Repairing The Audio Amplifier Repair Guide

Difficulty

Moderate

Steps

Time Required

                          1 hour

Sections

Repairing the audio amplifier
14 steps

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Introduction

What you need

Step 1

              Repairing the audio amplifier

Here is the Amp in all its miniature glory. total size is 91/2 inches X 9 5/8inches and 6 inches deep. All controls are in the front panel.
Remove the 4 Phillips head screws from the back panel.
Here are the 4 #6x1" screws

Here is the Amp in all its miniature glory. total size is 91/2 inches X 9 5/8inches and 6 inches deep. All controls are in the front panel.

Remove the 4 Phillips head screws from the back panel.

Here are the 4 #6x1" screws

1024

Step 2

Remove the back panel. Use a small screwdriver, or other instrument to free it from its recess.
Work your way all around, since the back is a bit snug in the recess.

Remove the back panel. Use a small screwdriver, or other instrument to free it from its recess.

Work your way all around, since the back is a bit snug in the recess.

Step 3

Once the panel is freed from the recess, fold it down and remove from amp.
Something does not look quite right :-)
the transformer should be mounted to the PCB, not laying inside the box.

Once the panel is freed from the recess, fold it down and remove from amp.

Something does not look quite right :-)

the transformer should be mounted to the PCB, not laying inside the box.

Step 4

Trying to find a mount for it.
Closer view of the control panel PCB.
Mount for the transformer
Unoccupied connector
Fuse
Before anything else, check the fuse for continuity. this one has failed.

Trying to find a mount for it.

Closer view of the control panel PCB.

Mount for the transformer

Unoccupied connector

Fuse

Before anything else, check the fuse for continuity. this one has failed.

Step 5

Replace the fuse. Insert transformer power cable to PCB.
Since the Amp did not turn on, check the power out on the transformer. It does show 12V DC. Reconnect it and turn the Amp face forward.
The Amp uses a 6.3mm input and output jack. Apply a sound source to the input. Still no sound from the Amp, it is time to check a bit deeper.

Replace the fuse. Insert transformer power cable to PCB.

Since the Amp did not turn on, check the power out on the transformer. It does show 12V DC. Reconnect it and turn the Amp face forward.

The Amp uses a 6.3mm input and output jack. Apply a sound source to the input. Still no sound from the Amp, it is time to check a bit deeper.

Step 6

Remove the two Philips head screws from the carrying handle.
Those are 3mm x40mm
Remove the Philips screw on the right side of the Amp

Remove the two Philips head screws from the carrying handle.

Those are 3mm x40mm

Remove the Philips screw on the right side of the Amp

Step 7

Remove the Philips head screw on the left side of the Amp.
Unplug the speaker wires.
Remove the Philips head screw that holds the power cable bracket.

Remove the Philips head screw on the left side of the Amp.

Unplug the speaker wires.

Remove the Philips head screw that holds the power cable bracket.

Step 8

Remove the front panel and the attached speaker.
Simply lift it at an angle out of the back of the Amp.
The control panel and the attached PCB can now be removed.

Remove the front panel and the attached speaker.

Simply lift it at an angle out of the back of the Amp.

The control panel and the attached PCB can now be removed.

Step 9

Another odd looking piece is the location of the power Amp IC.
The smudge marks of the thermal past revealed that the board was loose and the the IC did not make contact with the heatsink
The thread in the heatsink was partially stripped. Use a small jewelers screwdriver to wedge under the screw,while using a #2 Philips screwdriver to remove it.

Another odd looking piece is the location of the power Amp IC.

The smudge marks of the thermal past revealed that the board was loose and the the IC did not make contact with the heatsink

The thread in the heatsink was partially stripped. Use a small jewelers screwdriver to wedge under the screw,while using a #2 Philips screwdriver to remove it.

Step 10

Remove the connector from the PCB.
Remove the IC PCB from the panel. The IC definitely shows some damage, most likely from overheating.
Here is a close up of the damaged IC. It is a TDA2030A 18 W hi-fi amplier / 35 W audio driver

Remove the connector from the PCB.

Remove the IC PCB from the panel. The IC definitely shows some damage, most likely from overheating.

Here is a close up of the damaged IC. It is a TDA2030A 18 W hi-fi amplier / 35 W audio driver

Step 11

These are the tools needed to replace the IC. 15W Soldering iron, flux and desoldering wick.
These are the five contacts that need to be desoldered. Apply some flux on the wick and heat up the solder with the soldering iron.
Remove the damaged IC

These are the tools needed to replace the IC. 15W Soldering iron, flux and desoldering wick.

These are the five contacts that need to be desoldered. Apply some flux on the wick and heat up the solder with the soldering iron.

Remove the damaged IC

Step 12

Insert wisdom here.

Insert wisdom here.

Step 13

Here is the replacement IC.
Place the IC properly on the PCB
Solder it in place.

Here is the replacement IC.

Place the IC properly on the PCB

Solder it in place.

Step 14

Reapply a thin coat of thermal paste to the back of the IC. Use a self tapping screw to attach it to the heatsink.
Now is also a good time to properly mount the transformer. I used some M3x15mm machine screws.
With those repairs made, all that is left is to reassemble the AMP. In my case, this Amp worked after replacing the TDA2030A

Reapply a thin coat of thermal paste to the back of the IC. Use a self tapping screw to attach it to the heatsink.

Now is also a good time to properly mount the transformer. I used some M3x15mm machine screws.

With those repairs made, all that is left is to reassemble the AMP. In my case, this Amp worked after replacing the TDA2030A

To reassemble your device, follow these instructions in reverse order.

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                    oldturkey03

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Matt Martin - Jan 15, 2019

Good Job! Very detailed, narratives good, and photos were excellent for a learning tool. Matt of Martins TV Repair.

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