5.1 SUBWOOFER Section not working | Amplifier live checking fault finding

How to start checking an amplifer to locate the fault easily.

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TOOLS I USE
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JBL 12 inch 1500 watts subwoofer - https://amazon.openinapp.co/b07qz41dkx
2.1 amplifier board full kit - https://amazon.openinapp.co/b09rt83jct
Subwoofer filter board - https://amazon.openinapp.co/b07wkjr1mn

Soldering Iron:
SOLDRON 25 Watt Soldering Iron : https://amazon.openinapp.co/soldron-s...

Soldering Lead: 30 g Tin Lead Rosin Core Soldering Iron Wire Reel :
https://amazon.openinapp.co/gobageec2...

Wire Cutter: 6-inch Wire Cutter or Stripper https://amazon.openinapp.co/visko-too...

Digital multimeter: https://amazon.openinapp.co/dt830d-di...

Analog multimeter: https://amazon.openinapp.co/rytee-sal...

Screw Driver : https://amazon.openinapp.co/vadda-bai...

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