What voltage and current does that power supply label show?

Was it a Xantech supply? (If it was, it was broken, as they have nothing that will output more than 12V unless faulty.)

The earlier literature stated that unregulated 12 volt supplies, which usually output about 17 volts, can lock up Xantech receivers. I'm not surprised that more than 20 volts killed some of them. I see their site has removed notes about requiring an exact 12 volts. People will still install unregulated supplies as a money-saver!

I suggest you download, and keep in that huge directory on your computer named "Tech Info," from [Link: xantech.com], under Quick Links:
2. Technical Training
5. IR Troubleshooting guide
6. IR Receiver Guide

The last two are probably in the first one. The "Installation Guide" is misnamed as it has to do with specific computer-programmed equipment.