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With the help of the bootleg pcb, I found out that the error is in the lower pcb. I'm thinking of a RAM error.

The R type pcb also has a graphic error. Could this also be a RAM error? View: https://youtu.be/Y3xMVlLEL2c?si=HOXizSckar-DiT5p

Thank you very much for your help!

thank you very much for your help. I'm happy. I looked at the schematic. I saw that the RAMs to which the 74ls157 are connected are elsewhere. I decided to check the RAMs. one of the 4 was faulty.

there are 157 in the area

Thank you very much for your reply. If I take out the RAMs, the moving characters disappear. I sent a picture. I have a logic probe. Unfortunately, I don't know what to see on which ttl pin? I checked the data lines between the EPROMs and the RAM, there is no broken line.

Ic128

unfortunately, I now see that an IC is missing, it must be a prom that cannot be replaced

thanks for the answer. the power supply pins are good according to the description. i will try this pinout this is what seems good: https://www.arcade-museum.com/pinouts-game/sindbad-mystery

Pics

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...

thank you very much for writing to me. https://www.arcade-museum.com/Videogame/monster-bash I also looked at the pinout here. I couldn't reconcile it with my PCB

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

bootleg does that. Is it possible that for some reason it cannot test the ram and freezes?

Yes. me too. I also have a bootleg pcb. That works. I replaced it with that

I measure 5.1V in the tank. I replaced the gray connector with a reliable working one. The screen has not changed.

this is what i used.tested on a test table. not in a cabinet

If all the switches are off, the second image is shown. White striped screen. The RAM next to the main Cpu Eproms is GOOD. I tested it.

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