It is the Class D power amplifier module that JBL uses a lot in the powered sub-woofer, they are very unreliable and hard or impossible to get.
I had modified them to use linear power amp IC instead.
http://s807.photobucket.com/albums/yy352/budm/JBL%20PB-12%20mod/
Here is the service manual: http://fastservicemanuals.com/index.php?...
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