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Just finished building my TPD. It is recommended on the WIKI to test everything before soldering the led displays in place as they cover several of the 595 IC. The schematic is good but there is a lot more data that would make testing go much quicker and easier. Here are the work sheets I put together to test my TPD. Hope this saves you from having to work this out on your own. The following Dout assignments are with the TPD directly connected to the core with nothing in between. This is recommended for testing as you do not have to worry with anything else if your core is good.