I recently had an opportunity to break open one of my 900 MHz EFJ radios. It had developed a problem on transmit with the audio, and as part of normal troubleshooting, I wanted to remove the housing and re-seat some of the flex connectors inside. Luckily, I was able to resolve the audio with this procedure. While inside, I snapped a few pictures to show.
If you look at the second picture in the first row, I have the screwdriver underneath a flex cable. This is where signals from the PTT and other buttons travels from the UI (user interface) board to the rest of the radio. This board is then interfaced to logic board (small board at the bottom in the frame). The logic board is connected to the pretty blue RF board via flex as well. Hopefully no one has to go inside of their radio anytime soon!
