Didaktik M: Part 2 - Troubleshooting

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Australia The Clueless Engineer
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Published on ● Video Link: https://www.youtube.com/watch?v=Y4QBHKSKh7M


Duration: 14:06
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It seems that the ULA is not generating a composite (Y) signal at all.

The PSU is supplying +22VDC ... way more than the 12VDC it should be ... so I created a small adaptor plug for my Mean Well PSU (same as for the PC-01 Lviv). This now was supplying +14VDC but still no image.

Checking the LM1886 and LM1889 ... still nothing ... all the way back to the ULA (pin18?).

However the ULA does appear to be generating RGBS signals (pins 10, 11, 12, 43) so maybe I can tap into those ... will require some work to remove the motherboard and install a new socket.

Here's an example:
https://billy48.speccy.cz/hardware/didaktik_m-rgb.html



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