I´ll give the pinball a little break for a smaller project: The Raspboy
A Raspberry Pi and a 3,5″ LCD in a Gameboy-Case.Portable. With working original buttons.
Well, the Raspi needs 5V (USB), the LCD 12V – a little problem.
The LCD: I bought a cheap, chinese LCD (30 Euro) – a rear-view-monitor for cars.
Back to the voltage-problem:
I found outt, that the LCD can be powered with 5V too, but unfortunately the instructions I found are for another PCB – I think the 8-legged IC on the left should be removed, but it has no printing on it so I´m not sure.
After some research I finally found out, that on the backside of the PCB a 5V connection is pissible. After removing the PCB from the LCD (This pad sticked very the PCB VERY good on the LCD) I found the solder bump labeled with “5V”:
Horray, it works!!
The attempt to power the whole thing with the 5V Battery (An external Batterypack for Smartphones) failed – after pressing the battery´s On-Button multiple times the Raspy and LCD worked.
I´ll use a Teensy for the controls – my first try of programming a microcontroller. The Teensy should arrive in the next few days.
I hope I solved the starting issue until then…
Problem solved: I simply removed the DC/DC Converter (the non-labeled IC) and now everything works fine!