JVC XV-511 Audio OK with CD but none with DVD

Did you try the TH-A5 remote? http://www.ebay.com/itm/JVC-RM-STHA5J-DVD-AUDIO-REMOTE-AH59-00129A-for-JVC-TH-A5-TH-A5U-XV-THA5-/121567588149?pt=LH_DefaultDomain_0&hash=item1c4dfe2f35
Some functions may not work but may be OK.

This problem could be related to your DVD's audio settings.
1. Check that 3D Phonic is turned OFF.2. Navigate to the Preferences menu3. Select the Preferences 2 tab4. Select "DOWNMIX" and change it to L0/R0
Manual

Hi,

Good day. The message your getting only tells you that the Dvd your trying to play have a lot of scratches already that makes it unreadable for your dvd player. You can try to wipe the dvd first then try it again. If it doesn't work then that means the dvd unusable. Hope this information help a bit in resolving your question. Thanks for using fixya and have a great day

hi How do I unlock my JVC xv - THG41 dvd player

Connect the yellow connector on the DVD player to the yellow connector on the TV. Refer to the TV manual and select the video input. Refer to DVD manual and choose interlace on the DVD player. Let me know if this helps

jvc xv n332 audio ok but no video how to unlock

It's a software problem pls upgrade ur dvd player.ur problem will be solved

Here is the manual for JVC XV-S302 . 
http://www.fixya.com/support/p186882-jvc_xv_s302_dvd_player/manual-17083/page-3

Hope this might help.

Look at the Audio Menu on the DVD, it is possible with the remote control to push the MUTE button while going back.

Look at the MUTE button on the remote and push it again.

AL

ATTENTION Opening your player will void the warranty! Modification are at your own risk! No guarantee for function!
JVC XV-511
selfmade hack

1. Remove the top cover. 2. Locate wire jumper B532 o the printed circuit board nearby the front panel, it can be found just underneath the connector linking this board with the one above. 3. Cut bridge B532. 4. Apply power, PW (Password) appears on the display. 5. Enter the code 5963 with the remote controller, PW OK will be displayed. 6. Switch the set off and on ... and it will be zonefree !!!

Important information It seems that JVC received some complaints from the software industry that these players were much too easy to modify and they had to change the design to prevent further 'multi-zoning'! All sets with a serial number starting with 134xxxxx or 144xxxxx will normally need a new PROM to make them a real multizone machine! Don't despair if you have one of the newer types because there's a hidden multizone 'backdoor' ! Yes, the above mentioned modification will still work after you plug in the power cord, at this moment the set will play all zones as long as you don't switch it off with the standby button, once this happens it will be back to zone 2 and you'll need to unplug/plug in the power cord again to get it back to multizone. ATTENTION Opening your player will void the warranty! Modification are at your own risk! No guarantee for function!