(Topic ID: 163081)

Bally display issue

By maestro

7 years ago



Topic Stats

  • 8 posts
  • 4 Pinsiders participating
  • Latest reply 7 years ago by maestro
  • Topic is favorited by 1 Pinsider

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#1 7 years ago

I have ab EBD with one of the displays having the top left vertical segment out. This is segment F on the stevekulpa repair guide. I have replaced the transistor on Q18, twice. I have also put in a new decoder. Segment still missing. I have moved the display to other slots and the segment is still missing. I put other displays where the faulty display was mounted and they work fine. Anything I can try besides the transistor or IC decoder? I've reflowed all the pins.

#4 7 years ago

Doesn't appear to be burned and pins look good. Its the same segment out on every digit not just one.

#6 7 years ago

r23 is 1.481k, r24 313.5k, r28 1.18k. I am assuming those are close enough. Book calls for 1.5k, 300k and 1.2k respectively.

#8 7 years ago

Found it. I started probing all the traces from the board to the glass pins. No continuity from R23 to the furthest pin on the left to the display glass. I reflowed all the pins before and did this one again but it still had no continuity. I put a jumper wire from that pin to the bottom of the board. Works fine. Must be a break in the pin I can't see. Oh well, I'm just happy its working now.

Thanks to all who contributed.

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