This repair guide provides detailed instructions on how to disassemble the Fenix 3 HR and replace faulty components, including the screen, battery, back cover, and more.
Why Go for Garmin Fenix 3 HR Replacement Parts Instead of Purchasing a New Watch?
Go for damaged Garmin Fenix 3 HR replacement parts in order to repair common damages such as screen crack, battery, charging issues, buttons, and back cover damage.
Replacement Parts for Garmin Fenix 3 HR You'll Need
Before starting the repair, prepare the appropriate replacement components.
Replacement LCD Display for Garmin Fenix 3 HR
Replace the display for Garmin Fenix 3 HR if your watch has:
- Cracked glass
- No image
- Flickering display
- Dead pixels
- Touch not responding
- Screen separation
A complete LCD display for Garmin Fenix 3 HR restores both image quality and touch responsiveness.
Replacement Battery for Garmin Fenix 3 HR
Install a replacement battery for Garmin Fenix 3 HR if:
- Battery drains quickly
- Watch won't charge completely
- Unexpected shutdowns occur
- Battery is swollen
- Reduced GPS runtime
A new battery can restore the original battery life and overall performance.
Back Cover Case for Garmin Fenix 3 HR
Replace the back cover case for Garmin Fenix 3 HR if you notice:
- Broken charging contacts
- Heavy scratches
- Damaged heart rate sensor window
- Corrosion from moisture
- Broken screw mounts
Replacing the rear housing also helps maintain the watch's structural integrity.
Repair Tools for Garmin Fenix 3 HR
Prepare the following tools:
- H1.3 Hex screwdriver
- T5 Torx screwdriver
- Plastic opening tool
- Nylon spudger
- Tweezers
- Magnetic screw tray
How to Safely Disassemble the Garmin Fenix 3 HR
Whether you are replacing the screen, battery, or back cover, you must first complete the disassembly process.
Step 1: Remove the Garmin Fenix 3 HR Screen
Use an H1.3 hex screwdriver to remove the five 7mm screws on the watch casing.
Tip: These screws are very small, so organize and store them carefully to avoid losing them.
Step 2: Separate the Garmin Fenix 3 HR Screen
Insert a plastic opening tool between the watch casing and the body.
Slowly slide it along the edges to gradually separate the casing.
Do not pull the screen up directly, as the display ribbon cable is still connected to the motherboard.
Step 3: Disconnect the Garmin Fenix 3 HR Display Ribbon Cable
Carefully disconnect the display ribbon cable from the motherboard using tweezers.
Once disconnected, you can separate the display assembly from the motherboard.
Then you can install the replacement Garmin Fenix 3 HR display onto the motherboard.
Before fully reassembling and reinstalling the five screws, it is recommended to power on the device briefly to test:
- Screen brightness
- Touch responsiveness
- Dead pixels
- Display alignment
Testing beforehand helps avoid having to reopen the device later.
Step 4: Remove the Garmin Fenix 3 HR Motherboard
Remove the loose GPS antenna located at the top of the casing to prepare for repair.
Use a T5 Torx screwdriver to remove the two screws securing the motherboard.
The motherboard is still connected to a ribbon cable. Disconnect this cable carefully.
Gently lift the motherboard.
Then install the new replacement motherboard.
Note: Do not force it if you feel resistance.
Step 5: Remove the Garmin Fenix 3 HR Battery
Disconnect the battery cable from the motherboard.
The battery is secured with adhesive, so use a nylon spudger to gently pry it off.
After removal, install the new battery.
First, connect the battery cable to the motherboard to ensure correct alignment.
Then use adhesive to secure the new battery in place before reassembling the device.
If you need to replace the Garmin Fenix 3 HR back cover case, you can transfer all repaired components into the new back cover case.
Important Notes for Replacing the Garmin Fenix 3 HR LCD Display
- Keep the five screws from the screen frame safe
- Pay attention to the ribbon cable between the display and motherboard
Important Notes for Replacing the Garmin Fenix 3 HR Motherboard
- Keep the two motherboard screws safe
- Be careful with the ribbon cable between the motherboard and back cover
Important Notes for Replacing the Garmin Fenix 3 HR Battery
- Ensure the battery connector is properly aligned with the motherboard to avoid damaging the pins
- Do not use metal tools during disassembly to avoid puncturing or bending the battery, which can be dangerous
- Use a nylon spudger to gently pry the battery away from the motherboard
Reassembly Checklist
Before closing the watch, confirm:
- Display cable connected securely
- Battery connector fully seated
- Motherboard screws tightened
- GPS antenna correctly installed
- Rear cover aligned properly
- No cables pinched inside the housing
Power on the watch and test:
- Display
- Touchscreen
- Heart rate sensor
- Charging
- GPS
- Buttons
Common Garmin Fenix 3 HR Repair Questions
Why is my Garmin Fenix 3 HR screen black?
A black display may be caused by:
- Failed LCD display
- Loose display connector
- Battery failure
- Motherboard damage
Installing a new Garmin Fenix 3 HR screen is often the first solution if the watch powers on but nothing is displayed.
Can I replace only the battery?
Yes. If your display is working normally, you can simply install a replacement battery for Garmin Fenix 3 HR without replacing other components.
Is replacing the Garmin Fenix 3 HR back cover worth it?
Yes. A new back cover case for Garmin Fenix 3 HR restores the appearance of the watch and can improve protection if the original housing is cracked or corroded.
Can I repair the Garmin Fenix 3 HR at home?
Yes. With basic precision tools and patience, most users can successfully replace the battery, LCD display, or rear housing in under one hour.
Final Thoughts
Learning the process of taking apart the Fenix 3 HR is very helpful when trying to repair the watch, because it is much simpler than one may think. Regardless of whether you need to change LCD screen for Garmin Fenix 3 or install a new battery for the Garmin Fenix 3 HR or put a new back cover for Garmin Fenix 3 HR, the use of good quality replacement parts for Garmin Fenix 3 HR will greatly prolong its life span.
Instead of buying a completely new watch, repairing its parts is a great option to save money.
