Pacman Ball Pusher Display Issue

[OhriteOhriteOhri]

Hi,

I recently bought a non-working Pacman Ball Pusher machine that had the issue of showing “Please call attendant”. When I got it home and powered it up, the display wasn’t working, just a blue screen. I checked all the connections and didn’t find any problems there, so I decided to replace the monitor.

After reading through a few threads, I bought a Mcbazel Arcade Game VGA LCD Display (links below). I’ve connected it to the gameboard using Waygo connectors. However, when powered on, the screen now shows a black display with flickering yellow and blue lines on the sides.

I’ve searched through several forums but haven’t found a definitive answer. If anyone can offer guidance or spot what I might have done wrong, I’d really appreciate it.

Once this is solved, I’m planning to create a full step-by-step guide on how to replace the display, which should help others in the same situation.

Many thanks in advance for any advice or insight.

Monitor - https://www.ebay.co.uk/itm/27349847...=0&osub=-1~1&crd=20251015093524&segname=11412

Mcbazel Game Board -https://www.amazon.co.uk/Mcbazel-Arcade-Converter-Monitor-Projector-Black/dp/B078ZDTLBJ

 

[Lurch666]

I had this issue. Have you set the rgb converter board to the correct settings.
Can't remember offhand what I did but had to tweak it to get the display to come up.

 

[OhriteOhriteOhri]

Thank you for your quick reply. I originally had the "No Signal" issue and thought it might be a setting on the rgb converter board. I found a helpful video (link below) and changed the SW setting to RGBS. That removed the "No Signal" issue, but now I'm getting a blank screen with two lines on either side.

 

[Georgian2]

Is the orginal LCD so hard to find? What resolutio dose it have or part number? I don't have this machine, just curious.

 

[Lurch666]

I tried to research the make of the original LCD and didn't manage to find much out about it.

 

[Georgian2]

Is it 320x240 7" ?

 

[Lurch666]

You could do with testing the screen with a known good RGB signal.
Do you have an arcade PCB you could plug the screen into?

Or another VGA screen (Old PC perhaps) that you could plug the RGB converter into?

 

[OhriteOhriteOhri]

Is it 320x240 7" ?

Looking at another post I believe the resolution is 480(RGB)×234

 

[OhriteOhriteOhri]

You could do with testing the screen with a known good RGB signal.
Do you have an arcade PCB you could plug the screen into?

Or another VGA screen (Old PC perhaps) that you could plug the RGB converter into?

Unfortunately, I don’t have another arcade PCB, but I do have an old PC monitor. I’ll try it out and let you know the outcome. Thank you

 

[Lurch666]

Just noticed from your pictures that you have two sync wires coming from the pacman sync going into the RGB converter.
You should only have the one white sync from pacmanball going into the composite sync of the RGB converter.

So the first pin should be the red,the second pin is green,third pin is blue then the sync pin is fourth with GND being the last pin.

 

[OhriteOhriteOhri]

Just noticed from your pictures that you have two sync wires coming from the pacman sync going into the RGB converter.
You should only have the one white sync from pacmanball going into the composite sync of the RGB converter.

So the first pin should be the red,the second pin is green,third pin is blue then the sync pin is fourth with GND being the last pin.

Thank you for checking. I’ve connected the white sync from Pac-Man Ball to the grey cable from the RGB converter. I’ve now disconnected the yellow converter cable and the orange cable from the Pac-Man Ball (photo attached). Is this correct, or do I still need to connect the orange cable? I tried using an old PC monitor with this setup but was getting the same issue.

 

[Lurch666]

Just found I still have a picture of my setup.
The grey wire goes from the connector on the machine to pin 4 of the connector of the RGB converter.
So yours does look correct.

From the LCD screen do you see anything of you press the menu button on the RGB converter?
Even if you don't have a good RGB signal going into the converter the converter should still be able to display messages on the LCD.

 

[OhriteOhriteOhri]

View attachment 46680

Just found I still have a picture of my setup.
The grey wire goes from the connector on the machine to pin 4 of the connector of the RGB converter.
So yours does look correct.

From the LCD screen do you see anything of you press the menu button on the RGB converter?
Even if you don't have a good RGB signal going into the converter the converter should still be able to display messages on the LCD.

That’s good — at least the wiring is now correct, thank you. Yes, I’m able to display the menu from the converter on the screen and adjust the settings. Could it be an issue with the board? However I’m able to hear the “Please call attendant” message when test mode is switched on.

 

[Lurch666]

Either the settings are not correct for the RGB converter to handle the RGB or there's no proper video output from the game PCB.
But unless you have a way of testing the RGB converter is working properly with the RGB input it's hard to tell.

You either need a TV with scart input that you could wire for RGB or something that can produce an RGB signal that you can test the screen with.
First I would try different settings on the RGB board to see if you can get the proper output.

 

[OhriteOhriteOhri]

Either the settings are not correct for the RGB converter to handle the RGB or there's no proper video output from the game PCB.
But unless you have a way of testing the RGB converter is working properly with the RGB input it's hard to tell.

You either need a TV with scart input that you could wire for RGB or something that can produce an RGB signal that you can test the screen with.
First I would try different settings on the RGB board to see if you can get the proper output.

Thank you for the help, I’ll be trying this tomorrow and will let you know how I get on.

 

[OhriteOhriteOhri]

I have tested out multiple different settings on the converter but still haven’t had any luck. I’ll have a closer look at the board and will update if I make any progress.

 

[Georgian2]

It looks like your original monitor might be ok and the problem is on the main PCB. You'll have to find a way to see if you have activty on the sync wire and on the RGB, wires.There are various tools to check. For sync you can use an multimeter if it has Hz writen on it.

 

[OhriteOhriteOhri]

It looks like your original monitor might be ok and the problem is on the main PCB. You'll have to find a way to see if you have activty on the sync wire and on the RGB, wires.There are various tools to check. For sync you can use an multimeter if it has Hz writen on it.

Great, thank you for the advice. I’m hoping to test the board over the weekend.