Hello everyone!
I know, you are experienced guys, much more than me, so you probably was facing similar issues before and know what to do, or just can give me a clue.
I recently received couple of MVS's boards along with 161 in 1 banana cart from friend of mine.
MVS-1B has the sound issue (only coin and SSG sound works) but with the scope I found that YM3016 is failing. Pin 4 is active and I see synchro pulses coming from YM2610 and those pulses change when music should play and there is no activity on pins 10,11 on YM3016 - so it's apparently YM3016 (I ordered 2ea from Ali with dip socket).
The second board failing is MV1ACH. While inspecting the board I found that slot board is SLOT1AX instead of SLOT1ACH as it mentioned here and here. However slot boards look almost identical having 74LS245, so I guess it's not the issue.
I have SNKDAN diagnostic BIOS which shows that all test passed but I have graphical glitches listed below. I inspected traces and didn't find anything coroded or damaged. Just few traces are sligtly screched, but I checked the continuity and isolation from the traces beside. As it passes all the DIAGBIOS tests looks like it's slot and slot related IC's issues as I understood through internet searching and posts reading.
Below is troubleshooting had been done.
- I have 2 banana carts so I checked them both - both has similar issues, so it's not cartridge issue.
- I cleaned slots with alcohol and folded piece of paper. Paper was not dirty so I don't expect slots to be so dirty.
- While cart is inserted, I was trying to move it a bit to check the slot connectivity - looks like all good as no additional glithes appear while moving, so looks like the issue is permanent and not intermittent.
- I have supergun with voltmeter - so it's not a power issue.
There are few clues which experienced guy will recognize fore sure. I made them CAPS locked
This is Metal Slug start screen. "Slug" looks NEGATIVE and the whole logo is BLINKING.
These are UNIBIOS start screen and Exception handler from UNIBIOS which I see after game starts. All the games I was trying have similar handler appear. If I start Metal Slug it appears right after game starts. If I start Metal Slug 2 it appears after I run couple of dunes in the beginning of the game. Also there are some wierd graphic glitches which I cannot describe exactly as they are different. Neo Geo start sound is OK when game starts. Also I don't see any glitches when I see 161 in 1 menu on the screen and scrolling through it.
Any information for troubleshooting would be really appretiated.
I know, you are experienced guys, much more than me, so you probably was facing similar issues before and know what to do, or just can give me a clue.
I recently received couple of MVS's boards along with 161 in 1 banana cart from friend of mine.
MVS-1B has the sound issue (only coin and SSG sound works) but with the scope I found that YM3016 is failing. Pin 4 is active and I see synchro pulses coming from YM2610 and those pulses change when music should play and there is no activity on pins 10,11 on YM3016 - so it's apparently YM3016 (I ordered 2ea from Ali with dip socket).
The second board failing is MV1ACH. While inspecting the board I found that slot board is SLOT1AX instead of SLOT1ACH as it mentioned here and here. However slot boards look almost identical having 74LS245, so I guess it's not the issue.
I have SNKDAN diagnostic BIOS which shows that all test passed but I have graphical glitches listed below. I inspected traces and didn't find anything coroded or damaged. Just few traces are sligtly screched, but I checked the continuity and isolation from the traces beside. As it passes all the DIAGBIOS tests looks like it's slot and slot related IC's issues as I understood through internet searching and posts reading.
Below is troubleshooting had been done.
- I have 2 banana carts so I checked them both - both has similar issues, so it's not cartridge issue.
- I cleaned slots with alcohol and folded piece of paper. Paper was not dirty so I don't expect slots to be so dirty.
- While cart is inserted, I was trying to move it a bit to check the slot connectivity - looks like all good as no additional glithes appear while moving, so looks like the issue is permanent and not intermittent.
- I have supergun with voltmeter - so it's not a power issue.
There are few clues which experienced guy will recognize fore sure. I made them CAPS locked
This is Metal Slug start screen. "Slug" looks NEGATIVE and the whole logo is BLINKING.
These are UNIBIOS start screen and Exception handler from UNIBIOS which I see after game starts. All the games I was trying have similar handler appear. If I start Metal Slug it appears right after game starts. If I start Metal Slug 2 it appears after I run couple of dunes in the beginning of the game. Also there are some wierd graphic glitches which I cannot describe exactly as they are different. Neo Geo start sound is OK when game starts. Also I don't see any glitches when I see 161 in 1 menu on the screen and scrolling through it.
Any information for troubleshooting would be really appretiated.