I sort of had the same problems with a problem-child Kenwood I got off of Ebay, only ALL of my channels went out. This one is an Excelon MP3 player, so one would think Kenwood would have taken the time to put the little things in it, like, heat sink grease. NONE AT ALL!! My amp chip is fried in it, and pretty hard to come by. Luckily, this doesnt affect the pre-amp outs on it, so I am just going to have to break down and run three amps instead of one. Ack....more weight :(
If all else fails and you cannot get the speakers to work, I would bench-test it with a set of rca cables and a home stereo to see if you still have pre-amp capabillity, that is, if you dont have an amp in your car already. And if you do end up getting all 4 channels to work again, and if you find there isnt any grease between the amp chip and the heatsink, for pete'* sake, put some in. Your chip will be happy that you did.
Welcome, downwardly mobile yuppies, to the dawn of the Age of Nefarious.
1993 SSEi - FrankenJinx - dead and gone.
1994 SSE (136K strong) - 180* t-stat,HD alternator, most unequipped SSE on the club, XM radio, Kenwood CD/MP3.
2006 Chevy Malibu Maxx LTZ - Custom 2.25" manifold-back exhaust w/FM-80. Probably the only Maxx with this system.