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Treblab HD77 Motherboard Replacement

Introduction

In this guide you will learn how to replace the motherboard in your Treblab HD77. The motherboard is the control center that connects all of the electrical components of your speaker. Any issues that regard charging, Bluetooth connection, sound quality, the LEDs or anything else of that nature, could be a direct result of an issue with the motherboard. Even if every component of the speaker is in perfect condition and works fine, a faulty motherboard can cause those components to function improperly or stop them from functioning all together. For this reason the motherboard is a necessity to the functionality of any electronic device and this guide aims to help in replacing the motherboard for the Treblab HD77.

Note that this speaker is water resistant and as a result uses a water resistant adhesive in some areas which will have to be removed in certain areas in order to access the motherboard. To restore its water resistance, this adhesive will need to be manually reapplied before reassembling the speaker.

What you need

  1. Treblab HD77 Motherboard Replacement, Surround: step 1, image 1 of 3 Treblab HD77 Motherboard Replacement, Surround: step 1, image 2 of 3 Treblab HD77 Motherboard Replacement, Surround: step 1, image 3 of 3

    • Remove the outer casing of the speaker by prying at the edges to unlock each prong holding the casing to the speaker.

    Edit

  2. Treblab HD77 Motherboard Replacement: step 2, image 1 of 3 Treblab HD77 Motherboard Replacement: step 2, image 2 of 3 Treblab HD77 Motherboard Replacement: step 2, image 3 of 3

    • Remove the plastic ring on top of the rubber surround on the side of the speaker by lifting it gently.

    • There is a layer of adhesive between the plastic ring and the rubber surround beneath it.

    Edit

  3. Treblab HD77 Motherboard Replacement: step 3, image 1 of 3 Treblab HD77 Motherboard Replacement: step 3, image 2 of 3 Treblab HD77 Motherboard Replacement: step 3, image 3 of 3

    • Insert the blade of a small precision knife between the edge of the rubber surround and the plastic edge.

    • Gently apply pressure and slide the blade in a circle along the entire circumference until the surround loosens and can be removed.

    • There is a layer of adhesive between the surround and the plastic housing it is resting on.

    Edit

  4. Treblab HD77 Motherboard Replacement, LED Light: step 4, image 1 of 3 Treblab HD77 Motherboard Replacement, LED Light: step 4, image 2 of 3 Treblab HD77 Motherboard Replacement, LED Light: step 4, image 3 of 3

    • Slide a small precision knife underneath the LED light strip and remove the adhesive holding it in place.

    • There are four points where adhesive is used to hold the LED light strip down.

    • Lift up the LED light strip from the plastic casing.

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  5. Treblab HD77 Motherboard Replacement: step 5, image 1 of 3 Treblab HD77 Motherboard Replacement: step 5, image 2 of 3 Treblab HD77 Motherboard Replacement: step 5, image 3 of 3

    • Flip the LED light strip upside down to see where the cord is plugged in.

    • Gently pinch the wire with your pointer finger and thumb, and remove the cord from the LED slowly.

    • The cord is very thin and lightweight so use caution when handling.

    Edit

  6. Treblab HD77 Motherboard Replacement, Motherboard: step 6, image 1 of 3 Treblab HD77 Motherboard Replacement, Motherboard: step 6, image 2 of 3 Treblab HD77 Motherboard Replacement, Motherboard: step 6, image 3 of 3

    • Using a Phillips #0 screwdriver, remove all four 10mm screws that were exposed by removing the LED light strip.

    • Lift the plastic ring once all the screws have been removed.

    • The screws are very tiny and can fall inside the device if they are not handled carefully.

    • Repeat steps 1-6 for the opposite side.

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  7. Treblab HD77 Motherboard Replacement: step 7, image 1 of 2 Treblab HD77 Motherboard Replacement: step 7, image 2 of 2

    • Slide the inner electronics casing out from the outer tubing encasing it.

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  9. Treblab HD77 Motherboard Replacement: step 8, image 1 of 2 Treblab HD77 Motherboard Replacement: step 8, image 2 of 2

    • Unscrew the six 10mm screws holding the two halves of the electronics casing together using a Phillips #0 screwdriver.

    Edit

  10. Treblab HD77 Motherboard Replacement: step 9, image 1 of 3 Treblab HD77 Motherboard Replacement: step 9, image 2 of 3 Treblab HD77 Motherboard Replacement: step 9, image 3 of 3

    • Insert the blade of an Xacto knife in between the edge of the rubber button cover and the extruded edges holding it in place.

    • Gently trace around the edge until you feel the cover beginning to loosen, and then slowly peel the cover up.

    • Be careful to not apply too much pressure with the blade, as there is a circuit board directly underneath the cover. There is also a layer of strong adhesive between the circuit board and the cover.

    Edit

  11. Treblab HD77 Motherboard Replacement: step 10, image 1 of 2 Treblab HD77 Motherboard Replacement: step 10, image 2 of 2

    • Using a Phillips #0 screwdriver, unscrew the six 5mm screws holding the circuit board in place.

    Edit

  12. Treblab HD77 Motherboard Replacement: step 11, image 1 of 2 Treblab HD77 Motherboard Replacement: step 11, image 2 of 2

    • Turn the speaker over to the side with the charging port dock, and gently pull the two halves apart by firmly grasping each half until they separate.

    Edit

  13. Treblab HD77 Motherboard Replacement: step 12, image 1 of 3 Treblab HD77 Motherboard Replacement: step 12, image 2 of 3 Treblab HD77 Motherboard Replacement: step 12, image 3 of 3

    • Pinch the wire connecting the circuit board to the motherboard between your thumb and pointer finger, and gently remove the wire from the circuit board.

    • The cord is very thin and lightweight so use caution when handling.

    Edit

  14. Treblab HD77 Motherboard Replacement: step 13, image 1 of 3 Treblab HD77 Motherboard Replacement: step 13, image 2 of 3 Treblab HD77 Motherboard Replacement: step 13, image 3 of 3

    • Orient the speaker so the motherboard is on the bottom half, facing up, and the circuit board cutout is facing you.

    • Using your thumb and pointer finger grip the plug connected to the large red and black wires at the top just below the extruded lip, and gently lift until the plug comes out.

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  15. Treblab HD77 Motherboard Replacement: step 14, image 1 of 3 Treblab HD77 Motherboard Replacement: step 14, image 2 of 3 Treblab HD77 Motherboard Replacement: step 14, image 3 of 3

    • Using your thumb and pointer finger grip the plug connected to the small red and black wires at the top just below the extruded lip, and gently lift until the plug comes out.

    Edit

  16. Treblab HD77 Motherboard Replacement: step 15, image 1 of 3 Treblab HD77 Motherboard Replacement: step 15, image 2 of 3 Treblab HD77 Motherboard Replacement: step 15, image 3 of 3

    • Take each half of the speaker and unscrew the four, 5mm screws that hold in each diaphragm, using a Phillips #0 screwdriver.

    • Only remove the diaphragm on the side with the motherboard.

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  17. Treblab HD77 Motherboard Replacement: step 16, image 1 of 2 Treblab HD77 Motherboard Replacement: step 16, image 2 of 2

    • Using a Phillips #0 screwdriver, unscrew all six 5mm screws on the motherboard.

    Edit

  18. Treblab HD77 Motherboard Replacement: step 17, image 1 of 2 Treblab HD77 Motherboard Replacement: step 17, image 2 of 2

    • After completing steps 10 and 11, the diaphragm and motherboard should both be loose and free to move.

    • Let the diaphragm hang out of the bottom from its hole and lift the motherboard out of its place.

    Edit

  19. Treblab HD77 Motherboard Replacement: step 18, image 1 of 3 Treblab HD77 Motherboard Replacement: step 18, image 2 of 3 Treblab HD77 Motherboard Replacement: step 18, image 3 of 3

    • Using your pointer finger and thumb, pinch the top of the plug for the diaphragm from the top just under the extruded lip, and gently lift it up until it unplugs.

    Edit

  20. Treblab HD77 Motherboard Replacement: step 19, image 1 of 1

    • Use a pair of flush cutters to cut the wire connecting the two diaphragms so the motherboard can be removed.

    • To reassemble, solder the new motherboard to the diaphragm wire.

    Edit
Conclusion

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

Author

with 4 other contributors

Hunter Figueiredo

Member since: 11/04/25

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Team

UMass Dartmouth, Team 3-5, Biswokarma Fall 2025 Member of UMass Dartmouth, Team 3-5, Biswokarma Fall 2025

UMASSD-BISWOKARMA-F25S3G5

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