(Topic ID: 219262)

Data East Alpha Display Issue

By Pintopia

1 year ago

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  • 5 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by Inkochnito
  • No one calls this topic a favorite


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#1 1 year ago

Hello I have a Dataeast Simpsons game with rebuilt power suppy and display recapped with the following issue:'

On the lower display only there are two segements (m and i) that are turned on when they shouldn't be for certain characters? When the character scrolls to the left the improperly lite segments travel with the character.

My question is this an issue with the logic on the display board or is it coming from the cpu? Any thoughts are appreciated.


#2 1 year ago
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#3 1 year ago

Looks like you have a connection between the m segment and the other (I doubt "i" exist).
You might consider replacing the U16 or U17, but the ULN7180 chips are expansive if you can find it.
Check if you have the segments named right.
The schematics do not have a "l" or "i" segment.
Take a look at the schemaics page 55.

Also look for a solder splatter....
How are the voltages at the display?


2 months later
#4 1 year ago

Wanted to update for other's that may run into this issue. Turned out to be the display glass causing the issue replaced the display glass and now working fine.

#5 1 year ago

Sometimes if you look closely at the glass edge you can see some black oxidation at the contact points.
If that happens they may bleed though to the adjoining contacts.
Oxidation is a conductor...
Replacing the glass is the only option in that case.


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