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  1. UMK3 board playing blind 7407 inputs shorted to ground

    UMK3 board playing blind 7407 inputs shorted to ground Need a bit of guidance here. I have a board where everything works fine, but it's playing blind, it's definitely passing the hardware test and it has sound. It's outputting the correct resolution and refresh rate but just a blank image...

  2. UMK3 - bad U86 and no sound.

    I have another UMK3 board here that I'm kind of stumped on.. It has no sound/test tones and U86 comes up as bad. I have good -5v and I've already replaced TL084CN at U92 and the 2200uf capacitor. I've tried swapping a U57 from another board but sadly both of these boards seem to have no sound...

  3. UMK3 only boots when pressure applied to corner + missing an SMD cap

    UMK3 only boots when pressure applied to corner + missing an SMD cap So I picked a "dead" board but it'll boot when I apply pressure to the corner near the heatsink next to jamma connector. Otherwise it'll just have a black screen and only one led will be lit. I've tried applying pressure to...

  4. Monitor slightly shifting colors after chassis swap

    Monitor slightly shifting colors after chassis swap I replaced my dead chassis in a Korean DDR cabinet with a super cheap Chinese chassis from Aliexpress To my surprise it worked, but I get a weird color shift now. The monitor did not do this before on the original chassis. First I thought it...
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