Hello to everyone
, I'm searching for some help with my tester...
I have what I think is a "standard" GM328 AY-AT chinese clone kit (writngs on the pcb: K103603BS 2578AY-AT) with 160x128 color display, it came with 1.12 k firmware and appears to work correctly. I want to modify the hardware to improve the accuracy as explained here:
https://github.com/blurpy/transistor-tester (this is why I searched exactly this model) but before to order the parts I wanted to be sure I can upgrade the firmware and there started my problem:
I downloaded the current 1.51 m firmware and configured the makefile, config.h and config_328.h according to the included Clones file. Compilation gives no errors and I write the firmware to a spare ATMEGA328P microcontroller.
With the new firmware the tester turns on and the screen gets cleared correctly but it stops there, the display remains black, nothing appears on it (the backlight is of course on).
I can say the display is cleared correctly because if I change the display size or rotation in config_328.h I can make it to initialize partially while the remainder of the screen shows random color pixels.
When I press the rotary controller, the led responds by turning momentairly off, but I tried to connect my multimeter to the test leads and playing around (also if without seeing) with the rotary encoder, and do not see any voltage activity, so I think it's not just a problem of display/color settings, it seems to me the tester is stuck at some point of the initialization and does not respond.
I also tried to write the "mega328_color_kit.hex" prebuilt firmware available here:
https://github.com/kubi48/TransistorTester-source/tree/master/trunk/mega328_color_kit but it displays a blanc (white) screen and nothing more. I tried also the "OrigChina.hex" in the same folder but also that displays the blanc screen.
Also searching for "black screen/display" in this thread did not produce useful answers and this looks strange to me because my model seems pretty common and documented. Anyone has suggestions?