Samsung S24 Ultra Sub-Board Replacement-No Charging?

📱 Samsung S24 Ultra Sub-Board Replacement

If your Samsung S24 Ultra is having charging issues, signal problems（particular case）, or other faults related to the sub-board, replacing it can often solve these problems. This guide will walk you through the process step-by-step, making it easy to fix your phone yourself.

🛠️ Tools You’ll Need

Polar Tech Magic Self-Heating Pad (or similar heating tool)
Polar Tech Phone Repair Toolkit (Isopropyl alcohol ,Metal shim, Plastic pry card, Tweezers, Spudger, Precision screwdriver set)
Adhesive strips or pre-cut waterproof adhesive

⚡ Important Notes Before You Start

Disconnect the battery as soon as you open the phone to avoid electrical damage.
Make sure to use the exact same sub-board version (e.g., “U” version) to avoid compatibility issues.

Step 1: 🔥 Heat and Separate the Back Cover

Power off the Samsung S24 Ultra . Heat the back cover for about 10 minutes using a Polar Tech Magic Self-Heating Pad to soften the glue.

Carefully use a thin metal tool to create a small gap between the back cover and phone body. Drip some alcohol into the gap to weaken the adhesive. Then, use a plastic pick to gently work around the edges and separate the glue. Add more alcohol if needed and take your time to avoid damage.

Step 2: 🔩 Remove Internal Parts

Inside, there are 15 screws securing the shields. Remove the screws starting from the top section, then take off the mainboard shield.

Important: Disconnect the battery first to prevent short circuits.

Remove the low speaker assembly, secured with six screws, then use a spudger to lift out the speaker assembly along with the sub-board shield.

Step 3: 🔄 Replace the Sub-Board

Disconnect all flex cables connected to the sub-board and remove the SIM card tray.

Remove the three screws holding the sub-board, then gently lift it out with tweezers.

Note: The sub-board comes in different versions (e.g., the “U” version for US models). Always replace it with the same version to avoid signal or performance issues.

Step 4: ✅ Reassemble and Test

Place the new sub-board in position, reconnect all cables, and tighten screws.

Reinstall the loudspeaker and mainboard bracket, securing all screws.

Before closing the phone, test the charging port and other key functions to ensure everything works properly.

Finally, close the back cover securely.

🎯 Conclusion

By carefully following these steps and using the right tools, you can easily replace the sub-board on your Samsung S24 Ultra and fix charging or signal problems（particular case）. Remember to double-check the sub-board version and test your device thoroughly before sealing it up. With patience and care, your phone will be working like new again!

📩 Need help with your device?

If you have any questions or need further details,contact us or leave a comment below. We’re always happy to help.

👋 See you in the next one!