See where the red one goes to a pad labeled B+? There should be another pad labeled B- or GND. Failing to find that, look for where there appears to be an empty pad with the broken stub of wire on it.
Also try looking in the Dead Players board, someone else has a G-18A there and might be able to provide more detail.
The firmware is this (seems to be an exact match):
http://www.s1fw.com/Firmware-1/G-18A...-IPODM-fw.html