(Topic ID: 154750)

Help with Attack from Mars


By crashnt20

3 years ago



Topic Stats

  • 17 posts
  • 8 Pinsiders participating
  • Latest reply 3 years ago by Neal_W
  • Topic is favorited by 1 Pinsider

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#1 3 years ago

I have an Attack from Mars that has no sound. I am trying to trouble shoot the machine. I was going to try and trouble shoot the boards by swapping them out with my Monster Bash. Is this a good idea? and if so how do I swap them out. What chips do I need to swap on the board.

#2 3 years ago

Before you do a swap, check for the proper voltages and cracked solder joins (especially on header pins).

Also double check to make sure that the speakers are connected.

#3 3 years ago

Which board should check first. The CPU board or the Audio Visual board

#4 3 years ago

is the volume up?
Are the speakers connected.
Are the ribbon cables installed?
Does the cpu boot?
Is there power to the board?

You can swap boards without swapping chips, the game will sound like MB and have weird callouts.
Can u upload a photo of your AV board with the machine booted on?

#5 3 years ago
Quoted from crashnt20:

Which board should check first. The CPU board or the Audio Visual board

Check the voltages on the AV board first. It wouldn't hurt to check the voltages on the MPU either, but considering that the game works aside from the sound, the MPU voltages are fine.

Quoted from pincredible:

is the volume up?
Are the speakers connected.
Are the ribbon cables installed?
Does the cpu boot?
Is there power to the board?
You can swap boards without swapping chips, the game will sound like MB and have weird callouts.
Can u upload a photo of your AV board with the machine booted on?

Check all these things before considering swapping boards. For added emphasis: If there is a problem in your AFM that damaged the sound board, there's a chance it could also damage the MB's sound board. So, it's best to verify that everything else is correct before even considering a swap.

Go ahead and post good, clear photos--someone here might catch something that isn't immediately obvious.

#6 3 years ago

Don't just swap it over
It could damage your MB board

Everything is connected properly
Check all fuses
Check voltages

#7 3 years ago

Check even the connections to the bottom cab speaker (I hesitate to call it a subwoofer). I had a CFTBL with no sound at all and it was because of a single bad connection to the cab speaker. Now THAT was an easy fix. Good luck.

#8 3 years ago

Also check fuses on AV board

#9 3 years ago

looks like I have some work to do tonight. thank you for all the advice. I will check back with updates.
The AV board LED does not blink if maybe after a couple minutes occasionally and the classic startup tone does not sound when I turn on the game.

#10 3 years ago

I took a look at the board and could not see anything that looked like it is bad. I tried to check the voltage but unfortunately, I do not know how to do it. Here are some photos. If someone could give me some advice. Thank you. Sorry, I am still learning when it comes to the circuit boards.

thumb_IMG_1117_1024_(resized).jpg

thumb_IMG_1116_1024_(resized).jpg

thumb_IMG_1114_1024_(resized).jpg

#11 3 years ago

Looks like the LED is not lit on the AV-board,
measure like this
- Machine ON
- multimeter set to Volt dc
- Black pen on metal backboard
- Red on pin7 -> 12Volt
- Red on pin5 -> 5Volt
av_board1_(resized).png
av_board1_(resized).jpg

#12 3 years ago

Thank you so much zaza, for the instructions! I measured and pin 7 is 11.87 and pin 5 is 5.15. I do not know what that means. What are my next steps. Thank you again.

#13 3 years ago

Those voltages are ok.
The LED on the AV-board is controlled by the chip U26, but I have no documentation on what it should do during startup.
You can compare with MonsterBash or MedievalMadness.

I would first try the 34-pins and 26-pins ribbon cable from other machine to see if that works in this one.
On CPU-board and AV-board, pin #1 on J201, J202, J601 and J602 are on the left side so keep red line left.

#14 3 years ago

No luck on switching the ribbon cables. The led light is supposed to blink slowly but it does not blink at all. Anything else I can try?

#15 3 years ago

Pm sent

#16 3 years ago
Quoted from crashnt20:

Anything else I can try?

On the CPU-board, give U9 (ASIC) and U4 (6809 processor) a gentle push into their socket.

#17 3 years ago

Your DMD shows "sound board interface error", which is the function of the ribbon cables and interface chips. You have already swapped cables.

The next step is to remove the CPU and Sound board and closely inspect the connectors. Look for solder bridges or anything causing shorts near the connectors, as well as corrosion or poor solder connections. (photograph or label each connector, so you can get them all back correctly later.)

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