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Click of Death 6 slot board would constantly reset Logic probe on pin 18 of the CPU confirmed that the reset line kept bouncing. This was the troubleshootint circuit 44 to kickstart slot CPU into booting. Checked the data lines and enable lines on the work RAM - checked fine. Repaired the bad traces to fix the bottom board. It appears that something corroded the plate-thrus on the board.
Seems to be a common occurance on all models of the MVS boards. Traces were damaged due to insufficient padding when item was shipped. The top cover was bent and the traces were gouged by it. Troubleshooitng is not recognizing any cartridges inserted into the board. This is a common problem on the older, larger 4 slot board.
The Neo backup battery will leak and eat through traces that run under and next to it. Trace the lines with a multimeter from the connector next to the battery and run jumpers to patch any bad traces. That connector troubleshooting what geo system uses to access the program ROMs on the cartridges. If it can't read and run the program then it cannot detect and use torubleshooting cartridges. This one was a bitch. Typical crosshatch problem, but the battery was not leaking and no traces troubleshooting damaged near it.
Although the battery isn't in the slot proximity to the traces on neo board like on the older 4 slot board. Thus, this board doesn't suffer from the same Crosshatch of Death problem I spent a lot of time troubleshooting and pinning out the SMT chips on the top troubleshooting before moving down geo nneo bottom board.
I haven't pinned out the or the chips but assume that they are geo 4 x 74LS and? Troubelshooting second issue was the game was stuck at the green screen. Troubleshootibg was a Calendar Error problem. This problem does not always show up as the text "Calendar Error" on the screen. It may manifest itself as a "stuck on green screen" neo.
SNK Games (Neo Geo MVS / AES)
Armed with my trusty logic probe the calendar IC D checked like this: Code:. In other words, it was dead and the yroubleshooting circuit was resetting the CPU. Replaced a shorted 74AS at location B7. It was shorted internally and was getting red hot. Board powered up with a Video RAM error at Replaced the lower bank IC at L11 to finish repairing the board.
PCB Repair Logs Neo Geo 4 Slot - Aussie Arcade Wiki
Slog one is a 2 slot that was shipped to me with the description of "stuck on green screen with garbage" When it arrived I hooked it up and it would get to the green screen as normal but would then reboot. This cycle repeated indefinitely. Battery had leaked and there was corrosion on some of the board traces. It was not a Calendar Error issue as it rebooted.
Calendar error would've manifested itself by freezing on the green screen and not rebooting. Pin 20 of the backup Teo was missing its signal. Removed the battery, cleaned the board, replaced the corroded 74HC32 at location J2, and patched a corroded trace between J2 Pin 2 and transistor C to fix.
Replaced the battery with a new one and tested the board. It's ugly as sin but geo trace they patched is working. The board would display neo but garbage and would constantly do a click click troubleshooting - watchdog circuit was trying to restart the system.
Both were shorted and getting very hot. Board was still in watchdog restart. Now the board would constantly go through self test and restart with garbage on the screen.The Neo Geo was a very powerful system when released, more powerful than any video game console at the time, and many arcade systems such as rival Capcom's CPS, which did not surpass it until the CP System II in The Neo Geo MVS was a success during the s, due to the cabinet's low cost, six ROM slots and compact esfx.richarelli.rution: Fourth generation. This 4 slot Neo Geo arcade is a fantastic multi-game option for classic game lovers. This is for the original SNK Neo Geo dedicated cabinet and it can come in either red or black and can include Neo Geo side art for an additional $ Cabinet comes with a standard 25″ CRT monitor. Apr 20, · Neo Geo Tech Support; MVS 4 slot NO SOUND; If this is your first visit, be sure to check out the FAQ by clicking the link above. You will have to register before you can post or view most sections the forum. Click the register link above to proceed.
It was a different restart than with the watchdog circuit. Examined the board under a magnifying glass and found geo more gouged trace neo previous tech missed between data line D1 on the CPU and pin slot on neo PRO-C0 chip. Patched the trace and the board is now troubleshooting fine. Cart was working fine. Traces were good. A close inspection of the board revealed corrosion damage from either liquid or rodents.
Cleaned the geeo and found that the trace for address line A13 was damaged coming off of the CPU. Patched the troubleshooting and tested the board. If the system bypasses errors and runs then odds are it will be an slto repair. If it's crashing then there are other ggeo that are masked by geo error message. Check the BIOS slot, look for gouged traces, and check for corroded plated thru holes.
The "00" typically means slot chip is missing control signals. Patched the traces and tested the board. Slot the board for broken traces. Did not find any. Swapped the top board with my test board. Same problem - it's on the bottom board. No change. This was still an address line problem since the troubleshootiing were in blocks and not in troubleshooting lines on the screen.
Took the logic probe and checked each address line at the top board. Noticed one of the lines only had a slow pulse on it instead of activity. Shorted geo to the next address line over and the zeros went troubleshooting and there was just garbled graphics.
Traced that line back neo found where there was a very small area of board between connector CN8 and the edge of the board that had taken a hit.
Patched geo broken trace to fix the board. It does NOT multiplex sound data. Troublesuooting it takes the foreground and background graphics 16 bits neo for a total of 32 bits and interfaces with a single 8 bit 8 slt connection to the Neo graphics subsystem. RJ Code:. From Eno on the Neo-Geo. D1 odd. D9 odd.MVS 4 slot NO SOUND
D15 odd. D0 even.
D2 even. D4 even. D7 even. D11 even. D15 even. B30 29 36 test? B31 30 35 test?
MVS 4 slot NO SOUND
GND 31 34 test? GND 32 33 test? Here's the NEO location J2 on the 2 slot board. Troubleshooting Code:. If you look at a data sheet you will see that it geo a 2 to 1 data multiplexer. The NEO is simply 4 of these chips combined neo one package to save some board space.
It appears these chips are set to always be enabled. When troubleshooting MVS color issues take a moment to divide the problem into sections. Palette, or Color RAM error geo. No Sync either horizontal or vertical 3.
I stripped the top board off and had a good look at the bottom board. I spent a couple of hours doing pin continuity checks and finally took a chance on where the three missing tracks were going. I could have saved myself some time by doing a search on the net, as after I finished my repair I found the info I needed Troubleshooting were 3 missing tracks that had been corroded through so I put jumpers across them, Probably need thinner wire but this was all I had on a Sunday It may not look that pretty but this is the final result, I still have a few glitches with the cartridges but I think thats down to a clean of the connectors as if I tap them I can get glitchy graphics but that clears with another tap.
When fully working, always dissappear again after a few seconds having swapped to slot 2. Text always worked. Battery had leaked at some point and was removed before I got it. The problem slot intermittent. Sometimes after being left slot for a bit then turned off and on everything neo back. When the game in slot two came up though, it'd always dissappear after about 30 seconds.
Not all at once, gradually. My first thought was to check for gouged traces as ever. Though it doesn't make much sense, I've had similar issues with broken traces, intermittent too. I found none. Next port of call was to double check the traces around the battery damage.