iFixit - Answers With Device "Car amplifier"

Car amplifier: One channel is not working

Sat, 14 Feb 2026 15:30:41 -0700

One channel is not working

⟐ Answered February 14, 2026 at 15:30 MST

Car amplifier: No sound in the speakers

Sat, 14 Feb 2026 15:24:09 -0700

The amp is not producing sound

⟐ Answered February 14, 2026 at 15:24 MST

Car amplifier: Why can see which channel is not working in a 4 chanel Targa amplifier

Mon, 15 Dec 2025 23:52:44 -0700

How can I identify a dead or burnt channel from my 4 way channel targa amplifier

⟐ Marked as duplicate December 15, 2025 at 23:52 MST

Car amplifier: Red protection light turns on

Fri, 22 Aug 2025 20:08:22 -0700

Everything is connected correct but when I turn my car on the red protection light goes on and there is no sound what could it be?

⟐ Answered August 22, 2025 at 20:08 MST

Car amplifier: Running 24volts on a 12volts car amplifier

Wed, 02 May 2018 05:44:15 -0700

My question is, is it going to damage my amplifier and what are the negative effects. Im using two 12 volts car battery. My amplifier is a audio planet PL2000.1M.

Thx in advance

⟐ Commented May 02, 2018 at 5:44 MST

Car amplifier: Fault Report – Car Amplifier (Class AB, MB-4100)

Fri, 20 Mar 2026 19:38:37 -0700

Fault Report – Car Amplifier (Class AB, MB-4100)

Symptoms:

Amplifier consumes approximately 630 mA quiescent current with no load connected.

All driver transistors in the output stage (for all 4 channels) are running hot.

All output transistors, diodes, ICs, and capacitors have already been checked and/or replaced.

Tests Performed:

1. Verified power supply rails are stable and within specification.

2. Checked biasing resistors and emitter resistors for drift or incorrect values.

3. Inspected PCB for possible leakage paths, solder bridges, or damaged traces.

4. Replaced electrolytic capacitors in both power supply and audio sections.

5. Output stage power transistors tested OK (no shorts or leakage).

Issue:

Despite the above, high idle current and overheating of the driver stage persists.

Request:

Looking for guidance on:

Possible causes of excessive idle current in the driver stage.

Recommended next steps for isolating whether the problem is related to bias circuit, thermal tracking, or feedback loop instability.

Please help me

⟐ Edited March 20, 2026 at 19:38 MST