Ruining a 2600 console chips

[Frotz]

I think I might have fried one or more chips in my 2600 sixer while trying to get the Longhorn mod working. After futzing around with where the power is going, I noticed that the voltage regulator was outputting around 1 volt and the 2200uF capacitor on the switchboard was shorted. I had fresh spares of those onhand, so went in and replaced them. I popped out the chips, which I probably should have done earlier. After some more poking and checking for solder bridges and so on, I concluded that power was getting where it needed to go. I attatched the mod only to pins 11 and 12 on the TIA (the audio outputs). My thinking was that I pop in "Empire Strikes Back" and I'd have instant feedback as to whether things are working or not. Now that the power distribution is good, I can't get the TIA to output any audio. I haven't yet checked video.

 

Based on the absense of audio output at this stage, can I conclude that one or more chips in this console were fried? Aside from getting another console to mess with, how can I be sure just what went wrong?

[+GroovyBee]

If you have a logic probe check that the CPU comes out of reset and there is activity on the address and data bus with a cart plugged in.