Before analyzing the circuit diagram, one must correctly identify the pins. The STK413-430 is an 18-pin device. The pins are usually numbered from left to right when viewing the IC from the front (the side with the printing).
If a channel fails, some advanced hobbyists "de-cap" the module to replace internal power transistors, though this is "surgery-level" work. Resources & Next Steps stk413-430 circuit diagram
The circuit diagram of the STK413-430 is relatively simple and straightforward. Here's a basic schematic: Before analyzing the circuit diagram, one must correctly
Left input ---||----- pin 9 (L in) 10µF Before analyzing the circuit diagram
: Uses resistors and capacitors to set the gain and stabilize the output.
): Split rail power pins to drive the high-power output stages.