rom are: U71, U74 and U76.
The level shifters involved in the 68k Program Rom are: U55, U56, U57, U58 and U59.
The level shifters involved in the GFX BUS re: U34, U35, U36, U37, U38, U39, U40, U47, U48, U49, U50, U51, U52 and U53.
IMPORTANT! There are a lot of counterfait chips around, specially eBay. Make sure to check this thread: https://www.arcade-projects.com/threads/counterfeit-sn74lvc4245-ics.19409/
Feel free to post here your issues.
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