A VGA interface test fixture
By using plug-in VGA male and female connectors in the VGA interface test fixture, combined with signal cable and power supply test modules, the problem of disassembling the VGA interface is solved, enabling fast and stable signal testing, and improving test accuracy and equipment compatibility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING SIETIUM SEMICON CO LTD
- Filing Date
- 2025-07-10
- Publication Date
- 2026-08-04
AI Technical Summary
In existing technologies, VGA interfaces require disassembly for measurement, which is inconvenient for pin measurement and results in unstable signals. It is also impossible to detect short circuits or open circuits. Traditional testing solutions cannot be used to perform effective testing when the device is enclosed.
The device uses plug-in VGA male and female connectors to directly connect the VGA interface and the test instrument. It combines high-speed signal lines of the three primary colors and small signal lines to set test points, enabling rapid testing of signal quality, connectivity, and power supply capability.
Without disassembling the device casing, rapid testing of VGA interface signal transmission was achieved, improving testing stability and accuracy while reducing operational complexity and cost.
Smart Images
Figure CN224594689U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of computer interface testing equipment technology, and in particular to a VGA interface testing fixture. Background Technology
[0002] VGA, short for Video Graphics Array, is a computer display standard that uses analog signals. A VGA interface is a dedicated interface that outputs data using the VGA standard. VGA interfaces are typically used for transmitting analog signals between computer graphics cards, monitors, and other devices.
[0003] Since VGA interfaces are mainly used in computers or monitors, their application environment requires frequent plugging and unplugging. Therefore, VGA interfaces are prone to mechanical damage due to frequent plugging and unplugging, which can lead to reduced transmission efficiency or broken conductive lines inside the interface, easily affecting the normal operation of the VGA interface. Therefore, it is necessary to test the VGA interface from time to time to ensure that the VGA interface can work normally.
[0004] Existing testing procedures for VGA interfaces in computers or monitors require disassembling the product before measurement. Even after disassembly, the small pin spacing and dense pin arrangement can make measurement inconvenient. Furthermore, without a VGA interface test fixture, the unpredictable position of the measurement probes or sensors leads to unstable and inaccurate signals. Moreover, traditional VGA interface testing methods cannot measure short circuits or open circuits between pins. Utility Model Content
[0005] This application provides a VGA interface test fixture, which solves the problem in the prior art that the product needs to be disassembled and the pin measurement is inconvenient during the measurement process of VGA interface. It realizes the technical effect of quickly testing the integrity of the internal circuit of VGA interface while the product is encased, and ensuring the quality stability and connectivity of the signal during the test.
[0006] To achieve the above objectives, this application provides the following technical solution:
[0007] A VGA interface test fixture includes a printed circuit board (PCB) and further includes: a connector module comprising a plug-in VGA male connector and a plug-in VGA female connector; one end of the plug-in VGA male connector is connected to a VGA interface, and the other end is connected to the PCB; one end of the plug-in VGA female connector is connected to a test instrument, and the other end is connected to the end of the PCB furthest from the plug-in VGA male connector; a signal test module comprising multiple high-speed three-primary-color signal lines and multiple small signal lines disposed on the PCB; test points are provided on both the high-speed signal lines and the small signal lines; a power supply test module comprising a power line disposed on the PCB, and two test points are provided on the power line; and a ground wire disposed on the PCB, and test points are provided on the ground wire.
[0008] In conjunction with the first aspect, in one possible implementation, the three primary color high-speed signal lines are three.
[0009] In conjunction with the first aspect, in the second possible implementation, the impedance of the three primary color high-speed signal lines is 75Ω, and a test point is provided at the end of each three primary color high-speed signal line.
[0010] In conjunction with the first aspect, in the third possible implementation, the small signal line includes a horizontal synchronization line, a vertical synchronization line, a data channel line, and a three-phase input line; each of the small signal lines is provided with a test point, and the test point of each small signal line is a through-hole pad structure.
[0011] In conjunction with the first aspect, in a fourth possible implementation, the power supply test module further includes a pin and a shorting cap; the bottom end of the pin is connected to the printed circuit board, and the top end of the pin is connected to the shorting cap.
[0012] In conjunction with the fourth possible implementation of the first aspect, in the fifth possible implementation, the power supply test module receives a 5V power supply; the two test points of the power line are connected by the pins and the shorting cap to achieve on / off control.
[0013] In conjunction with the first aspect, in the sixth possible implementation, the test point of the ground wire is centrally located on the ground wire, and the test point of the ground wire is a through-hole pad structure.
[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:
[0015] This application embodiment utilizes plug-in VGA male and female connectors to directly connect the VGA interface and testing instruments. Combined with test points on the high-speed and low-signal lines of the three primary colors, it enables rapid testing of the VGA interface's signal quality, connectivity, and power capability during signal transmission without disassembling the device casing. It offers advantages such as strong compatibility, ease of operation, and low cost. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 This is a structural diagram of a VGA interface test fixture provided in an embodiment of this application.
[0018] Figure label: 1-Printed circuit board; 2-VGA male connector; 3-VGA female connector; 4-Test point. Detailed Implementation
[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0020] Figure 1 This is a structural diagram of a VGA interface test fixture provided in an embodiment of this application. Figure 1 As shown, the VGA interface test fixture includes a printed circuit board 1 (PCB), a connector module, a signal test module, a power test module, and a ground wire.
[0021] Specifically, the connector module includes a plug-in VGA male connector 2 and a plug-in VGA female connector 3. The plug-in VGA male connector 2 and the plug-in VGA female connector 3 are respectively connected to the two ends of the printed circuit board 1. In addition to mechanical connection, the internal interface in the plug-in VGA male connector 2 and the internal interface in the plug-in VGA female connector 3 are also electrically connected to the internal circuit on the printed circuit board 1.
[0022] The end of the VGA male connector 2 furthest from the printed circuit board 1 (i.e., the Source signal transmitting end) is used to connect to the VGA interface, and the end of the VGA female connector 3 furthest from the printed circuit board 1 (i.e., the Sink signal receiving end) is used to connect to the test instrument. Taking a computer as an example, the Source signal transmitting end is mainly connected to the host, and the Sink signal receiving end is mainly connected to the monitor.
[0023] The signal testing module includes multiple signal lines. Each signal line is embedded in the printed circuit board 1 using screen printing or other printing methods, and each signal line has a test point 4 for testing. Specifically, the signal testing module includes multiple high-speed signal lines of the three primary colors and multiple small signal lines.
[0024] The power supply test module includes power lines embedded in a printed circuit board 1 by screen printing or other means, with two test points 4 set on the power lines.
[0025] The ground wire is embedded in the printed circuit board 1 by screen printing or other means, and a test point 4 is also provided on the ground wire.
[0026] This embodiment of the application utilizes a plug-in VGA male connector 2 and a plug-in VGA female connector 3 to directly connect the VGA interface and the testing instrument. Combined with test points 4 set on the three primary color high-speed signal lines and small signal lines, it achieves rapid testing of the VGA interface's signal quality, connectivity, and power capability during signal transmission without disassembling the device casing. It has the advantages of strong compatibility, ease of operation, and low cost. It is suitable for the research and development debugging phase of VGA interfaces, as well as the troubleshooting phase of VGA interfaces.
[0027] In this embodiment of the application, there are three high-speed signal lines for the three primary colors: R high-speed signal line (RED red primary color component signal line), G high-speed signal line (GREEN green primary color component signal line) and B high-speed signal line (BLUE blue primary color component signal line). These three high-speed signal lines are collectively referred to as RGB high-speed signal lines (i.e., three primary color high-speed signal lines).
[0028] For example, in these three high-speed signal lines, the impedance of each high-speed signal line is 75Ω, and test point 4 is set at the end of each of the three primary color high-speed signal lines.
[0029] In this embodiment of the application, the small signal line includes a horizontal synchronization line (such as...). Figure 1 The HSYNC line shown is the horizontal sync line, and the vertical sync line is the vertical sync line (such as...). Figure 1The VSYNC line shown is the field sync line, the data channel line (DDC signal line, full name Display Data Channel), and the three-phase input lines (NC1 line and NC2 line, where NC1 is the three-phase input V line and NC2 is the three-phase input W line).
[0030] Among them, the test point 4 set on each small signal line is set on the printed circuit board 1 in the form of a through-hole pad structure.
[0031] The power supply test module also includes pins and shorting caps. The two pins at the bottom of the pin are inserted into two test points 4 on the power supply line. It should be noted that in the circuit board, the power supply line is divided into two sub-lines on the same horizontal line. A test point 4 is located near the end of each of these sub-lines. The two pins at the bottom of the pin are inserted into these two test points 4 respectively. The tip of the pin connects to the shorting cap, which protects the entire circuit from short circuits. The two sub-lines of the power supply line are disconnected when the pins and shorting caps are not inserted. When the pins and shorting caps are inserted into test points 4, the two sub-lines of the power supply line are connected, forming a conductive line.
[0032] The power supply test module input voltage is 5V (e.g., Figure 1 (See +5VF and +5VM). When it is necessary to test the stability of the output current, disconnect the pins from the power cord and use an electronic load tester or other instruments to measure the current supply capability of one end of the VGA male connector 2.
[0033] In this embodiment, the test point 4 on the ground wire is centrally located on the ground wire, and the test point 4 on the ground wire is arranged on the printed circuit board 1 in the form of a through-hole pad structure.
[0034] In the testing process of applying the VGA interface test fixture provided in this application to the product under test, the VGA interface test fixture described in the embodiments of this application is connected to the VGA interface of the product under test. Specifically, the testing process includes:
[0035] Connect the VGA interface test fixture to the VGA interface of the product under test.
[0036] With the product under test not powered on, use a multimeter to test each test point 4 on the VGA interface test fixture. Specifically, by testing multiple test points 4, the transmission function of the corresponding wires in the VGA interface test fixture is tested to see if it is complete, that is, to test whether there is a cold solder joint on the VGA interface. If the VGA interface is in a cold solder joint state, the multimeter will not beep when testing the corresponding test point 4 on the VGA interface test fixture using the short circuit setting of the multimeter.
[0037] With the product under test powered on, use a multimeter in voltage mode or an oscilloscope to test the corresponding test point 4 on the VGA interface test fixture to check whether the voltage or frequency of these signals reaches the expected value under normal working conditions.
[0038] The above tests can be performed with or without an assembled casing on the product under test. It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.
[0039] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.
Claims
1. A VGA interface test fixture, comprising a printed circuit board (1), characterized in that, Also includes: The connector module includes a plug-in VGA male connector (2) and a plug-in VGA female connector (3); one end of the plug-in VGA male connector (2) is connected to the VGA interface and the other end is connected to the printed circuit board (1); one end of the plug-in VGA female connector (3) is connected to a testing instrument and the other end is connected to the end of the printed circuit board (1) away from the plug-in VGA male connector (2); The signal testing module includes multiple high-speed signal lines of three primary colors and multiple small signal lines disposed on the printed circuit board (1); test points (4) are disposed on both the high-speed signal lines and the small signal lines. The power supply test module includes a power line disposed on the printed circuit board (1), and two test points (4) are disposed on the power line; Ground wire, which is provided on the printed circuit board (1), and test points (4) are provided on the ground wire.
2. The VGA interface test fixture according to claim 1, characterized in that, The three primary color high-speed signal lines are three in number.
3. The VGA interface test fixture according to claim 1, characterized in that, The impedance of the three primary color high-speed signal lines is 75Ω, and a test point (4) is provided at the end of each three primary color high-speed signal line.
4. The VGA interface test fixture according to claim 1, characterized in that, The small signal line includes a horizontal synchronization line, a vertical synchronization line, a data channel line, and a three-phase input line; Each of the small signal lines is provided with a test point (4), and the test point (4) of each small signal line is a through-hole pad structure.
5. The VGA interface test fixture according to claim 1, characterized in that, The power supply test module also includes pins and shorting caps; The bottom end of the pin is connected to the printed circuit board (1), and the top end of the pin is connected to the shorting cap.
6. The VGA interface test fixture according to claim 5, characterized in that, The power supply test module is input with a 5V power supply. The two test points (4) of the power line are connected and disconnected via the pins and the shorting cap.
7. The VGA interface test fixture according to claim 1, characterized in that, The test point (4) of the ground wire is centrally located on the ground wire, and the test point (4) of the ground wire is a through-hole pad structure.