Question about Labtec APX 4620 Computer Speakers
Open the unit and look forr the fuse to the unit. If power comes to the sub woofer drive board , check for the rail voltage to the IC.
Check the resistance of the subwoofer, make sure it i working.
If supply is coming to board, check for any signs of crack on the PCB. If not check for any loose connection on the IC.
If posible use a good soldering iron to solder suspected points in the board and the IC pins.
Since your set was working we must use the logic to look for a fault that occured during the transit.
if all the tests prove corrrect, then we can suspect the IC.
Make sure that there is input audio signals to the IC before you can confirm.
Posted on Aug 29, 2010
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Posted on Jan 02, 2017
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