By The Crusher - Mon May 28, 2012 12:21 pm
It seems like the missing component might have come loose from applying too much heat to the pins if you soldered them to the proto board shown. When soldering these kinds of board with smd components you need to be very careful not to apply too much heat, or some components might come loose. It looks like the component is still there you might be able to solder it back on, but you need to be very careful.
I have not tested it myself but you should be able to get the APC802 module working with a APC220 module. You just need to make sure they have a matching configuration.