Now Reading: Samsung Galaxy A21s Camera Lens Glass Replacement | Back Cover & Fingerprint Flex Repair Guide
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Samsung Galaxy A21s Camera Lens Glass Replacement | Back Cover & Fingerprint Flex Repair Guide
Samsung Galaxy A21s Camera Lens Glass Replacement | Back Cover & Fingerprint Flex Repair Guide
Scratched, cracked, or shattered camera lens glass can seriously reduce photo quality even when the camera sensors are perfectly functional. Dust entry, foggy photos, glare, or focus problems are common signs of damaged outer lens glass. This detailed DIY repair guide explains how to safely replace the rear camera lens glass on the Samsung Galaxy A21susing professional repair methods.
This repair restores photo clarity while protecting the internal camera modules from dust and moisture damage.
Repair Difficulty ⭐⭐⭐☆☆ (Moderate)
Estimated Repair Time: 35 — 50 Minutes
Device Type: Smartphone
Repair Type: Rear Camera Lens Glass Replacement
Reasons for Camera Lens Replacement
You may need to replace the camera lens glass if:
- Camera lens glass is cracked or broken
- Photos appear blurry or hazy
- Dust or moisture entering camera area
- Scratches causing glare or light reflection
- Water exposure affecting lens clarity
- Cosmetic damage around camera module
Replacing only the outer lens glass is more affordable than replacing the entire camera module.
Required Tools
Prepare the following tools before starting:
- SIM ejector tool
- Plastic pry card or opening tool
- Suction cup
- Heating pad / heat gun / hair dryer
- Tweezers
- Replacement camera lens glass (with frame or without frame)
- B7000 glue or double-sided adhesive
- Rubber bands or binding clips
Step-by-Step Samsung Galaxy A21s Camera Lens Glass Replacement
Step 1 — Remove SIM Tray
Power off the phone completely.
Remove the SIM tray using a SIM ejector tool before opening the device.
Step 2 — Heat the Back Cover
The back cover is secured using strong adhesive.
Place the rear side on a heating pad and select the mobile heating option.
Alternatively, gently heat around the back cover edges using a hair dryer or heat gun until adhesive softens.
Avoid overheating the device.
Step 3 — Remove the Back Cover
Use a suction cup to create a small opening between the frame and rear cover.
Insert a plastic pry card and slowly cut through adhesive around the edges.
⚠️ Be careful — the fingerprint (Touch ID) flex cable connects the back cover to the motherboard.
Disconnect the fingerprint connector before removing the cover completely.
Step 4 — Remove Broken Camera Lens Glass
Turn the back cover over.
Apply gentle heat from the front side of the rear cover around the camera lens area to soften adhesive holding the lens.
Carefully apply light pressure to push out the damaged camera lens glass together with the frame if installed.
Remove any remaining adhesive residue carefully.
Step 5 — Choose Replacement Lens Type
Two replacement options are commonly available:
- Camera lens glass with frame (easier installation)
- Camera lens glass only (without frame).
Choose the required replacement based on availability.
Most replacement lenses include adhesive pre-installed.
If adhesive is missing, apply:
- B7000 glue, or
- Double-sided adhesive tape.
Carefully align the new lens and press firmly into position.
Step 6 — Remove Fingerprint Sensor from Back Cover
Apply slight heat to soften adhesive holding the fingerprint sensor.
Gently push and remove the fingerprint flex cable from the back cover.
Step 7 — Reconnect Fingerprint Sensor
Reconnect the fingerprint flex cable to the logic board.
Make sure the connector clicks securely into place.
Step 8 — Reattach Back Cover
Check whether adhesive remains strong around the back cover edges.
If required:
- Apply B7000 glue, or
- Install new double-sided adhesive.
Align carefully and press the back cover onto the phone body.
Step 9 — Secure Adhesive
Use binding clips or rubber bands to apply pressure around the edges.
Leave secured for some time until adhesive cures properly.
Frequently Asked Questions (FAQ)
Q1. Can I replace only the camera lens glass instead of the camera module?
Yes. If the camera sensor works properly, replacing the lens glass alone restores image clarity.
Q2. Do I need to open the entire phone for lens replacement?
Yes. Removing the back cover safely is necessary to access the lens assembly.
Q3. Will this repair fix blurry photos?
If blur is caused by scratches or cracks on the outer glass, replacement usually fixes it.
Q4. Is heating required?
Yes. Heating softens adhesive and prevents cracking the plastic back cover.
Q5. Should I clean inside before installing the new lens?
Yes. Remove dust and debris before installing the new lens to avoid trapped particles.
Troubleshooting (Q&A)
Q1. Dust visible inside camera after repair?
Remove the back cover again and clean the area before resealing.
Q2. Camera focus problems after replacement?
Ensure the lens glass sits flat and is not pressing against camera modules.
Q3. Back cover not sticking properly?
Apply fresh adhesive or B7000 glue and secure using rubber bands.
Q4. Fingerprint sensor not working?
Reconnect the fingerprint flex cable securely.
Q5. Glue leaking into camera area?
Use minimal adhesive and clean excess immediately before curing.
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