(Topic ID: 219575)

System 11B no blanking LED?

By PinWiz1969

5 years ago



Topic Stats

  • 2 posts
  • 2 Pinsiders participating
  • Latest reply 5 years ago by wayout440
  • No one calls this topic a favorite

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#1 5 years ago

I have a system 11B board that I got for a decent price with a little bit of acid damage on it. I replaced the worst 2 PIA's at U41 and U42, and got the board running. I have my 5v LED, and then I have diagnostics flashing continuously. The blanking Led however is unlit.

I put the board in the game, It boots, starts a game, however I have only 4 segments of the displays are working. The weird part is, the working segments are evenly spaced out. From the left side, the fifth segment works, and then every eighth segment after. Also, feature lamps are working, but they are dimmer than normal. Sound works, switches work, solenoids do not.

I'm going to try replacing U51, as that is the display PIA. Does anyone have any other suggestions?

#2 5 years ago
Quoted from PinWiz1969:

feature lamps are working, but they are dimmer than normal. Sound works, switches work, solenoids do not.
I'm going to try replacing U51, as that is the display PIA. Does anyone have any other suggestions?

Put your finger on different IC's - especially PIAs - carefully - see if any are getting abnormally hot. In addtion to U51, you might want to also check U54...that one is involved with the lamp matrix.

To test the blanking circuit for proper operation, check U20 pin 2 or U43 pin 3 at power-on, using a logic probe. You should get an initial LO for a few seconds, followed by a continuous HI after the game has booted.

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