Some LG models lost sound on chanels 73 and/or 90
may need software upgrade via USB
see following links:-
http://www.dtvforum.info/index.php?showtopic=89286
http://www.lg.com/au/support/faqs/support-faq.jsp
Aldi / Tevion 32" LCD TV
Symptoms: thin vertical line , sound OK
Cause: Faulty 2.5V 3 terminal regulator on Tcon board
Available from: element14 by free delivery - $0.75ea