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How I Repaired a VON Woofer With No Bass

By Jestine Yong on June 6, 2026

A client brought in a VON woofer with “No Bass” symptoms, I did initial tests to confirm what the customer said and indeed there was no Bass.

I opened the woofer and went straight to the bass circuit.

This woofer had a separate small board dedicated to the low-pass filter, this board is critical — if it fails, you lose bass completely

I did voltage testing around this and found 33V dc on one side of the resistor and less than 1 volt dc on the other side.

This is a red flag. A proper audio circuit should not have such a drastic voltage drop unless there is a faulty component or open path

I lifted one leg of the resistor and testing its resistance and found it very high. The resistor color code was red, purple, red (2700 ohms (2.7 kΩ).

Check Out The 2nd Edition Of Woofer Repair Course By Humphrey

I did not have the exact resistor in my kit and therefore I used two resistors in series (2400 ohms and 300 ohms)

After replacing the resistor, I re-tested the voltage and found the 1 volt has increased to 12 volts.

I connected the board back and tested the machine, to my surprise the woofer came back to life with deep, clean bass!

Key Lesson for Technicians

If you ever encounter: Woofer ON but no bass, Mid/high sound present and No distortion

Always check: Low-pass filter circuit, feeding resistors, Signal path continuity and Voltage drops across stages.

Humphrey Kimathi is from Nairobi Kenya and the author of:

1) Washing Machine Repair Made Simple

2) LED TV Panel Repair

3) Mobile Phone Repair Course

4) Lcd-Led Television Repair Guide

5) LCD-LED Television Repair Cases/Tips Volume 02

6) Microwave Oven Repair Made Easy

7) Basic Electronics Course

8) Home theater repair guide

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Note: You may check out his previous post on Pev Pro KV-80, 8-Channel Mixer Repaired After Catastrophic Failure!

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