User Guide

Troubleshooting General/ Video Flow - 13
Video Flow
Video signals begin on the logic board at connector J16 and travel
to connector J2 on the A/V interconnect board. The video signals
then travel out from connector J5 (on the opposite side of the A/V
interconnect board) and continue on via the internal RGB cable to
P301 on the analog/video board. From there, the signals are
transmitted to the CRT where they are displayed on the screen.
Click here
to see an animation of how the video signal travels
through the iMac.
Sound In Flow
Sound coming into the iMac system originates at the internal
microphone located in the top front area of the system, or through
an external microphone connected to the logic board.
If the sound signals originate at the internal microphone, they
travel along the long internal audio cable to connector J6 on the
A/V interconnect board. The signal is then transmitted to
connector J1 on the back side of the A/V interconnect board,
travels via the short internal audio cable, and finally arrives at
connector J14 on the logic board.
If the sound signals originate at an external microphone, they
travel directly from the external microphone to the microphone
(sound in) connector on the logic board.
Click here to see an animation of how the sound in signals travel
through the iMac.