How to Disassemble a Sony ULT WEAR (WH-ULT900N) Headphone (Full Teardown and DIY Repair Tutorial)

Do your Sony WH-ULT900N wireless Bluetooth headphones have a dead or failing battery? Are the touch controls unresponsive or only working intermittently? Does the charging port only work when the cable is held at a specific angle? Are the earpads or headband cracked, torn, peeling, or worn out? If you're experiencing any of these issues, this DIY teardown guide will show you how to disassemble your Sony WH-ULT900N headphones and complete the necessary repairs at home.

Prefer to get your earbuds professionally fixed? Send us your Sony WH-ULT900N headphones using our mail-in repair service, and our repair ninjas will restore your device to peak working condition. You don’t need to pay upfront. We only charge you after your device has been successfully repaired.

Fill out our repair form to receive your free prepaid shipping label, then send your device. We’ll take care of the rest.

Repair Difficulty

Moderate / Requires 45-60 minutes to complete.

This repair involves carefully disassembling the Sony ULT WEAR 900N headphones to reveal the problematic components and replacing them with genuine spare parts. While prior soldering experience may be useful, it’s not mandatory. With a bit of patience and attention to detail, you can replace the failing components in the Sony WH-ULT900N wireless headphones at home.

Replacement Parts You’ll Need

Restore the form and functionality of your Sony ULT WEAR headphones with genuine spares. Select the OEM replacement parts from the drop-down menu below to bring your device back to peak working condition.

• Sony ULT Wear WH-ULT900N Battery 702428 520mAh Replacement Repair Kit with Tools

 

• Sony ULT WEAR 900N WH-ULT900N Headphones Arm Hanger Hinge Swivel Repair - Parts

 

• Sony ULT Wear WH-ULT900N Ear Cup Swivel Hinge Assembly OEM Replacement Parts

 

• Sony ULT Wear WH-ULT900N Arm Hanger Swivel Holder OEM Replacement Parts

 

Looking for another spare part? Browse the Joe’s GE Parts Catalog for the Sony ULT WEAR (WH-ULT900N) to find genuine replacement parts for your headphones.

Tools You’ll Need

Before starting the Sony WH-ULT900N teardown, gather the following tools. Using the correct instruments will help you complete the repair successfully. We used the following tools and recommend them for a safe, professional-quality DIY fix at home.

• 1.5mm Phillips Screwdriver
• Nylon Spudger
• 1.5mm Flathead Screwdriver
• Strong Metal Pry Tool
• Curved Precision Tweezers
• Soldering Iron
• Soldering Flux
• Heat Gun
• Heat-proof Anti-skid Rubber Work Mat

Don’t want to DIY? Let our certified techs handle the repair for you. Book your repair now.

Step-by-Step Sony ULT WEAR (WH-ULT900N) Full Teardown Guide

In this detailed DIY teardown guide, we show you how to disassemble and repair the Sony WH-ULT900N wireless Bluetooth headphones yourself. Follow each step carefully and use the accompanying images as a visual guide to complete the repair with confidence.

Step 1: Extract the Left and Right Earpad Cushions

1.1. Insert a strong metal pry tool into the seam between the earpad cushion and the earcup, then gently work the tool around the perimeter till the retaining clips pop out of the socket, separating the two parts.

1.2. Remove the foam mesh pad and set it aside.

Repeat both steps on the other side.

Step 2: Disassemble the Right Earcup

We'll begin disassembling the headphones from the right side, as the battery is located inside the right earcup. You should always disconnect the battery before desoldering wires to prevent accidental short-circuits and damage to internal components.

2.1. Unfasten the 8 small black screws with a 1.5mm Phillips screwdriver, then store them carefully in one of the slots in the rubber work mat.

Ninja Tip: If the screws refuse to come out, you can extract them with precision tweezers.

2.2. Insert a 1.5mm flathead screwdriver into the seam between the outer touch panel and the earcup, then gently pry up with the tool to separate the two parts. Be careful not to tear the touch ribbon connected to the main board.

2.3. Disconnect the touch ribbon cable with a flathead screwdriver.

2.4. Unplug the battery ribbon with a flathead screwdriver.

2.5. Insert a nylon spudger below the battery and gently pry upward to dislodge the double-sided tape.

Sony WH-ULT900N Battery Repair Guide: If the battery in your device is dead or failing, follow our detailed Sony ULT WEAR (WH-ULT900N) DIY battery replacement guide to restore your headphones' battery life.

2.6. Unplug the last ribbon cable from the main board with a nylon spudger.

2.7. Apply flux on all the solder points.

2.8. Use a soldering iron to desolder all the wires from the main board. Before removing any wires, take a clear photo of their positions to use as a reference during reassembly. This will help ensure each wire is soldered back to the correct pad.

2.9. Unfasten the 2 silver screws securing the earcup to the headband assembly with a 1.5mm Phillips screwdriver.

2.10. Remove the waterproof gasket and set it aside in a safe place for reinstallation later.

2.11. Lift the earcup out and away from the hinge assembly.

2.12. Unfasten the 2 silver screws securing the power board to the earcup with a 1.5mm Phillips screwdriver.

2.13. Remove the glue securing the wire to the speaker driver with a flathead screwdriver.

Important Note: You can apply heat with a heat gun or hair dryer to soften the adhesive.

2.14. Remove the single screw securing the plastic filter, then lift the filter out and set it aside for reinstallation later.

2.15. Insert a flathead screwdriver into one of the grooves on the speaker driver and lift it away from the earcup housing.

Step 3: Disassemble the Right Headband Hinge

3.1. Pull the main wire out from the hinge assembly and set it aside.

3.2. Remove the green O-ring from the side with the main wire with a flathead screwdriver, then keep it safe for reassembly.

3.3. Unfasten the single 1.5mm Phillips screw and store it safely away from the other screws.

3.4. Use a flathead screwdriver to gently lift the outer panel of the headband swivel and move it out of the way. Wiggle the retaining tab back and forth and slide it out rather than pulling up, as lifting it may damage or break the retaining clip.

3.5. Remove the metal horseshoe piece with precision tweezers.

3.6. Slide the hinge assembly away from the headband swivel.

3.7. Unfasten the 2 screws securing the headband hinge.

3.8. Separate the inner and outer panels by sliding them out from the headband.

3.9. Unfasten the 2 screws from the inside panel.

3.10. Separate the inside panel from the hinge assembly.

3.11. Pull the main wire out from the headband hinge assembly.

Sony WH-ULT900N Left and Right Hinge Swivel Replacement Tutorial: If the hinge swivel assembly in your Sony ULT WEAR is broken or damaged, follow our detailed Sony ULT WEAR (WH-ULT900N) DIY hinge swivel replacement guide to restore your headphones' form and function.

Step 5: Disassemble the Left Earcup

5.1. Unfasten 8 black screws and store them separately. Use precision tweezers to extract any stubborn hardware.

5.2. Insert a flathead screwdriver into the seam between the outer panel and the earcup and lift the tool to remove the left outer panel, then unplug it from the Bluetooth board.

5.3. Remove the waterproof gasket and preserve it for reinstallation.

5.4. Disconnect the 3 ribbon cables from the Bluetooth board with a nylon spudger.

5.5. Apply a small amount of soldering flux to the solder joints, then use a soldering iron to desolder the main internal wire from the Bluetooth board.

5.6. Unfasten the two 1.5mm Phillips screws attached to the earcup hinge swivel.

5.7. Extract the left earcup from the headband.

5.8. Unfasten the 3 silver screws from the Bluetooth board with a 1.5mm Phillips screwdriver.

5.9. Unfasten the single screw attached to the plastic cover, then set the cover aside.

5.10. Extract the speaker driver from the earcup housing.

5.11. Unfasten the single screw attached to the AUX and charger PCB.

Step 6: Disassemble the Left Headband Hinge

6.1. Pull the main wire out from inside the earcup hinge swivel.

6.2. Remove the green O-ring gasket and set it aside.

6.3. Unfasten the 1.5mm Phillips screw attached to the top plastic part of the earcup swivel assembly.

6.4. With a flathead screwdriver, lift the top plastic part of the swivel hinge, then wiggle and pull it out from the socket. Do not pull or lift the part, as it will break the retaining clip.

6.5. Remove the metal horseshoe piece with precision tweezers, then set it aside.

6.6. Unfasten the two 1.5mm Phillips screws from the headband hinge assembly.

6.7. Separate the inner and outer panels of the slider mechanism by sliding them apart.

6.8. Unfasten the 2 screws from the headband slider.

6.9. Separate the inner panel and pull the main wire out from inside the hinge assembly.

Congratulations! Your Sony ULT WEAR (WH-ULT900N) Wireless Bluetooth Headphones Teardown Is Complete

You have completely disassembled the Sony ULT WEAR headphones to the bare bones. Replace malfunctioning components with OEM spare parts from our store, then retrace your steps to assemble and restore them to peak working condition.

If you found this guide helpful and would like to try your hand at DIY gadget repair, visit our store for essential tools and spare parts. You can also check out our at-home DIY headphones repair guides for other popular brands, including Apple, Beats, Bose, and Sony.

Have questions or suggestions about this repair? Text a repair ninja or email us, and we’ll reply shortly.