Automotive Multimedia System Testing
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Automotive Multimedia System Testing
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Automotive Multimedia System Testing
Power Board, Video Board, and LCD Board Functional Testing Technical Solution
1. Design Objectives
This plan is intended for the functional testing of the customer's "Power Board, Video Board, and LCD Board" projects. Under this plan, a SRC-based connection function test system will be established by carefully aligning with the customer's specific functional requirements and technical specifications. This approach ensures that the system meets the customer's expectations, enabling fast and accurate detection as required.
2. Design Basis
| Serial Number |
Project |
Specific parameter requirements | Total Demand Paths / Number of Concurrent Demands |
| 1 |
Circuit board connection |
Connect the Power board, Video board, and LCD board together using probe cables to form the test system unit. |
(80 + 22 + 50) × 2 + 12 + 8 + 40 + 10 + 12 + 22 Adapter board (The connection cable between the LCD board and the display should be as short as possible; a adapter board must be used, and the adapter board is connected to the LCD board via manual insertion of a flexible ribbon cable.) |
| 2 | Accessory component connection | Using probe cable-to-connector adapters, connect the auxiliary accessories required by the system under test—such as the "DVD drive, CAMERA, USB flash drive, SD card, fan, and multi-function steering wheel simulation unit"—to the system. Once the physical connections are established, partial functional tests can be performed. (Detailed information on the physical connection relationships between each auxiliary test component and the system under test, including interface definitions, is essential to ensure accurate system connectivity.) FM, AM, and GPS signals are coupled to the board under test via high-frequency probes. |
When FMAM and GPS signals cannot meet testing requirements due to the limitations of the high-frequency probe, a cylinder-driven mechanism is employed to enable rapid connection of the signal cables. |
| 3 | Power supply | Voltage output range: 0–18V, with a current supply capability of up to 3A; (emulates an automotive battery) | 1/1 |
| 4 | Voltage Measurement | Key voltage point testing for the Power board, Video board, and LCD board. Voltage range: 0–24V; Voltage accuracy: Better than 0.5% |
21 + 26 + 12 / 1 |
| 5 | CAN Communication |
Perform data communication with the MCU on the Power board under test via a CAN-based physical connection. |
2/2 |
| 6 | LIN Bus Communication Test | Perform data communication with the MCU on the Power board under test, using a physical connection based on the LIN Bus. (The customer must provide the physical layer definition and communication protocol.) | 1/1 |
| 7 | Simulated keypress | Use a relay to simulate the buttons on the multi-function steering wheel, replacing the need for manual button presses. (Requires understanding the physical connection between the multi-function steering wheel and the system under test.) | Multiple channels / 1 |
3. Test Items
3.1 DVD Function Test: The quality of the DVD is automatically assessed by simulating an automatic click on the DVD playback button, followed by analyzing whether audio is produced using an audio analyzer.
3.2 Rearview and Night Vision Function Testing: The rearview function test is triggered via CAN commands from the testing system and indicated through prompts. The night vision function test, meanwhile, relies on manual image detection prompted by the testing system. The results (NG or Good) are then fed back to the testing system by clicking the fixture button.
3.3 MIC Test (Voice Assistant Test): The system tests by playing recorded voice prompts through the speaker, while operators manually check for responses displayed on the LCD screen. The results—either NG or Good—are then fed back to the testing system.
Version 3.4 Detection: Implementation of the tested board version detection via CAN commands.
3.5 HDD Test: A test that detects the HDD via CAN communication.
3.6 LIN Bus Communication Test: Initiate the LIN test of the board under test via CAN communication, receive data transmitted by the board through the LIN transceiver, and use software to analyze and verify the data.
3.7 Fan Test: Initiate the fan test of the board under test via CAN communication, read back the data through CAN, and let the software analyze and evaluate the results.
3.8 Temperature Detection: Initiate the temperature test of the board under test via CAN communication, and read back the temperature data also through CAN communication. The read-back temperature is considered valid if it falls within a specified range.
3.9 Multi-function Steering Wheel Button Test: Using a combination of resistors and switches to simulate the multi-function steering wheel, the system initiates the test of the board’s multi-function steering wheel buttons via CAN communication. It then reads back the button data through CAN communication and compares it with the actual button inputs.
3.10 SD Card Read/Write Test: Initiate the SD Card read/write test of the board under test via CAN communication, retrieve the data back through CAN communication, and then use software to analyze and verify the data.
3.11 FM and AM Testing: Control the FM/AM signal generator to produce the specified frequencies, then use CAN communication to initiate the tuner-search test on the board under test and play the designated radio station. Finally, analyze whether the audio is present using an audio analyzer to determine if the test was successful. The FM frequency is set to 999, and the AM frequency is set to 1999.
3.12 WIFI and BT Function Testing: The test system is equipped with a WiFi hotspot. It initiates the WIFI test of the board under test via CAN communication. The board then connects to WiFi according to the configuration stored in the SD card, and the system reads back the data through CAN communication for software-based data analysis and validation. Additionally, the test system includes an Android phone configured for auxiliary testing—specifically, it’s set to automatically play a designated music track on loop while Bluetooth is enabled. The system starts the Bluetooth test of the board under test using CAN communication. The board performs Bluetooth pairing based on the settings stored in the SD card. Once connected, the system retrieves the Bluetooth connection status of the device and automatically evaluates whether the connection meets the predefined criteria.
3.13 Touchscreen, Button/Knob Testing: The test system prompts instructions for manual-assisted sliding and knob tests of the screen. The test system initiates the board under test via CAN communication, while operators manually evaluate the results and then provide feedback (by clicking the fixture button) to the test system, indicating whether the result is NG or Good.
3.14 LCD Screen Test: The system will prompt you; manually assist in completing the LCD screen test. After testing, provide feedback (NG or Good) to the test system by clicking the fixture button.
3.15 Dimmer Brightness Test: Conduct the test during the LCD screen evaluation.
3.16 AMP GPIO Testing: Use an oscilloscope to read waveform data and determine whether the waveform's duty cycle falls within a specified range.
3.17 USB Audio Playback Test: Initiate the USB audio playback test via CAN commands, and use an audio analyzer to determine whether sound is present.
3.18 GPS Testing: Manually set up the GPS signal generator, or use an existing GPS signal already available in the factory. The device’s built-in GPS receiver antenna will capture the GPS signal, and the time will be read back via CAN communication. This read-back time will then be compared with the computer system’s current time to determine accuracy. The GPS signal antenna uses an automated docking mechanism; however, if this method proves unreliable, manual plugging and unplugging will be employed instead.
3.19 Power Detection: Multimeter Automatically Detects
4. System Overview
