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When on turn on my LG 47" 3d tv sometimes I don't get any sound. Could you help me please.

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A few guesses: If you have any headphones plugged in to a connector, cycle it several times; push in and pull out. These connectors can lose contact inside over time.
2nd guess: Badly flowed solder in the area of the audio circuitry. Although most boards are now soldered by robots and some 'flow-soldering,' out of thousands of such solder points intermittent joints can still happen.
Unless you have some knowledge of what to look for to locate the audio circuitry and some insulated tools to probe with, it may come down to a board replacement and that will be expensive if the audio section is part of the main board what is quite likely.
Another possibility is a connector problem between the power supply board and the main board. You should pull the AC plug and allow the set to rest overnight to ensure that any hazardous voltages have a chance to discharge.
Remove the back panel of the set and locate a smaller board with larger parts visible on it; this should be the power supply. Look for plugs on the main (larger board, smaller parts) board and the power supply (this latter may be also visibly related to the incoming AC line). Carefully pull any plugs you see related to these two boards and re-plug them several times; this will 'wipe' any oxidation from the surfaces.
Reassemble and try it.

Posted on Aug 21, 2011

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