Hello.
We have been dreaming of a custom made screen for PFM3.
There is always issues with the chineese versions. They come in different shapes. Some have completely wrong PCB layout for the SD card. Some have a different PCB diemensions. Some dont work at all due to bad quality or broken screen.
So me as a Preen builder have always struggled witht screens. You never know whats in the box.
Took some time, but finally I found time to make my own pcb for the screen.
Some notes on the process.
* MicroSD card instead of SD.
* no touchscreen pins
* 1.6mm pcb thickness.
* 3.3V for the screen and SD card. Chineese screens are using lower voltages for some reason.
* voltage regulator in bigger package for better heat dissipation. Pcb layout adjusted to support it.
* 3 Separate voltage rails and filtering groups for microSD card, screen logic and screen background light. This will take care of the wandering pulses in power rails.
The screens will be prebuilt in PCB fab except the glassbody, this has to be hand soldered.
We will test all the screens before shipping.
https://vandaal-electronics.com/wp-content/uploads/2020/11/20230509_091927-scaled.jpghttps://vandaal-electronics.com/wp-content/uploads/2020/11/20230509_091920.jpg
