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TOZO HT2 Daughterboard Replacement

Raven M and 4 other contributors

Last updated on Jan 2, 2025

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30 - 35 minutes

Moderate

Introduction

Go to step 1 ↓

When dealing with the daughterboard, similar to the motherboard, it can be a delicate repair that demands attention to and some soldering. Following the steps outlined in this guide, we will provide you with a comprehensive explanation on how to correctly swap out the daughterboard. Unlike its predecessor in the circuitry, this board is linked directly to the battery, which contains potentially harmful chemicals meaning it is extremely important to exercise caution in order to prevent damaging the battery. The daughterboard is located underneath the left ear pad, close to the headphones edge. When you do remove this part it is vital to use caution because damaging the connecting wires is easy if you are not paying enough attention.

Each of the screws for this project are the same 6.3mm Phillips head screws.

What you need

Tools

1. Step 1 Ear Pad
  Firmly hold the headphone housing in one hand to hold the device steady and put the other hand on the ear pad you intend to replace.
  
  Note: Do not force the ear pad to come off or you risk breaking the tabs that keep the pads in place.
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2. Step 2
  Twist the ear cover counterclockwise until it pops off.
  
  Repeat for the other ear pad if necessary.
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1. Step 3 Daughterboard
  Use a Phillips screwdriver to remove all four screws that secure the right speaker cover.
  
  Lift the cover off without pulling on the wires inside and set it to the side to access the circuit board.
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2. Step 4
  Unscrew the circuit board and gently pull it up from the plastic tab it sits on.
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4. Step 5
  Carefully use flush cutters, to cut the wires connecting to the circuit board and the battery.
  
  Be careful not to cut the wires too short. Ideally, as close to the circuit board and battery as possible removing minimal wire.
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5. Step 6
  Use this guide to reattach the wires to the circuit board.
  
  HANDLE WITH CARE: Soldering Iron becomes VERY Hot (Up to or above 400°C or 800°F).
  
  Wear eye protection while soldering and only do so in a well ventilated room and/or with a fume extractor.
  
  Remove all possible fire hazards from the surrounding area.
  
  Keep all animals and children out of the room.
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Conclusion

To reassemble your device, follow the above steps in reverse order.
Take your e-waste to an R2 or e-Stewards certified recycler.
Repair didn’t go as planned? Try some basic troubleshooting or ask our Answers community for help.

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