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Bad trace. Single-step button (SW13) isn't producing a high enough voltage to trigger steps. Replace C10 with 100K resistor, and bridge out R44 with a 7-segment display with LED backlight http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft43-ae.pdf TFT-graphic display 640x480 16 bit colour TFT-graphical display 800x480 16-bit colours with capacitive touch panel http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft70-ae.pdf TFT-graphical display 800x480 16-bit colours with capacitive touch panel http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft70-ae.pdf TFT-graphical display 800x480 16-bit colours http://www.lcd-module.com/fileadmin/eng/pdf/grafik/ediptft70-ae.pdf TFT-graphical display 800x480 16-bit colours and touch display STN/FSTN LCD 192x64 dot https://www.buydisplay.com/download/manual/ERM19264-1_Series_Datasheet.pdf ERM19264 Graphics Display 192x64 2 Digit 7 segemnt red/green LED Single digit 7 segment yellow LED with left dot Overflow +- 1 red LED Single digit 7 segment green LED with right hand decimal, https://docs.broadcom.com/docs/AV02-1589EN 2 Digit 7 segemnt red/green LED Single digit 7 segment orange common anode Single digit 7 segment high efficiency red One digit 7 segement super bright yellow LED with right hand decimal, https://docs.broadcom.com/docs/AV02-1589EN 2 Digit 7 segemnt blue LED, right hand decimal 10-Element Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Red Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Bar Graph Array https://docs.broadcom.com/docs/AV02-1798EN 10-Element Red Bar Graph Array 10-Element Red Bar Graph Array LCD 16x2 Alphanumeric 16pin 16 x 2 Character LCD LCD LM16255 16x2 character http://www.datasheetlib.com/datasheet/259542/lm16255_sharp-electronics.html 7-Segment Display, LTS67x0, http://optoelectronics.liteon.com/upload/download/DS30-2001-355/S6760jd.pdf 7Segment LED LTS6760 LTS6780 Single Digit 7-segment RGB LED NeoPixel addressable Kingbright, dual LED, 3.5 x 2.8 mm Surface Mount Single Row 2.54mm (0.1 inch) Pitch PCB Connector, M20-89007xx, 7 Pins (http://www.farnell.com/datasheets/2157639.pdf), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 20 Pin (http://ww1.microchip.com/downloads/en/PackagingSpec/00000049BQ.pdf#page=274), generated with kicad-footprint-generator ipc_noLead_generator.py QFN, 44 Pin (JEDEC MO-241/VAB, https://assets.nexperia.com/documents/package-information/SOT763-1.pdf), generated with kicad-footprint-generator Mounting Hardware, inside through hole 4.5mm, height 8, Wuerth electronics 9774050482 (https://katalog.we-online.de/em/datasheet/9774050482.pdf), generated with kicad-footprint-generator connector TE 826576 vertical TE, 1-826576-5, 15 Pins (https://www.molex.com/pdm_docs/sd/026604020_sd.pdf), generated with kicad-footprint-generator Soldered wire connection with feed.

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