Designing a PCBA is a complex process, and many steps are required before a PCBA is made.
Some key steps:
1) Define product functions
2) Design circuit schematics
3) Layout PCB
4) Make PCB
5) Soldering EE components on PCB
6) Test hardware functions on PCBA
7) Write firmware for PCBA if there is a MCU/DSP/CPU on the PCBA
8) PCBA product functions test
Some key steps:
1) Define product functions
2) Design circuit schematics
3) Layout PCB
4) Make PCB
5) Soldering EE components on PCB
6) Test hardware functions on PCBA
7) Write firmware for PCBA if there is a MCU/DSP/CPU on the PCBA
8) PCBA product functions test