Williams system 3-6 driver board lamp matrix repair using a logic probe to identify the bad part

Fixing and refurbishing pinball machines is our specialty, but we also buy, sell, and trade pins. Need a part? If we don't have it, we can probably get it. We are a veteran-owned, fully licensed and fully insured Tennessee Small Business.

[@patrickmcshane579]

thanks, i have a similiar problems with the same machine Disco Fever

[@ETPinball]

Yeah these old boards are getting older. But fixing them and doing some upgrades (new interconnect and new chip sockets) can make them reliable again. There is a replacement 2-in-1 board that replaces the MPU and driver board, but it is a bit expensive (generally more than repair), and when the replacement boards need repair, it is harder to find someone willing to work on them. But it is surely nice to have options now.

[@patrickmcshane579]

@@ETPinball i am a novice but, and after watching your video I found i had to replace Q47 and Q69. Q47 was visually burnt.
Thank you so much

[@ETPinball]

@@patrickmcshane579 that's awesome you took the dive into the deep end!

[@alisuta2001]

In my Williams system 6, the Resistor R154 overheated and caught on fire while I was doing a test, it also cracked the resistor Q72. What would have caused that?