Audio level might be locked, or set is in Hotel mode. If you wish to get this mode released, you have to enter its service mode option. If you wish to get more details about how to enter, adjust and exit service mode, check the site linked here.
http://electronicshelponline.blogspot.com/
Pull up previous posts or type in the
brand name and
model number to of your set, to its search box, and press '
Enter' or
view it in
Mosaic / Timeslide option.
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