(Topic ID: 229027)

Switched Light problem on EBD-LE

By mbeardsley

1 year ago

Topic Stats

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


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#1 1 year ago

My EBD-LE has developed a problem with all of the switched lights that are controlled by the Aux Lamp Driver board. None of these lamps work, with the exception of a couple of the left lane lamps which seem to be getting about 1 volt at all times (making them light, but just barely), even when they should be off.

The rest of the lights (both switched and GI work fine). I assumed that the Aux Driver board had failed and replaced it today with a brand new Alltek board. However, the problem persists, except that now those left lane lamps no longer get that phantom voltage and remain dark (which I guess is an improvement).

Before I spend the money on a new Main Lamp driver board, I was hoping somebody here had some ideas on how to better diagnose the issue.


#2 1 year ago

These issues are usually connector related. If the lamps driven by the main lamp board are working, buying another main lamp board isn't going to solve your problems with the Aux lamp driver board.

Make sure the Aux lamp board is getting power, hook up a multimeter (set to DC voltage) with the black lead onto test point TP2 and the red lead onto test point TP1 on the Aux lamp driver board. You should read about 5 volts.
If power is ok, the next single point of failure is the "lamp strobe #2" signal from the MPU board to the Aux lamp board. This is a grey wire from MPU board connector J1 pin 8 to the Aux lamp driver board J1 pin 3. Wiggle both of these connectors with the game in lamp test mode and see if the malfunctioning lamps start working

There are other signals from the MPU board to the Aux lamp board used for selecting lamps, but a bad connection on any of these other signals won't cause all lamps to not work from the Aux lamp driver board.

#3 1 year ago

Many thanks to you, kind sir.

You were correct that it was indeed a connector issue. The connector for the ground wire was cracked and not making a good connection. I moved the wire to an adjacent pin (also a ground connection) and now it is all working well.

Time to "Quit Talking and Start Chalking"!

#4 1 year ago

I'm looking to replace those old red molex connectors (with the black sliding covers) on the various boards, hopefully with the newer style white connectors.

I have several of the old ones that are cracked and/or fragile, and are probably the cause of another intermittent light problem that I have.

Does anyone know of the correct molex style for the cable connections? There seem to be a few choices of pin separation and length, etc.


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