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Hello, Yes the UE22 error on the Pioneer receiver is a failure of it's DSP chip which requires the chip to be re-waved onto the board. As far as the sound not coming from the DTV box through your TV speakers- are the TV speakers turned on in the MENU? Also how is the DTV box connected to the TV- simply using an HDMI cable?
If the TV speakers are turned on (postback with the model number off the back of the TV if you need instructions for that), and the audio of the DTV box runs directly to the TV- using either a sngle HDMI cbale or 5 component cables, then try rebooting the box.
Pull it's power cord for 10 seconds then plug it back in. Once it reboots check and see if there is sound from the TV speakers at this point.
Let me know what happens.
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Do you need further assistance with this?