I presume that your amplifier is not working after the impedance was changed. If the speaker connections had shorted while this was changed with the power ON then it is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.
My high-level $.02...
Consider the TV's role in all of this and it may nake things easier.
A TV's speakers are NOT generally considered a viable additions or alternatives to audio-specific designs. That is not to say they aren't better than some. Just that same TV's usually are not at the output end of an audio chain for good reason. Video, yes.
Even though this may go 'against the book', I'd recommend you go for minimal receiver involvement in the video side other than to send composite video to the TV from "Monitor Out" so you can set up and manage the receiver through the TV.
You can also send Cable- or Sat Box basic analog audio directly to the TV if it has inputs for audio. That way if you just want to watch the news or weather you don't need to fire up the Receiver.
Your video sources (DVD, BD, Cable/Sat) can suffer fewer video anomalies and unnecessary modifications or conversions if you send their BEST video directly to the TV and their BEST audio directly to the receiver. That way everything is handled only once by the best electronics you have for each function.
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