Question about Sony Str-k740p Radio Receiver

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Unlock how do i unlock sound on my receiver

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  • 79 Answers

I'd say check the user manual. You can download one from the sony site.

Posted on Apr 24, 2014

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Posted on Jan 02, 2017

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1 Answer

I get an unlock display when I change to vid2 input. How can I unlock the input? Thanks


I had this exact issue.
I was using the digital 2 input for sound. (Toslink cable from my cpu).

It seems I inadvertantly muted the sound on the pc, and this caused the "unlock" message with the L-R speakers flashing on the display.

I restarted my pc; and then unmuted the sound.
3 seconds later; the L-R stopped flashing and I now have sound on Vid2.

Jan 04, 2011 | Harman Kardon AVR 635 Receiver

1 Answer

No sound in hdmi mode unlock flashes on display I get sound in cd


Its asking your permission to unlock the setup menu. When you hit setup, and it says "unlock," you have to hit one of the navigation arrows on the remote control. Once you have unlocked the menu, you can assign the audio to that HDMI input.

Jul 30, 2009 | Harman Kardon AVR 130 Receiver

3 Answers

Harmon kardon 745 displays "unlock" no sound for tv or movies


I also had this UNLOCK message on my Harman Cardon AVR 130.
The reason for this error was - in a hurry I've plugged the optical input into optical OUT! Double check that your connections in the back are correct and hopefully it fixes your problem.

Cheers,
Sergey

Jan 11, 2009 | Harman Kardon AVR 130 Receiver

1 Answer

Can't unlock the DVD function on the receiver so get no sound.


You need a coax wire from DVD coax to Receiver Coax input. Don't put the red and white wire from DVD to Receiver because you don't need it. Thats what the coax wire those.
try and see if that works.

Jan 11, 2009 | Sony STR-DE597 Receiver

1 Answer

Receiving "Unlock" message and "Not Used" on my reciever


The HDMI inputs are pass through inputs only. The reciever cannot recieve any sound signals through the HDMI's. The reciever acts as a selector switch for the HDMI inputs. Whatever input you have selected on the reciever is the one that is being sent through the output to your TV. The "unlock" display shows when there is no sound signal sent to the reciever. There is no code to unlock. This is the reciever's way of telling you that there is no sound being sent to it from that input. Since there is no sound being processed from the HDMI's, you need to hook up an additional audio cable from the device to the reciever (preferrably an optical cable). When the reciever recieves an audio signal, it will then "unlock" and you will get sound. The only purpose for the HDMI jacks on this reciever is to give you a bonus HDMI jack so you only have to use one on your TV. I know it is confusing. I had to look into this problem myself, so I'm happy to help. Higher end recievers will actually recieve and process sound signals from the HDMI's.

Dec 30, 2008 | Sony STR-DG520 Receiver

1 Answer

We are unable to have sound for the DVD player and game systems


The receiver is looking for a specific "audio input" It's currently locked on analog or digital. Using the Sony remote, go into the main menu for the receiver, toggle to audio and select "auto" that should do the trick. Hope this helps

Dec 29, 2008 | Sony STR-DE445 Receiver

1 Answer

Have unlock problem on str-da1200es receiver


Sounds simple, but could the input mode button been pressed accidentally? Try setting this to auto and see if the unlock message switches off. This happened to me! :-)

Jul 26, 2008 | Sony Audio Players & Recorders

1 Answer

The word unlock is displayed on the amp


http://www.kb.sony.com/selfservice/microsites/search.do?cmd=displayKC&externalId=C216020&sliceId=1&sonymodel=STRDG710&sonyregion=US&sonytemplate=1&product=SG_STRDG710_5_8023&fes=true

Nov 19, 2007 | Sony STR-DE675 Receiver

1 Answer

Sony receiver optical sound "unlock" str-de898


Just fixed it, The Optical cable wasnt properly plugged in on the other end.

Found the fix here:
http://esupport.sony.com/US/perl/model-home.pl?mdl=STRDE945&LOC=3

Oct 09, 2007 | Sony STR-DE898 Receiver

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