Ok, here is the story. I sold my MINT galaga upright mini to a friend of a friend. It work GREAT, but occasionally had a RAM 4L error. Well, they got it home and played it a couple hours and got the error. They know NOTHING about electronics, yet decided to pull the board out. They found a PCB label that said 4L and they pulled the chip out to "clean it". This wasnt even the correct chip, as 4L is actually the PROM on the video board.
Unfortunately, they broke off legs. Im also pretty sure that they either damaged something else, or originally put the chip in backwards and powered it on. Nevertheless, nothing works. I just get a white screen with a few odd blocks of color.
I took the unit home and tested the voltage from the power supply, and it was 1V low. So, this was most likely the original problem. I repaired the broken pins and put a new socket in the board, in case this was part of the issue. I also put a nice power supply in that is putting out just over 5V. Still the same problem...
I think that they created a short in something on the video board. What? No clue. I can say that the power supply acts totally fine with just the CPU board plugged in, but as soon as I connect the video board to the CPU, the voltage drops by close to 1V and a short is sensed.
So....I have pulled all socketed chips out and still have the same symptoms. I dont think a chip replacement will solve my issues.
The buyer agreed to buy and new board and I will put it in. What are my options?
Honestly, I am hoping for a modern replacement for the old board. I usually work on pinballs, and dont understand what Jamma is. I could get the original, but would like to avoid that. I dont mind multicade, but the galaga joystick is only bidirectional.
Any advice?
Unfortunately, they broke off legs. Im also pretty sure that they either damaged something else, or originally put the chip in backwards and powered it on. Nevertheless, nothing works. I just get a white screen with a few odd blocks of color.
I took the unit home and tested the voltage from the power supply, and it was 1V low. So, this was most likely the original problem. I repaired the broken pins and put a new socket in the board, in case this was part of the issue. I also put a nice power supply in that is putting out just over 5V. Still the same problem...
I think that they created a short in something on the video board. What? No clue. I can say that the power supply acts totally fine with just the CPU board plugged in, but as soon as I connect the video board to the CPU, the voltage drops by close to 1V and a short is sensed.
So....I have pulled all socketed chips out and still have the same symptoms. I dont think a chip replacement will solve my issues.
The buyer agreed to buy and new board and I will put it in. What are my options?
Honestly, I am hoping for a modern replacement for the old board. I usually work on pinballs, and dont understand what Jamma is. I could get the original, but would like to avoid that. I dont mind multicade, but the galaga joystick is only bidirectional.
Any advice?