Diagnostic Assessment (Mail-In Service)
If you are unsure of the exact fault, we recommend selecting our
£20 Diagnostic Assessment.
Your device will be professionally inspected and tested before any repair work is undertaken.
- £20 diagnostic fee payable at booking
- If you proceed with repair, the £20 is deducted from your final invoice
- If you decline repair, the fee covers inspection time, testing, and reporting
Customer shipping to LTTR is paid at checkout. Return shipping is included within the repair price where applicable.
Important: Apple Component Pairing & System Notifications
Modern iPhone models use a manufacturer pairing system that digitally links certain components — including the display, battery, and some camera modules — to the device’s logic board.
When these parts are replaced, particularly with aftermarket or refurbished components, iOS will typically display a system notification such as:
- “Important Display Message”
- “Unknown Part”
- Limited battery health or component reporting
These notifications relate to Apple’s verification system. They do not indicate a faulty repair and do not affect core functionality such as touch response, display performance, charging, or general device operation.
Professional Repairs & Premium Components
LTTR offers carefully selected replacement components to suit different budgets and preferences. All repairs are completed using controlled installation procedures and comprehensive post-repair testing.
Screen Replacement Options
All displays are professionally installed, aligned, resealed, and fully tested prior to dispatch.
- Aftermarket / Budget OLED – Cost-effective replacement designed to restore display clarity and touch performance. Minor variations in brightness or tone may occur compared to original factory panels.
- OEM Refurbished Apple Panel – Original Apple OLED display with refurbished outer glass for near-factory visual quality.
- Genuine Apple Service Display – Brand-new Apple service component equivalent to factory specification.
Aftermarket and some refurbished displays will typically trigger an
“Important Display Message” within iOS due to Apple’s component verification system. This does not impact normal device functionality.
Battery Replacement Options
All battery replacements include professional installation, calibration, and system verification prior to return.
- Aftermarket / Budget Battery – Cost-effective replacement designed to restore battery capacity and charging performance. May display an “Unknown Part” notification on supported models.
- OEM Grade Battery – High-quality replacement designed to closely match original performance and longevity.
- Genuine Apple Service Battery – Official Apple service component equivalent to factory specification, offering the closest experience to original factory performance.
LTTR Quality Assurance
- Professional installation with clean fitment standards
- Comprehensive functional testing before return
- Device performance verification
- Workmanship assurance