Hi, since both remotes suddenly fail, I am assuming the problem is more than likely with the received rather than the remotes.
If you do wish to check your remotes, then point your mobile phone camera at the remote's Infrared lens and press one the remote's buttons. Your mobile phone camera is able to detect Infrared light and in case you remotes are working properly, you should see light coming out of your remote's Infrared lens.
Make sure that no direct sun light is on your receiver because that can effectively block out the signals from your remote controls.
Try the following method to reset your receiver. Unplug your receiver mains cable from the mains wall socket; power your receiver on by pushing the on/off button (nothing will happen obviously) and leave it like that for say 30 minutes. By that time all capacitors in your receiver will have discharged. Plug your received mains cable in the mains wall socket.Push the receiver's on/off button and see if it know responds to your remote controls.
If the problem still persists, you may have a failed Infrared receiver LED. That component can be found inside your receiver. It will take some basic elelectronics skills to get this component replaced. A service manual can help you. You can download it for free from this website:
http://elektrotanya.com/pioneer_vsx-32_33.pdf/download.htmlGood luck.
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