You were helping me with my receiver(sony str-de605) last june and i have some other questions if you dont mind.

Question edited heavily for clarity.
Question moved from Office Equipment.

Here is your fix
https://us.community.sony.com/s/question/0D50B00004IL1K5SAL/how-to-handle-a-usb-fail-message-from-a-strkm3-that-has-no-usb-port?language=en_US

https://www.google.com/search?q=Sony+STR-KM2+error+USB+Fail

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You may view/download the manual at Owners Manual User Guide for Sony STR DE605 Receiver

try a reset on unit but unit may have a faulty pa stage

Sorry for a dump question ,
have you changed the distorted Right speakers to LEFT to verify if speaker is OK ?
First try with just STEREO ,not on Surround and please contact me for further solution possibility..
Take care..

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Sony-STR-DE985-Receivers-manual/id/387dj984/t/2/

Depending on your tv output, you shpuld be able to hook your TV to receiver via audio output. Running your video components through your receiver will not give you the best performance anyway. Run your HD DVR to TV the way you have it then, if it's possible to run audio out from TV, via, RCA, digital optical, etc., to your receiver. The sound will be transfered through the TV. You may also be able to utilize component out from your HD DVR and a separate audio cable.

Internal problem probably needs output transistors and a dual emmiter resistor (could a couple other parts too). Parts and labor should be about $100 to $125.

If protect is still there you need to follow you manual, and check your speakers. Protect is there so you dont blow out you speakers.

Do you have the manual ? if not try looking at this = http://www.fixya.com/support/p224504-sony_str_de605_receiver/manual-16189

there is no problem with the amplifier audio,check some resistors or disconections near the spkr terminals.