Hey Everyone,

I am troubleshooting a Firepower master display with segment "c" out on the master display and players 1 and 2 displays. 3 and 4 player displays are fine.

These slave displays are working perfectly using a master display from my Flash game so I know the issue is with the master.

I replaced all of the 10KOhm segment resistors (R1-R14) as well as the 3MOhm R15, R17 and R19 but I still have the same issue.

I think the next thing I should look at is IC9 the 7180 but I am not sure.

Does anyone have experience fixing the master displays?

Thanks!

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Thanks for the replies guys. I didn't check the voltages on IC9, I just replaced it. I will check the voltages this time.

After replacing IC9, the 7180, all of the segments are working in the MDB and players 1 and 2. But now all of the displays on the MDB and players 1 and 2 are dimly lit and "fuzzy". Players 3 and 4 are fine.

I re-flowed all the pads on the MDB but the problem persists.

I also replaced IC5 and IC8 (the 4543s).

Next I will replace IC4 and IC11, the 6184s.

I replaced IC4 and IC 11 and no change. I also replaced the Player 2 and 4 Keep Alive resistors, (R16 and R 18).

I tried connecting the displays one at a time and still the same issue. These displays work fine when I have the MDB from Flash connected to it so I think the issue is isolated to the MDB.

I'm going to take a closer look at the contacts on the board.

Just an update. It turns out that I replaced IC9 with a 7180 and NOT a 7180A. The 7180 is a lower voltage chip, the 7180A is a direct replacement for the Williams MDB.

Once I put in the correct chip (7180A), it all worked. Just something to keep in mind when troubleshooting.

Thanks for everyone's help!