I have an LG, LHB953 and I am having a similar problem. When I do the audio check of the unit, all speakers are functioning. When I play a DVD or watch Netflix, I get the front two speakers only. I purchased a diagnostic disc from CompUSA and it is showing that that only the front two speakers are connected properly and I get no test tones out of the other speakers. Right, left surround, center and sub-woofer give me nothing. When I connect the wires for these speaker to either the left or right front locations on the unit, the speakers give a tone. I re-connect all wires as the instructions say, the test mode shows all speakers functioning properly. But again, when I play on the front left and right operate. Help!