How to Replace Screen For iPhone with a Polar Tech OEM Screen Replacem
How to Replace iPhone Screen Without “Unknown Part” Warning
If you’ve ever replaced the screen on an iPhone — you’ve probably run into that dreaded “Unknown Part” message. While the warning doesn’t actually affect the function of the phone, it does create doubt for customers. Is the part genuine? Will it affect performance or safety? And when it comes to reselling, that little warning can seriously hurt the value.
But now, there's a fix.
Introducing the Polar Tech Self-Diagnostic Display
Polar Tech has just released a revolutionary screen that brings third-party iPhone screen repairs to a whole new level. This screen is diagnostic-capable, meaning it works seamlessly with Apple’s own repair interface. The result? A screen swap that:
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Doesn’t trigger “Unknown Part” alerts
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Doesn’t require transplanting the original screen IC
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Comes with True Tone preloaded
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Works with Apple's factory configuration process
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Feels and functions just like the original
This is a game-changer for phone repair pros and DIYers alike.
What You’ll Need
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Screwdriver set
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Magnetic screw mat
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Isopropyl alcohol
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Magic self-heating pads or a heat gun
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Screen opening tools
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Optional: waterproof adhesive gasket
Step-by-Step Screen Replacement
1. Update to iOS 18.1 or later
Before anything else, make sure the iPhone is running iOS 18.1 or higher. The built-in display diagnostics required for this repair method won’t work on earlier versions. If you're not already updated, go to Settings > General > Software Update and install the latest version.
2. Remove the pentalobe screws
Take out the two screws near the charging port. Place them on a magnetic screw mat—they’re different lengths, so don’t mix them up.
3. Power off and heat the screen
Turn off the phone. Apply heating pads or a heat gun to soften the adhesive around the edges.
4. Use alcohol and opening tools
Slip a thin metal card into the seam and apply a few drops of isopropyl alcohol. Gently work around the edges until the screen can be lifted from the side with the power button. Be careful not to tear the flex cables.
5. Disconnect the battery
Remove the protective bracket and unplug the battery to prevent short-circuiting during installation.
6. Connect the new display — but skip the sensor flex
During diagnostics, do not connect the proximity sensor flex cable. This step is crucial to allow the system to complete display configuration properly.
7. Boot up and follow Apple’s diagnostics
Once powered on, the phone will display a “Finish your display repair” prompt. Tap through to begin diagnostics. The system will validate the screen and display a “Part is genuine” message.
8. Automatic True Tone download
iOS will automatically retrieve display calibration and True Tone data from Apple’s servers—no manual writing required.
9. Final verification
After a restart, the “Unknown Part” warning will be gone. You can check the display replacement history in Settings > General > About under “Parts & Service.”
10. Complete the physical install
Power off the device, transfer the proximity sensor flex cable from the old screen to the new one (using heat and alcohol to soften the adhesive). Apply a new waterproof gasket if available, reconnect all components, and screw everything back together.
Final Thoughts
This method is the closest thing to an official Apple screen replacement—without the Apple price tag or restrictions. No warning messages, no lost features, and no compromise on quality. Whether you're a repair technician or a DIY enthusiast, Polar Tech’s diagnostic display makes iPhone repairs faster, smarter, and more professional than ever.
Need help sourcing Polar Tech screens or tools? Drop us a line—we're here to help.
🛒Where to buy [Self Service Repair No Error Message] parts?
Polar Tech OEM No Error Message Screen:
👉Shop now: https://www.polartech.com.au/collections/polar-tech-iphone-oem-screen
Polar Tech OEM No Error Message Battery:
👉Shop now: https://www.polartech.com.au/collections/polar-tech-iphone-oem-battery
