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Repairing the audio amplifier

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  1. Repairing the audio amplifier, Repairing the audio amplifier: étape 1, image 1 de 3 Repairing the audio amplifier, Repairing the audio amplifier: étape 1, image 2 de 3 Repairing the audio amplifier, Repairing the audio amplifier: étape 1, image 3 de 3
    • 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

  2. Repairing the audio amplifier: étape 2, image 1 de 3 Repairing the audio amplifier: étape 2, image 2 de 3 Repairing the audio amplifier: étape 2, image 3 de 3
    • 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.

  3. Repairing the audio amplifier: étape 3, image 1 de 3 Repairing the audio amplifier: étape 3, image 2 de 3 Repairing the audio amplifier: étape 3, image 3 de 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.

  4. Repairing the audio amplifier: étape 4, image 1 de 3 Repairing the audio amplifier: étape 4, image 2 de 3 Repairing the audio amplifier: étape 4, image 3 de 3
    • 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.

  5. Repairing the audio amplifier: étape 5, image 1 de 3 Repairing the audio amplifier: étape 5, image 2 de 3 Repairing the audio amplifier: étape 5, image 3 de 3
    • 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.

  6. Repairing the audio amplifier: étape 6, image 1 de 3 Repairing the audio amplifier: étape 6, image 2 de 3 Repairing the audio amplifier: étape 6, image 3 de 3
    • 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

  7. Repairing the audio amplifier: étape 7, image 1 de 3 Repairing the audio amplifier: étape 7, image 2 de 3 Repairing the audio amplifier: étape 7, image 3 de 3
    • 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.

  8. Repairing the audio amplifier: étape 8, image 1 de 3 Repairing the audio amplifier: étape 8, image 2 de 3 Repairing the audio amplifier: étape 8, image 3 de 3
    • 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.

  9. Repairing the audio amplifier: étape 9, image 1 de 3 Repairing the audio amplifier: étape 9, image 2 de 3 Repairing the audio amplifier: étape 9, image 3 de 3
    • 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.

  10. Repairing the audio amplifier: étape 10, image 1 de 3 Repairing the audio amplifier: étape 10, image 2 de 3 Repairing the audio amplifier: étape 10, image 3 de 3
    • 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

  11. Repairing the audio amplifier: étape 11, image 1 de 3 Repairing the audio amplifier: étape 11, image 2 de 3 Repairing the audio amplifier: étape 11, image 3 de 3
    • 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

  12. Repairing the audio amplifier: étape 12, image 1 de 3 Repairing the audio amplifier: étape 12, image 2 de 3 Repairing the audio amplifier: étape 12, image 3 de 3
    • Insert wisdom here.

  13. Repairing the audio amplifier: étape 13, image 1 de 3 Repairing the audio amplifier: étape 13, image 2 de 3 Repairing the audio amplifier: étape 13, image 3 de 3
    • Here is the replacement IC.

    • Place the IC properly on the PCB

    • Solder it in place.

  14. Repairing the audio amplifier: étape 14, image 1 de 2 Repairing the audio amplifier: étape 14, image 2 de 2
    • 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

    I have an amp that I’m trying to repair but I cannot find the part that is calling for please help me

    Marlene Canady - Réponse

Conclusion

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

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oldturkey03

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

Matt Martin - Réponse

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