Panasonic SB-WA840 Service Manual page 13

6.2.7. Replacement of Power IC and
Transistor
Follow Step (1) to Step (5) described in section 6.2.4.
Follow Step (1) to Step (3) described in section 6.2.5.
Step 1: Desolder the Power IC and Transistor terminal.
Step 2: Remove 2 screws and Power IC501.
Step 3: Remove the screw and Transistor holder.
Step 4: Detach the Power IC and Transistor from Heat sink.
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SB-WA840EE