Lexus LS460 No sound Audio amplifier board cleaning

LEXUS LS460

I received this item due to the problem that the audio often cuts out.

When symptoms occur

TV, radio, navigation, CD, etc.

Regardless, all sounds cut off with a “buzz”

It gets better once by turning the engine on and off, but it keeps happening again.

Based on the symptoms, it seems that the audio amplifier is malfunctioning.

Remove the amplifier on the right side of the trunk and inspect it.

There is no problem with the power supply.

There doesn't seem to be any signs of injury or water leaks.

Let's break it down.

Inspect for dust, corrosion of the base, cracks in the solder, etc.

I did a simple continuity check and there seems to be no abnormality so far.

Let's break it down further.

If you look closely, you can see that brown stains are spreading.

This is called flux

A coating that prevents oxidation of the board during soldering .

Even if it was good at the time of manufacture.

It seeps onto the foundation due to age deterioration.

This may cause unnecessary conduction with other contacts.

This seems to be the core chip for audio output.

The flux is seeping and spreading.

The symptoms of audio interruption occurred regardless of whether the vehicle was driving or over a step.

This time, we speculated that abnormal conduction due to flux was the cause.

We do not replace the amplifier and do the cleaning work of the base ourselves.

We will clean it using a special solvent.

This is the base after cleaning.

The chip that was thought to be the affected area is now clean.

This time, the symptoms were improved by cleaning the audio amplifier's base.

These expensive parts that basically have no choice but to be replaced.

In some cases, the problem can be repaired by cleaning the base.

*We cannot guarantee that the malfunction will be corrected or that the product will work properly.