CN112562553A - Test system and test method of liquid crystal control module - Google Patents
Test system and test method of liquid crystal control module Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 21
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- 238000012216 screening Methods 0.000 description 9
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- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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Abstract
The invention discloses a test system of a liquid crystal control module, which comprises a test tool and test software; the testing tool comprises a bottom plate, a key plate, a switching power supply, an industrial personal computer, a display and a mouse, wherein the switching power supply is connected with the bottom plate, the key plate is connected with the bottom plate through an IO bus, the industrial personal computer and the bottom plate are in serial port communication through RS232-1 and RS232-2 interfaces, and the industrial personal computer is respectively connected with the display and the mouse; the bottom plate is provided with a board card for inserting the control module to be tested; the test software is installed on an industrial personal computer. The invention designs special test software, can automatically input test commands and can automatically test and judge, and meanwhile, the existing test tool is improved in an integrated mode, so that cables and equipment are reduced, the test tool is easier to place and assemble, and the test efficiency is obviously improved.
Description
Technical Field
The invention relates to the technical field of liquid crystal screens, in particular to a test system and a test method of a liquid crystal control module.
Background
The space of the existing tool platform for screening the temperature box is limited, tools are difficult to place (4 sets/boxes), and batch production is not easy. The tool comprises the following components:
1. the liquid crystal control module screening test tool is provided with the following wire harness source wires, RS232 cables, RS422 cables, VGA cables, IO output cables and IO input cables, and the total number is 48;
2. the liquid crystal control module screening test tool is provided with the following devices: VGA display, MOXA box;
3. the liquid crystal control module screening test tool is provided with a plurality of following tool board cards: a bottom plate, a back plate;
4. the liquid crystal control module screening test tool is provided with the following switches: 16 push-button switches.
Obviously, the existing tool platform has many wiring harnesses, and is not easy to identify and place; the number of tooling equipment is large, and the MOXA box parameter adjustment is troublesome; the tooling board cards are many and are not easy to assemble; the tool switches are multiple, and the test and the placement are not easy; the space placement requirement of the existing temperature box is not met; the requirement of the time node of the existing production task can not be met.
The liquid crystal control module screening test has the following test items: RS232 port, 422 port, VGA port, IO output port, IO input port, RTC real-time clock and watchdog.
The existing testing technology:
1. screening test software: EXE and serial port assistant.
2. The test method comprises the following steps: after the complex commands are input by using DNW.exe software through the IO output port and the IO input port, and the feedback information is visually observed whether to be correct or not in a DNW.exe window while corresponding keys are pressed by hands; the RS232 port and the 422 port mutually send commands by using serial port assistant software to artificially judge whether the functions are normal or not; the RTC real-time clock and the watchdog function are used for visually observing feedback information in a DNW.exe window after a DNW.exe software is used for inputting a complex command and manually judging whether the function is correct or not; and the VGA port is used for observing whether the image in the display screen is correct or not after a complex command is input by using DNW.
The problems existing in the prior testing technology are as follows:
1. the testing method is complicated, the software interfaces are more, the command input is easy to be wrong, and the manual judgment cannot realize the technical prevention;
2. the test efficiency was low (20 minutes/set);
3. the retention test time of the screening temperature is limited, and batch screening test (2 sets/round) is not easy;
4. the requirement of the time node of the existing production task can not be met.
Disclosure of Invention
The invention provides a test system and a test method of a liquid crystal control module, which solve the problems that a liquid crystal control module test tool platform is large in size, difficult to assemble, complex in test operation, incapable of meeting the requirements of time nodes of the existing production task and the like, can automatically input an input command of a test item, can automatically judge the correctness of the output of the test item, solve the problems that the operation is complex in the prior art, and manual judgment cannot realize technical prevention, and improve the test efficiency.
The invention is realized by the following technical scheme:
a test system of a liquid crystal control module comprises a test tool and test software;
the testing tool comprises a bottom plate, a key plate, a switching power supply, an industrial personal computer, a display and a mouse, wherein the switching power supply is connected with the bottom plate, the key plate is connected with the bottom plate through an IO bus, the industrial personal computer and the bottom plate are in serial port communication through RS232-1 and RS232-2 interfaces, and the industrial personal computer is respectively connected with the display and the mouse;
the bottom plate is provided with a board card for inserting the control module to be tested;
the test software is installed on an industrial personal computer;
the bottom plate integrates an RS422-3 or RS422-4 interconnection test function; the bottom plate integrates the functions of RS422-2 to RS 232-1; the bottom plate integrates a function of converting a VGA display interface by using a DAC;
the key board integrates an IO input and output function and integrates a power state indicating function of the control module;
the industrial personal computer prints related information output by the control module system through the RS232-1 port, displays a test result through the display, and tests a communication function between the RS232-2 and the RS232-1 through the RS232-2 port.
The testing software comprises two interface functions of RS232-1 and RS232-2, an IO input state testing module, an IO output state testing module, a key input state testing module, an RS422-1 and RS232-2 communication mutual testing state testing module, an RS422-3 and RS422-4 communication mutual testing state testing module, a watchdog testing module, an RTC testing module and a VGA output testing module, wherein the two interface functions of RS232-1 and RS232-2 carry out transceiving communication through 2 formats of 'characters' and '16 systems'.
The IO output is changed into the indicator light and is integrated on the key board; placing the IO input key switch on the key board; integrating 422-2 functionality of the MOXA box onto the backplane; integrating the functions of the VGA tool back plate on a bottom plate; the functions of the RS422-3 and the RS422-4 are integrated on the bottom plate; the method comprises the following steps of integrating dispersed wire harnesses (48) such as an IO output wire harness, an IO input wire harness, a power line, 422-2 wires, RS232 wires and the like into 1 wire harness; the types of the test platform equipment, the wire harness and the board card are reduced, and the assembly is easy; complex wire harnesses are simplified, and the testing operation is easy; the volume of the test platform is reduced; meanwhile, by designing a special test software, the interface of the software is simple and easy to operate, all functional items to be tested can be tested, the input command of the test item can be automatically input, the correctness of the test item can be automatically judged, and the test efficiency is greatly improved. The invention also provides a test method based on the test system, which comprises the following steps:
(1) inserting a control module to be tested on a board card of a bottom plate, turning on a switching power supply, electrifying the control module to be tested, and turning on test software on an industrial personal computer;
(2) performing function tests, including an IO input state test, an IO output state test, a key input state test, an RS422-2 and RS232-1 communication mutual test state test, an RS422-3 and RS422-4 communication mutual test state test, a watchdog test, an RTC test and a VGA output test;
(3) and after the test is finished, the test software is closed, the switching power supply is closed, and the power is cut off for the control module.
Specifically, the specific process of the IO input state test is as follows: clicking an IO input parameter button of an IO input state testing module of testing software, sending a testing command by the testing software, clicking the IO button of a key board, inputting corresponding IO input information into a bottom board by the key board, transmitting the IO input information to a control module by the bottom board, converting the input information into serial port information by the control module, sending the serial port information to the testing software, detecting whether the IO input information is received by a serial port interrupt function of the testing software, if the IO input information is detected, turning green the color of an IO input state indicating lamp corresponding to a testing software interface, indicating that the function is normal, and otherwise, keeping the original red state unchanged.
Specifically, the specific process of the IO output state test is as follows: clicking an IO output test button of an IO output state test module of the test software, outputting corresponding test information by the test software and sending the test information to the control module through a serial port, sending control information to the bottom plate by the control module according to the test information, outputting high level or low level to the IO button corresponding to the key plate by the control bottom plate, observing an IO button indicating lamp corresponding to the key plate, if the indicating lamp is green, indicating that the IO output is normal, otherwise, indicating that the IO output is abnormal.
Specifically, the specific process of the key input state test is as follows: the method comprises the steps that an external interrupt key test button of a test software key input state test module is clicked, test software sends a test command, then the corresponding key button of a key board is clicked, the corresponding key input information is input into a bottom board by the key board, the key input information is transmitted to a control module by the bottom board, the control module converts the input information into serial port information and sends the serial port information to the test software, a serial port interrupt function of the test software detects whether the key input information is received, if the key input information is detected, the color of a key input state indicator lamp corresponding to a test software interface turns green to indicate that the function is normal, and if not, the original red state is kept unchanged.
Specifically, the specific process of the RS422-2 and RS232-1 communication mutual test state test is as follows: clicking a button '422-2 to 232LCD 422' of a communication mutual testing state testing module of the testing software RS422-2 and RS232-1, sending a testing command by the testing software, sending a command to the RS422-2 and RS232-1 mutually, sending a command to interrupt serial port communication by the RS232-1, capturing feedback information of the serial port by the testing software, judging whether the command sent mutually is received by using an interrupt function, if the command is received, changing the color of a corresponding indicating lamp of an interface of the testing software to green to indicate that the function is normal, otherwise, keeping the original red state.
Specifically, the specific process of the RS422-3 and RS422-4 communication mutual test state test is as follows: clicking an RS422-3-4 interconnection test button of a test software RS422-3 and RS422-4 communication mutual test state test module, sending a test command by the test software, sending a command by RS422-3 and RS422-4 mutually, sending a command by RS232-1 to interrupt serial port communication, grabbing feedback information of the serial port by the test software, judging whether the command sent mutually is received by using an interrupt function, if the command is received, the corresponding indicator lamp color of a test software interface turns green to indicate that the function is normal, otherwise, keeping the original red state.
Specifically, the specific process of the watchdog test is as follows: clicking a 'watchdog restart' button of a test software watchdog test module, sending a test command to a control module by the test software, feeding restart information back to the test software by the control module, printing the restart information transmitted by the control module by the test software through an industrial personal computer, simultaneously judging whether the restart information contains a command for confirming the restart, if the restart information contains the command, judging whether an indicator lamp corresponding to a test software interface turns green to indicate that the function is normal, and otherwise, displaying an original red state by the indicator lamp corresponding to the test software interface.
Specifically, the specific process of the RTC test is as follows: clicking a 'RTC clock test' button of an RTC test module of the test software, sending a command to the control module by the test software through a serial port, sending a real-time clock signal to the test software by the control module, printing the clock information by the test software through an industrial personal computer at intervals, judging whether the clock changes according to the printed clock information, if so, indicating that the RTC is normal, otherwise, indicating that the RTC is abnormal.
Specifically, the specific process of the VGA output test is as follows: clicking a 'display interface VGA test' button of a VGA output test module of the test software, sending a VGA display signal to the control module by the test software through a serial port, feeding back a control message to the test software by the control module, and judging whether the display is normal or not through the display.
The invention has the following advantages and beneficial effects:
1. the invention provides a test system and a test method of a liquid crystal control module, which are used for testing all functional items to be tested, have simple interfaces and easy operation and can effectively avoid the functional missing test;
2. the invention provides a test system and a test method of a liquid crystal control module, input commands of all test items are automatically input by test software, so that the problem that human input is easy to make mistakes when the input commands are complex is avoided;
3. the invention provides a test system and a test method of a liquid crystal control module, wherein the output information of all test items is automatically judged by test software to be correct, so that the problem that the judgment cannot realize technical prevention is solved;
4. the invention provides a test system and a test method of a liquid crystal control module, which obviously improve the test efficiency of a single set of products, namely 3 minutes per set (the existing test technology needs 20 minutes); batch production is realized, and 12 sets/round of production are realized;
5. the invention provides a test system and a test method of a liquid crystal control module, which can meet the requirement of the time node of the existing production task.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a structural view of a tooling platform of the present invention.
FIG. 2 is a functional block diagram of the test software of the present invention.
FIG. 3 is a flow chart of a testing method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
The embodiment provides a test system of a liquid crystal control module, which enables a test tool to be optimized in an integrated mode, and simultaneously designs a special test software to optimize a traditional test mode of manual instruction input and manual feedback information judgment, specifically as shown in fig. 1-2.
The testing tool comprises a bottom plate, a key plate, a switching power supply, an industrial personal computer, a display and a mouse, wherein the switching power supply is connected with the bottom plate, the key plate is connected with the bottom plate through an IO bus, the industrial personal computer and the bottom plate are in serial port communication through RS232-1 and RS232-2 interfaces, and the industrial personal computer is respectively connected with the display and the mouse;
the bottom plate of the embodiment is provided with a board card for inserting the control module to be tested;
the test software of the embodiment is installed on an industrial personal computer.
(1) The bottom plate integrates the interconnection test function of RS422-3 and RS 422-4; the bottom plate integrates the functions of RS422-2 to RS 232-1; the bottom plate integrates the function of converting VGA display interface by DAC;
(2) the keyboard plate integrates an IO input function, an IO output function and a key input function; the key board integrates the power state indicating function of the control module;
(3) the industrial personal computer outputs related information through the RS232-1 port printing control module system, and a test result is displayed through the display; and testing the communication function between the RS232-2 and the RS232-1 through the RS232-2 port.
The cable connection of the embodiment is simplified, the number of wire harnesses is reduced from 48 to 5, and the installation complexity is reduced; functions of RS422 conversion, VGA conversion and the like are highly integrated on the bottom plate, and tooling equipment and tooling board cards are reduced; an interface protection circuit is added, so that the test is safer; the keyboard plate highly integrates IO input, IO output, key input, 3.3V module voltage display and 5V module voltage display functions; an external switch is removed, so that the test process is simplified; the occupied product placing space and the test tool space are greatly reduced, and batch production is realized.
The test software of the embodiment comprises two interface functions of RS232-1 and RS232-2, an IO input state test module, an IO output state test module, a key input state test module, a communication mutual test state test module of RS422-2 and RS232-1, a communication mutual test state test module of RS422-3 and RS422-4, a watchdog test module, an RTC test module and a VGA output test module, wherein the two interface functions of RS232-1 and RS232-2 carry out transceiving communication through 2 formats of 'character' and '16 system'.
The embodiment further provides a testing method based on the testing system, as shown in fig. 3, the method specifically includes the following steps:
(1) inserting a control module to be tested on a board card of a bottom plate, turning on a switching power supply, electrifying the control module to be tested, and turning on test software on an industrial personal computer;
(2) performing function tests, including an IO input state test, an IO output state test, a key input state test, an RS422-2 and RS232-1 communication mutual test state test, an RS422-3 and RS422-4 communication mutual test state test, a watchdog test, an RTC test and a VGA output test;
and IO input state testing: clicking an IO input parameter button of an IO input state testing module of testing software, clicking an IO input parameter button on a testing software interface, sending a testing command by the testing software, clicking the IO button of a key board, inputting corresponding IO input information into a bottom board by the key board, transmitting the IO input information to a control module by the bottom board, converting the input information into serial port information by the control module, and sending the serial port information to the testing software, detecting whether the IO input information is received by a serial port interrupt function of the testing software, if the IO input information is detected, turning green the color of an IO input state indicating lamp corresponding to the testing software interface to indicate that the function is normal, otherwise, keeping the original red state unchanged.
And (3) IO output state testing: clicking an IO output test button on an IO output state test module interface of the test software, outputting corresponding test information by the test software and sending the test information to the control module through a serial port, sending control information to the bottom plate by the control module according to the test information, outputting high level or low level to the IO button corresponding to the key plate by the control bottom plate, observing an IO button indicating lamp corresponding to the key plate, if the indicating lamp turns green, indicating that the IO output is normal, otherwise, indicating that the IO output is abnormal.
Testing the key input state: the method comprises the steps that an external interrupt key test button on a test software key input state test module interface is clicked, test software sends a test command, then the corresponding key button of a key board is clicked, the corresponding key input information is input into a bottom board by the key board, the key input information is transmitted to a control module by the bottom board, the control module converts the input information into serial port information and sends the serial port information to the test software, a serial port interrupt function of the test software detects whether the key input information is received, if the key input information is detected, the color of a key input state indicator lamp corresponding to the test software interface turns green to indicate that the function is normal, and otherwise, the original red state is kept unchanged.
RS422-2 and RS232-1 communication mutual testing state test: clicking a button '422-2 to 232LCD 422' on an interface of a testing software RS422-2 and RS232-1 communication mutual testing state testing module, sending a testing command by the testing software, sending a command to the RS422-2 and RS232-1 mutually, sending the command to interrupt serial port communication by the RS232-1, capturing feedback information of the serial port by the testing software, judging whether the command sent mutually is received by using an interrupt function, if the command is received, turning green corresponding to an indicating lamp on the interface of the testing software to indicate that the function is normal, and otherwise, keeping the original red state.
RS422-3 and RS422-4 communication mutual testing state test: clicking an RS422-3-4 interconnection test button on an interface of a test software RS422-3 and RS422-4 communication mutual test state test module, sending a test command by the test software, sending a command by RS422-3 and RS422-4 mutually, sending a command by RS232-1 to interrupt serial port communication, grabbing feedback information of the serial port by the test software, judging whether the command sent mutually is received by using an interrupt function, if the command is received, the corresponding indicator light color of the interface of the test software turns green to indicate that the function is normal, otherwise, keeping the original red state.
Watchdog test: clicking a watchdog restart button on a test software watchdog test module interface, sending a test command to a control module by test software, feeding restart information back to the test software by the control module, printing the restart information transmitted by the control module by the test software through an industrial personal computer, simultaneously judging whether the restart information contains a command for confirming that the restart is performed, if the restart information contains the command, judging whether an indicator lamp corresponding to the test software interface turns green or not, indicating that the function is normal, and otherwise, displaying an original red state by the indicator lamp corresponding to the test software interface.
RTC test: clicking a 'RTC clock test' button on an RTC test module interface of the test software, sending a command to the control module by the test software through a serial port, sending a real-time clock signal to the test software by the control module, printing the clock information by the test software through an industrial personal computer at intervals, judging whether the clock changes according to the printed clock information, if so, indicating that the RTC is normal, otherwise, judging that the RTC is abnormal.
VGA output test: clicking a display interface VGA test button on a VGA output test module interface of the test software, sending a VGA display signal to the control module by the test software through a serial port, feeding back a control message to the test software by the control module, and judging whether the display is normal or not through the display.
(3) And after the test is finished, the test software is closed, the switching power supply is closed, and the power is cut off for the control module.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A test system of a liquid crystal control module is characterized by comprising a test tool and test software;
the testing tool comprises a bottom plate, a key plate, a switching power supply, an industrial personal computer, a display and a mouse, wherein the switching power supply is connected with the bottom plate, the key plate is connected with the bottom plate through an IO bus, the industrial personal computer and the bottom plate are in serial port communication through RS232-1 and RS232-2 interfaces, and the industrial personal computer is respectively connected with the display and the mouse;
the bottom plate is provided with a board card for inserting the control module to be tested;
the test software is installed on an industrial personal computer;
the bottom plate integrates the interconnection test function of RS422-3 and RS 422-4; the bottom plate integrates the functions of RS422-2 to RS 232-1; the bottom plate integrates a function of converting a VGA display interface by using a DAC;
the key board integrates an IO input and output function, and the key board integrates a power state indication function of the control module;
the industrial personal computer prints related information output by the control module through the RS232-1 port, displays a test result through the display, and tests a communication function between the RS232-2 and the RS232-1 through the RS232-2 port;
the testing software comprises two interface functions of RS232-1 and RS232-2, an IO input state testing module, an IO output state testing module, a key input state testing module, a communication mutual testing state testing module of RS422-2 and RS232-1, a communication mutual testing state testing module of RS422-3 and RS422-4, a watchdog testing module, an RTC testing module and a VGA output testing module, wherein the two interface functions of RS232-1 and RS232-2 carry out transceiving communication through 2 formats of 'character' and '16 system'.
2. A method for testing a test system based on a liquid crystal control module as claimed in claim 1, the method comprising the steps of:
(1) inserting a control module to be tested on a board card of a bottom plate, turning on a switching power supply, electrifying the control module to be tested, and turning on test software on an industrial personal computer;
(2) performing function tests, including an IO input state test, an IO output state test, a key input state test, an RS422-2 and RS232-1 communication mutual test state test, an RS422-3 and RS422-4 communication mutual test state test, a watchdog test, an RTC test and a VGA output test;
(3) and after the test is finished, the test software is closed, the switching power supply is closed, and the power is cut off for the control module.
3. The test method according to claim 2, wherein the specific process of the IO input state test is as follows: clicking an IO input parameter button of an IO input state testing module of testing software, sending a testing command by the testing software, clicking the IO button of a key board, inputting corresponding IO input information into a bottom board by the key board, transmitting the IO input information to a control module by the bottom board, converting the input information into serial port information by the control module, sending the serial port information to the testing software, detecting whether the IO input information is received by a serial port interrupt function of the testing software, if the IO input information is detected, turning green the color of an IO input state indicating lamp corresponding to a testing software interface, indicating that the function is normal, and otherwise, keeping the original red state unchanged.
4. The test method according to claim 2, wherein the specific process of the IO output state test is as follows: clicking an IO output test button of an IO output state test module of the test software, outputting corresponding test information by the test software and sending the test information to the control module through a serial port, sending control information to the bottom plate by the control module according to the test information, outputting high level or low level to the IO button corresponding to the key plate by the control bottom plate, observing an IO button indicating lamp corresponding to the key plate, if the indicating lamp is green, indicating that the IO output is normal, otherwise, indicating that the IO output is abnormal.
5. The testing method of claim 2, wherein the specific process of the key input state test is as follows: the method comprises the steps that an external interrupt key test button of a test software key input state test module is clicked, test software sends a test command, then the corresponding key button of a key board is clicked, the corresponding key input information is input into a bottom board by the key board, the key input information is transmitted to a control module by the bottom board, the control module converts the input information into serial port information and sends the serial port information to the test software, a serial port interrupt function of the test software detects whether the key input information is received, if the key input information is detected, the color of a key input state indicator lamp corresponding to a test software interface turns green to indicate that the function is normal, and if not, the original red state is kept unchanged.
6. The testing method according to claim 2, wherein the specific process of the RS422-2 and RS232-1 communication mutual testing state test is as follows: clicking a button '422-2 to 232LCD 422' of a communication mutual testing state testing module of the testing software RS422-2 and RS232-1, sending a testing command by the testing software, sending a command to the RS422-2 and RS232-1 mutually, sending a command to interrupt serial port communication by the RS232-1, capturing feedback information of the serial port by the testing software, judging whether the command sent mutually is received by using an interrupt function, if the command is received, changing the color of a corresponding indicating lamp of an interface of the testing software to green to indicate that the function is normal, otherwise, keeping the original red state.
7. The testing method according to claim 2, wherein the specific process of the RS422-3 and RS422-4 communication inter-testing state test is as follows: clicking an RS422-3-4 interconnection test button of a test software RS422-3 and RS422-4 communication mutual test state test module, sending a test command by the test software, sending a command by RS422-3 and RS422-4 mutually, sending a command by RS232-1 to interrupt serial port communication, grabbing feedback information of the serial port by the test software, judging whether the command sent mutually is received by using an interrupt function, if the command is received, the corresponding indicator lamp color of a test software interface turns green to indicate that the function is normal, otherwise, keeping the original red state.
8. The test method according to claim 2, wherein the specific process of the watchdog test is as follows: clicking a 'watchdog restart' button of a test software watchdog test module, sending a test command to a control module by the test software, feeding restart information back to the test software by the control module, printing the restart information transmitted by the control module by the test software through an industrial personal computer, simultaneously judging whether the restart information contains a command for confirming the restart, if the restart information contains the command, judging whether an indicator lamp corresponding to a test software interface turns green to indicate that the function is normal, and otherwise, displaying an original red state by the indicator lamp corresponding to the test software interface.
9. The method according to claim 2, wherein the specific process of the RTC test is as follows: clicking a 'RTC clock test' button of an RTC test module of the test software, sending a command to the control module by the test software through a serial port, sending a real-time clock signal to the test software by the control module, printing the clock information by the test software through an industrial personal computer at intervals, judging whether the clock changes according to the printed clock information, if so, indicating that the RTC is normal, otherwise, indicating that the RTC is abnormal.
10. The method according to claim 2, wherein the VGA output test is performed by: clicking a 'display interface VGA test' button of a VGA output test module of the test software, sending a VGA display signal to the control module by the test software through a serial port, feeding back a control message to the test software by the control module, and judging whether the display is normal or not through the display.
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