Dears,
Please give me a hand with my TC-1: I replaced U4 with a circuit composed of a veroboard and 2N3906, 2N3904, 3K3, 24K, 1N4148 (the small parts that I had at hand) plus enameled wire. Then I soldered a reversed SPI and flashed an 1.44m, make'd following the Clones file. Note: for the ST7735 I disabled the SPI_hardware (as I've read the pin assignment of this doesn't allow that), and added the spi bitbang configuration which was not on that section of the config_644.h. My flash size was 99.7% of the max.
At rest, it draws 4uA (as expected), and U4_P1 is Vbatt (3.8V), the rest 0V. If I short-press the button, the screen goes white for a second, then goes totally black with the backlight still on, drawing around 200mA, the button no longer responds and I have to remove the battery to power it off. If I long-press the button, the screen remains white for two or three seconds and then the same. When on, I measure close to 5V on the U4 pads.
Has anybody had similar difficulties?
BTW: Just in case, I'm following a schematic that sets P7(PD1) low when pressing the button, opposite to an old message in this thread during the early stages of support for this unit.