1. Introduction
The SIMDOG iTestBox DL400 PRO is an advanced 8-in-1 screen testing device designed for efficient and accurate testing of various mobile phone screens, including iPhone models from 6 to 13MINI. It features a unique LED folding display, high-speed testing capabilities, and a robust design, making it an essential tool for screen repair and refurbishment.
2. Product Overview
2.1 Key Features
- Wide Compatibility: Supports iPhone 6 through 13MINI (18 models), including original and assembly screens.
- Integrated LED Folding Display: Provides real-time test data, voltage, and current readings.
- High-Speed Testing: 1-second test entry and 2.5-second model switching for display, touch, 3D, current, voltage, and original color repair.
- Comprehensive Testing: Capable of testing display quality (black, white, red, blue, green, gradient, dead pixels, bright spots, gray spots, shadows), touch functionality (accurate touch point, broken touch, screen jumping), and 3D Touch sensitivity.
- Advanced Functions: Supports FOG test and original color repair (True Tone) for iPhone 8-13 Mini.
- Long Battery Life: Equipped with a 3460mAh high-capacity battery and super-fast charging.
- Durable Design: Full metal shell with a light green finish.
2.2 Package Contents
The iTestBox DL400 PRO package includes the following items:
- DL400 PRO Host Unit (x1)
- Storage Box (x1)
- U Disk (for system upgrades) (x1)
- Charging Head (x1)
- Data Cable (x1)
- Spare Small Board (x1)
- iPhone 6 to 13PM Test Cables (full set)
- iPhone 13 Test Cable (x1)
- iPhone 13 Mini Test Cable (x1)

Figure 2.1: iTestBox DL400 PRO device with its LED folding display.

Figure 2.2: Product parameters and included accessories.
Video 2.1: An overview of the iTestBox DL400 PRO, showcasing its unboxing and key features.
3. Setup
3.1 Charging the Device
Before first use, fully charge the iTestBox DL400 PRO. Connect the provided data cable to the Type-C charging port on the device and the charging head to a power outlet. The device features two charging ports for convenience.

Figure 3.1: Two Type-C charging ports on the iTestBox DL400 PRO.
3.2 Powering On/Off
To power on the device, press and hold the Power button located on the side. The LED display will illuminate. To power off, press and hold the Power button again until the display turns off.
3.3 Connecting Test Cables
Identify the appropriate test cable for the iPhone model you intend to test. Each cable is labeled for quick identification. Carefully connect the test cable to the corresponding slot on the iTestBox DL400 PRO. Ensure a secure connection to prevent inaccurate readings.

Figure 3.2: Connecting iPhone series test cables to the device.
4. Operation
4.1 Navigating the Interface
The iTestBox DL400 PRO features a folding LED display that provides clear operational tips and test results. Use the physical buttons on the device to navigate through modes, adjust brightness, and switch between test functions.

Figure 4.1: Folding large screen design for clear operation tips.
4.2 Performing Screen Tests
The device supports various screen tests to diagnose issues. Once a test cable is connected and the device is powered on, you can select the desired test mode.
- Display Test: Checks for black, white, red, blue, green, and gradient display issues, including dead pixels, bright spots, gray spots, and shadows.
- Touch Test: Verifies touch functionality, accurately locating touch points and detecting issues like unresponsive areas, broken touch, or screen jumping.
- 3D Touch Test: Assesses 3D Touch sensitivity across the screen, from weak to strong pressure levels.
- True Tone Repair (Gamma): Supports original color repair for compatible iPhone models (8-13 Mini).
- Screen Brightness Test: Measures and displays screen brightness from 0% to 100%.
- Voltage and Current Display: The LED display shows real-time voltage and current, which can help identify hidden screen problems, such as distinguishing original screens based on bright/black screen current gaps.

Figure 4.2: Examples of Display, Touch, and 3D Touch tests.

Figure 4.3: Advanced testing capabilities including True Tone and brightness.

Figure 4.4: Detailed test patterns for display and touch functions.
5. Maintenance
5.1 General Care and Cleaning
Keep the iTestBox DL400 PRO clean and free from dust and debris. Use a soft, dry cloth to wipe the device. Avoid using harsh chemicals or abrasive materials that could damage the surface or screen. Store the device in its provided storage box when not in use to protect it from physical damage.
5.2 System Upgrades
The iTestBox DL400 PRO system is upgradable. Use the included U disk to install new firmware or compatibility files as they become available. Refer to the official SIMDOG website or support channels for the latest upgrade instructions and files.
6. Troubleshooting
If you encounter issues with your iTestBox DL400 PRO, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low battery; Power button not pressed correctly. | Charge the device fully. Press and hold the Power button firmly for a few seconds. |
| Inaccurate test results. | Loose cable connection; Incorrect test cable used; Outdated firmware. | Ensure test cables are securely connected. Verify the correct cable for the iPhone model. Update the device firmware. |
| Screen not detected. | Damaged test cable; Screen itself is faulty; Incorrect cable connection. | Try a different test cable. Ensure the screen is properly connected to the test cable. Test a known good screen if possible. |
7. Specifications
| Parameter | Value |
|---|---|
| Product Number | DL400 |
| Product Weight | 220g |
| Input Voltage | DC5V~2A |
| Charging Port | Type-C |
| Working Humidity | <90%RH |
| Color | Green |
| Material | Metal |
| Product Size | 75*156*12mm |
| Battery Capacity | 3460mAh |
| Operating Temperature | -20°C~85°C |
| Storage Temperature, Humidity | -30°C~85°C, <90%RH |
8. Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or visit the official SIMDOG website. Keep your purchase receipt as proof of purchase for any warranty claims.