What does the Unknown part message mean for an aftermarket display?
Short answer
Modern phones keep a Parts and Service History. A part the system cannot verify may be shown there as Unknown part. A third-party aftermarket display is not verified by the phone maker, so this message is a normal possibility after fitting one - it describes the part's verification status, not whether the display works. The diagnostic result and the history status vary by model and iOS version; per-model test reports are available on request.
In detail
Verification and function are two different things. A display can light, touch and perform correctly while still being unverified in the history, because verification is the phone maker's own process for its own parts.
The maker lists diagnostic programming as an optional service, available on request before shipping; it is a programming service, not a change of status for the part. The JK-16ProMax uses a Novatek IC. That is a component fact about the driver and touch chip. No component choice turns a third-party part into a verified one, and no seller can promise a specific history status for every model and software version.
Software updates can change pairing and history behaviour, so any statement about diagnostics is tied to the model and the iOS version tested. Ask for the per-model test report for the exact models you buy, and re-check after major software updates.
Tell your end customers before the repair, not after: a one-line note at booking - that the phone may show the part as unverified in its service history - prevents most complaints.
Reference specifications
| Line | JK Soft OLED (flagship) |
| Verified model | JK-16ProMax |
| Display type | Soft OLED, self-luminated (no separate backlight) |
| Touch structure | Metal Mesh |
| Brightness range | 1000+ cd/m2 |
| Contrast ratio | 1:100000 |
| Colour gamut (NTSC 1931) | 110% |
| Colour temperature | 6600K |
| Screen size | 6.9 inch |
| Resolution | 1320 x 2868 |
| Refresh rate | 120 Hz high refresh |
Where this applies
- Training counter staff to explain the message before a repair
- Answering a marketplace buyer's question about diagnostics
- Writing the diagnostics section of your own product page
Questions on this topic
Does the message mean the display is faulty?
No. It records verification status. Function is judged by the display and touch test.
Can you state that a model shows no message?
Only per model and per software version, from a test report. Ask for the report for your models rather than relying on a general statement.
Working with Simiai Technology
Simiai Technology in Shenzhen handles export enquiries for the JK and Moshi PLUS (MS-PLUS) display lines. Share the models you need, the quantity per model and your destination market, and we reply in writing with the specification sheet for those models and the terms for that order. Per-model test reports and compliance documentation are available on request.
Bottom line
Sell the display on its measured display and touch performance, and be plain about verification: unverified parts may show as Unknown part, and the exact result depends on model and software version.
Related guides
- Soft OLED vs Hard OLED vs Incell: how should a repair wholesaler choose?
- What should a wholesaler check when a shipment of replacement displays arrives?
- Why must a replacement display be tested before it is installed?
Send an RFQ
Tell us the models, quantities per model and your market. Terms are confirmed in writing per order; detailed documentation is available on request.
WhatsApp: +86 130 7787 8567 Email: hemingwang@simiai.top