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Hello. I'm a little stuck. There is a graphic error on the pcb. first of all i read the contents of all eproms. All eproms match the mame database. After removing eproms E4, E5 E6 E7, the moving characters disappeared from the screen. I thought that the associated RAMs might be the fault. I took...

Hello. Could you help me with the pinout assignment for this PCB?the description I found is not good for this PCB. Thanks!

Hello. there is a gun smoke pcb that shows a white image after switching on. It is remarkable that the body gives a picture in a standing position, but it looks as if it has frozen. I don't know how to work correctly in the chin of the body. Can you help me? Thanks

Hello! Can I ask you for help? There is a Video Error Pcb. Can you tell me which is the Video ram based on the schematic? shematic : https://www.jammarcade.net/files/Schematics/Arcade/Out_Zone_Schematics.pdf?fbclid=IwAR14sD9ms8DKn9x0eNQQ_ruL3rLNlRcNe-hTUnVPWF-d1ZCCUBjS5JfMUHA Thanks!

Hello. I would like to know a little more about PAL ,GAL IC. The IC was missing from the PCB. Black screen after power on. I searched and found GAL16V8 Jedec file for a city connection PCB: GAL16V8 7U JEDEC. I tried burning it. He was very happy because the PCB started. Unfortunately, I can't...

Hello! I bought an untested donkey kong bootleg pcb. I looked for a pcb pinout for it. Something was wrong. (I'm stupid, I didn't read the eproms) I made the Jamma converter. I messed up a connection on a pin. After switching on, Smoke..... The sound ic (MB3712) emits smoke. I looked through the...

Hi there. I would like to start repairing a Sky Shark board. I want to ask for help. I haven't met a Taito board yet. Black screen after switching on... I read all Eproms. All flawless. I checked the operation of the 28Mhz quartz and found it to be good. The clock signal is received by the 68K...

Hi! I want to ask for help. I have a MV2F MVS PCB. I put any game card in it, it just shows a grid image. I cleaned both slots. I checked the corrosion lines. but I found no signs of damage. I took out the Diagnostic Rom. I see all tests as good. Does anyone know what I can do after this? Thanks

hi! I started repairing with a pitfall pcb. one day everything worked fine. I encountered this error another day. I started watching the sync. I saw that no signal is coming to the sync pin. the sync output goes into a 74ls68 for pin 11. pin 12 goes to an unknown component (PIC) Unfortunately...

Hello! Mvs 2 Slot NEO-MVH MV2F board The sound works interestingly Sounds are omitted in some places. Another board in the same game works well, not the game is wrong. Here's a video showing the issue. View: https://www.youtube.com/watch?v=bi35ZGVCmSs What could be the problem? Thanks...

hi! Do you have such a pcb, is it worth dealing with, repairing it? Parts are missing.... Thanks Robert!

Greetings to everyone! I am a beginner in the world of Arcade, I want to ask you for help. I got my hands on a bad PCB the DGB part was torn off when I got it. I was able to solder it back. I plugged in the Jamma connector and saw a blue picture. I noticed something was very hot One was the...

Hi ! I want to ask for help. after the green boot screen i see this picture.... Where should I look for the error on the board...I feel like this image would be an error message, but that’s not the only way you can display it.. Thank you in advance for your help!!!