Posted 20 February 2012 - 09:17 PM
The problem with trying to repair the factory deck is that the parts can be expensive (if you can even find them), and most of the components are soldered directly to the circuit board, so even if you could get the parts, you may not be able to install them.
I would recommend a new HU. It's worth it.
Get whatever you like that's within your price range; as you can see with some current discussions on the board, there's already plenty of disagreement as to what's good and what isn't. I'm a big fan of Kenwood and Pioneer's HUs. As for wiring, get the requisite harness, and solder that to the harness that comes with the deck. Other than the 12V power extension for the antenna amplifier, the rest of it is plug and play from there. (the soldering you can do from the comfort of your living room.)
As for which harness and/or dash kit you need, just go to crutchfield.com to get the part #s. Or eBay, they'll have them listed by vehicle. The kits for the matrix I think are Scosche and Metra.