Williams High Speed MPU Lamp Matrix Tail Chasing
Video
Summary
Chris Hibler troubleshoots and resolves a Williams High Speed MPU lamp matrix fault, documenting the diagnostic path.
Chris Hibler walks through troubleshooting a Williams High Speed MPU lamp matrix fault, tracing it through the TIP122 driver, diode D10, and a 7406 buffer before finding a row that now works. He then runs the display, sound, coil, and switch self-tests to confirm the board is healthy. The video is a hands-on repair log rather than news.
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