weird SPI issue & pickit 3

Discussion in 'General Electronics Chat' started by gdallas, Dec 10, 2014.

  1. gdallas

    Thread Starter Member

    Apr 25, 2012
    I have two screens (both on the same SPI bus) both work properly except screen two will only power up when the pickit3 programmer is physically attached to the board. Once lit up, the programmer can be removed and the screen stays lit, but if you power cycle the board, screen 2 will not light up again, only screen 1. I suspected it was an issue with the chip select for screen 2 so I looped screens 1s CS to screen two to display the same dat and it worked fine (without the programmer connected) which has brought me to the conclusion that the rest of the electronics for screen 2 are ok and working as expected.

    Any ideas why I might need the programmer attached?
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    Any ideas how we could hazard a guess without the schematic attached?