Important display massage error

Hi AUNG1098,

Thank you for participating in the Apple Support Communities. We understand you're receiving an "Unknown Part" error message on your iPhone. It looks like you've come from a helpful article that explains how to check the parts and service history: About genuine iPhone displays - Apple Support. As mentioned in the article:

"An Unknown Part  message will appear if the display installation is incomplete or if the display:

• Was replaced with a nongenuine display
• Was already used or installed in another iPhone
• Isn't functioning as expected"

Since the issue is hardware related, we recommend contacting Apple Support directly. They can run a diagnostic remotely or help with setting up an appointment to have your iPhone properly evaluated by a technician. You can also find locations and set up appointments using the Apple Support app which can be downloaded in the App Store.

We hope this helps.

Take care.