Alex’s multimeter showed 5V at U6 pin 4, but 0V at pin 5. Aha! U6 was dead. Replacing that $3 chip brought charging back to life. The schematic showed each analog stick as a pair of potentiometers (X and Y axis). For the left stick, J1 pins 1, 2 (X) and 3, 4 (Y). Alex followed the lines: stick pins went to resistors ( R10 , R11 ) then straight to the main chip U1 (the custom Sony microcontroller).
Alex had two choices: buy a new controller, or learn to read the . What is JDM-055? JDM-055 is the model number of a specific revision of the PlayStation 4 controller’s main circuit board. Sony made many revisions (JDM-001, 011, 030, 040, 050, 055). The 055 revision appeared around 2016–2017. It looks similar to the JDM-050 but has subtle differences: different charging IC, different analog stick pinout, and a smaller Bluetooth module. Jdm 055 Schematic
The schematic wasn’t just a diagram—it was a detective’s notebook, a treasure map, and a repair superpower. Alex’s multimeter showed 5V at U6 pin 4, but 0V at pin 5