Why don't any light come on the speacher or the subwoofer

• If there is NO POWER at all: You must trace the power flow from the source. Start at the AC Input Cable and move through the power supply stages:
  1. ​AC Input & Fuse: Check for continuity at the fuse.
  2. ​Bridge Rectifier: Ensure AC is being converted to DC.
  3. ​Standby Circuit: Look for the 5V Standby voltage. If this voltage is missing, the system will never boot or show any lights.

​If the unit functions (produces sound) but the LEDs are dark, you must perform a Reverse Trace (Back-tracing) from the point of failure:

1.  At the LED Pins: Measure the voltage at the pins supplying the lights.

2.  Back-trace the Rail: If there is 0V at the pins, trace the circuit backward to the LED Driver or the Controller IC.

3.  Check the Interconnects: Inspect the ribbon cables between the main logic board and the display panel.

4.  Find the Breaking Point: Continue tracing back until you find the point where voltage is present. The component just after that point is your culprit.