TV board card TCONLESS screen driving signal testing device

Abstract

The utility model relates to the technical field of TV board testing, in particular to a TV board card TCONLESS screen driving signal testing device which comprises a testing interface and a main control module. The test interface comprises a first signal unit, a second signal unit, a third signal unit, a fourth signal unit and a fifth signal unit; the first signal unit is electrically connected with the main control module after sequentially passing through the first switch module and the first operational amplifier module; the second signal unit is electrically connected with the main control module after sequentially passing through the second switch module and the second operational amplifier module; the third signal unit is electrically connected with the main control module after sequentially passing through the third switch module and the third operational amplifier module; the fourth signal unit is electrically connected with the main control module after sequentially passing through the fourth switch module and the fourth operational amplifier module; and the fifth signal unit is electrically connected with the main control module after sequentially passing through a fifth switch module and a fifth operational amplifier module. The device is high in test efficiency and high in accuracy.

Description

Technical Field

[0001] This utility model relates to the field of TV board testing technology, specifically to a TV board TCONLESS screen drive signal testing device. Background Technology

[0002] Currently, some television sets integrate a TCONLESS module into their TV board design. This module handles multiple signal types when connected to a display screen, including image signals, screen driver power, GAMMA signals, and CLK signals. Currently, TV board testing relies on manual connection to the matching display screen, followed by subjective judgment of the TV board's performance and compatibility. However, this testing method demands high skill levels from the testers, is slow, and is prone to misjudgments. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a TV board TCONLESS screen drive signal testing device.

[0004] To achieve the above objectives, the specific solution of this utility model is as follows: A TV board TCONLESS screen driver signal testing device, comprising a test interface and a main control module; the test interface includes a first signal unit, a second signal unit, a third signal unit, a fourth signal unit, and a fifth signal unit; the first signal unit is used for electrical connection with a 0-3.3V square wave signal on an external TV board; the second signal unit is used for electrical connection with a -15-50V square wave signal on an external TV board; the third signal unit is used for electrical connection with a -15-0V negative power supply signal on an external TV board; the fourth signal unit is used for electrical connection with a 0-50V positive power supply signal on an external TV board. The power signal is electrically connected; the fifth signal unit is used to electrically connect to the 0-3.3V power signal of the external TV board; the first signal unit is electrically connected to the main control module after passing through the first switch module and the first operational amplifier module in sequence; the second signal unit is electrically connected to the main control module after passing through the second switch module and the second operational amplifier module in sequence; the third signal unit is electrically connected to the main control module after passing through the third switch module and the third operational amplifier module in sequence; the fourth signal unit is electrically connected to the main control module after passing through the fourth switch module and the fourth operational amplifier module in sequence; the fifth signal unit is electrically connected to the main control module after passing through the fifth switch module and the fifth operational amplifier module in sequence.

[0005] Furthermore, a first square wave acquisition module is electrically connected between the first operational amplifier module and the main control module; a second square wave acquisition module is electrically connected between the second operational amplifier module and the main control module.

[0006] Furthermore, a first voltage follower module is provided between the first signal unit and the first switch module; a second voltage follower module is provided between the second signal unit and the second switch module; a third voltage follower module is provided between the third signal unit and the third switch module; a fourth voltage follower module is provided between the fourth signal unit and the fourth switch module; and a fifth voltage follower module is provided between the fifth signal unit and the fifth switch module.

[0007] Furthermore, the second operational amplifier module includes a second up-amplifier circuit and a second down-amplifier circuit; the output terminal of the second switching module is electrically connected to the input terminal of the second up-amplifier circuit; the output terminal of the second up-amplifier circuit is electrically connected to the input terminal of the second down-amplifier circuit; and the output terminal of the second down-amplifier circuit is electrically connected to the main control module.

[0008] Furthermore, a second buffer circuit is provided between the output terminal of the second switch module and the input terminal of the second lifting circuit.

[0009] Further, the second up-amplification circuit includes operational amplifier chip U21; the second down-amplification circuit includes operational amplifier chip U22; the inverting input terminal of operational amplifier chip U21 is electrically connected to the output terminal of the second switching module through resistor R21; the non-inverting input terminal of operational amplifier chip U21 is electrically connected to the first reference voltage Vreg; a resistor R22 is provided between the inverting input terminal and the output terminal of operational amplifier chip U21; the output terminal of operational amplifier chip U21 is electrically connected to the inverting input terminal of operational amplifier chip U22 through resistor R23; the non-inverting input terminal of operational amplifier chip U22 is electrically connected to the second reference voltage Vr; a resistor R24 ​​is provided between the inverting input terminal and the output terminal of operational amplifier chip U22; the output terminal of operational amplifier chip U22 is electrically connected to the main control module.

[0010] Furthermore, the third operational amplifier module includes an operational amplifier chip U31; the output terminal of the third switching module is connected to the inverting input terminal of the operational amplifier chip U31 via a resistor R31; the non-inverting input terminal of the operational amplifier chip U31 is electrically connected to the third reference voltage Vr3; the inverting input terminal of the operational amplifier chip U31 is electrically connected to the output terminal of the operational amplifier chip U31 via a resistor R32; and the output terminal of the operational amplifier chip U31 is electrically connected to the main control module via a resistor R33.

[0011] The fourth operational amplifier module includes an operational amplifier chip U41; the output terminal of the fourth switching module is connected to the inverting input terminal of the operational amplifier chip U41 via resistor R41; the non-inverting input terminal of the operational amplifier chip U41 is electrically connected to the fourth reference voltage Vr4; the inverting input terminal of the operational amplifier chip U41 is electrically connected to the output terminal of the operational amplifier chip U41 via resistor R42; and the output terminal of the operational amplifier chip U41 is electrically connected to the main control module via resistor R43.

[0012] Furthermore, the operational amplifier module includes an operational amplifier chip U11; the non-inverting input terminal of the operational amplifier chip U11 is electrically connected to the output terminal of the first switching module; the inverting input terminal of the operational amplifier chip U11 is electrically connected to the output terminal of the operational amplifier chip U11; and the output terminal of the operational amplifier chip U11 is electrically connected to the main control module.

[0013] The fifth operational amplifier module includes an operational amplifier chip U51; the output terminal of the fifth switching module is connected to the inverting input terminal of the operational amplifier chip U51 via a resistor R51; the non-inverting input terminal of the operational amplifier chip U51 is electrically connected to the first reference voltage; the inverting input terminal of the operational amplifier chip U51 is electrically connected to the output terminal of the operational amplifier chip U51 via a resistor R52; and the output terminal of the operational amplifier chip U51 is electrically connected to the main control module via a resistor R53.

[0014] Furthermore, a third buffer circuit is provided between the third switch module and the third operational amplifier module; a fourth buffer circuit is provided between the fourth switch module and the fourth operational amplifier module.

[0015] The beneficial effects of this invention are: by simply connecting the TV board to the test interface, signals other than image signals from the TV board can be acquired, such as screen driver power, GAMMA signals, and CLK signals. This eliminates misjudgments or missed tests caused by the subjective judgment of the testers, resulting in high testing efficiency. Attached Figure Description

[0016] The utility model will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present utility model. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0017] Figure 1 This is a circuit diagram of the first follower module of this utility model;

[0018] Figure 2 This is a circuit diagram of the first switch module of this utility model;

[0019] Figure 3 This is a circuit diagram of the first operational amplifier module of this utility model;

[0020] Figure 4 This is a circuit diagram of the first square wave acquisition module of this utility model;

[0021] Figure 5 This is a circuit diagram of the second follower module of this utility model;

[0022] Figure 6 This is a circuit diagram of the second switch module of this utility model;

[0023] Figure 7 This is the circuit diagram of the second operational amplifier module of this utility model;

[0024] Figure 8 This is a circuit diagram of the second square wave acquisition module of this utility model;

[0025] Figure 9 This is the circuit diagram of the third follower module of this utility model;

[0026] Figure 10 This is a circuit diagram of the third switch module of this utility model;

[0027] Figure 11 This is the circuit diagram of the third operational amplifier module of this utility model;

[0028] Figure 12 This is a circuit diagram of the fourth follower module of this utility model;

[0029] Figure 13 This is the circuit diagram of the fourth switch module of this utility model;

[0030] Figure 14 This is the circuit diagram of the fourth operational amplifier module of this utility model;

[0031] Figure 15 This is the circuit diagram of the fifth follower module of this utility model;

[0032] Figure 16 This is the circuit diagram of the fifth switch module of this utility model;

[0033] Figure 17 This is the circuit diagram of the fifth operational amplifier module of this utility model;

[0034] Figure 18 This is a circuit diagram of one of the chips in the main control module of this utility model;

[0035] Figure 19 This is a circuit diagram of another chip in the main control module of this utility model.

[0036] Among them: 1. Second buffer circuit; 2. Third buffer circuit; 3. Fourth buffer circuit. Detailed Implementation

[0037] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention. It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0038] like Figure 1-19 As shown in this embodiment, a TV board TCONLESS screen driver signal testing device includes a test interface and a main control module. The test interface includes a first signal unit, a second signal unit, a third signal unit, a fourth signal unit, and a fifth signal unit. The first signal unit is used to electrically connect to a 0-3.3V square wave signal on an external TV board. The second signal unit is used to electrically connect to a -15-50V square wave signal on an external TV board. The third signal unit is used to electrically connect to a -15-0V negative power supply signal on an external TV board. The fourth signal unit is used to electrically connect to a 0-50V positive power supply signal on an external TV board. The fifth signal unit is used to electrically connect to the 0-3.3V power supply signal of the external TV board; the first signal unit is electrically connected to the main control module after passing through the first switch module and the first operational amplifier module in sequence; the second signal unit is electrically connected to the main control module after passing through the second switch module and the second operational amplifier module in sequence; the third signal unit is electrically connected to the main control module after passing through the third switch module and the third operational amplifier module in sequence; the fourth signal unit is electrically connected to the main control module after passing through the fourth switch module and the fourth operational amplifier module in sequence; the fifth signal unit is electrically connected to the main control module after passing through the fifth switch module and the fifth operational amplifier module in sequence.

[0039] Specifically, during use, the TV board needs to be inserted into the corresponding test interface. TV boards are classified according to resolution, including standard definition (SD), high definition (HD), and 4K. The test interfaces in this technology include a single-channel interface for testing SD TV boards and a dual-channel interface for testing HD and 4K TV boards. Whether single-channel or dual-channel, the signals within the interface are categorized into five types based on their signal type:

[0040] (1) Square wave signals of 0 to 3.3V are usually TP, POL, CPV, STV, etc.

[0041] (2) Square wave signals of -15 to 50V, usually CLK, STV, LC1, LC2 and other signals;

[0042] (3) -15 to 0V negative power supply signal, usually VSS, VGL and other signals;

[0043] (4) 0-50V positive power supply signal, usually GAMMA, VGH and other signals;

[0044] (5) Positive power supply signal of 0 to 3.3V, usually VDD or similar signals.

[0045] When testing the TV board, connect the TV board to the test interface on the test board. Then, various types of signals from the test interface are processed by different types of switch modules and operational amplifier modules into signals that can be received by the main control module. To handle multiple signals, the main control module uses two STM32 chips.

[0046] like Figure 1-4 as well as Figure 18 As shown, the signal of the first signal unit in the test interface is:

[0047] The 0-3.3V square wave signal in the first signal unit is voltage followed by the first voltage follower module. Then, the signal is switched by the first switch module to select one of the signals. After being followed by the first operational amplifier module, it enters the first square wave signal acquisition module. At this time, the signal is divided into two paths: one is a periodic signal T, which is captured periodically by the T IMM ING port in the main control module; the other is a square wave signal, the voltage of which is connected to the ADC port in the main control module. Finally, the main control module processes the signal.

[0048] The first voltage follower module uses the OPA2192 operational amplifier chip, which has a high input signal impedance, a low output signal impedance, and good following performance. The first switch module uses the MUX36D04 chip, which has a low input impedance, a high output impedance, and low error. The first operational amplifier module uses the OPA2192 operational amplifier chip, which has good following performance.

[0049] like Figure 5-8 as well as Figure 18 As shown, the signal for the second signal unit in the test interface is:

[0050] The -15 to 50V square wave signal in the second signal unit is followed by the voltage follower module. Then, the signal is switched by the second switch module to select one of the signals. The signal then flows to the second buffer circuit 1 in the second operational amplifier module, and then enters the two-stage operational amplifier circuit composed of operational amplifier chip U21, operational amplifier chip U22, resistor R21, resistor R22, resistor R23, and resistor R24. The -15 to 50V signal is inverted twice, the level is boosted, and finally it is reduced to a 0 to 3.3V square wave signal that can be processed and recognized by the main control module. This square wave signal then passes through the second square wave signal acquisition module and is divided into two paths. One path is a periodic signal T, which is captured periodically by the TI MM I NG port in the main control module. The other path is a square wave signal, which is connected to the ADC port in the main control module. The main control module processes this signal.

[0051] The second voltage follower module uses the OPA2192 operational amplifier chip, which has a high input signal impedance, a low output signal impedance, and good following performance. The second switch module uses the MUX36D04 chip, which has a low input impedance, a high output impedance, and low error. The second buffer circuit 1 uses the OP2192 chip; and both operational amplifier chips U21 and U22 use the OPA2625 operational amplifier chip.

[0052] like Figure 9-11 as well as Figure 19 As shown, for the signal of the third signal unit in the test interface:

[0053] The -15V to 0V negative power supply signal in the third signal unit is followed by the third voltage follower module, then switched by the third switch module, and then flows into the third buffer circuit 2. Next, it enters the third operational amplifier module. The chip U31, resistor R31, and resistor R32 in the third operational amplifier module invert, boost, and reduce the amplitude of the signal to obtain a 0-3.3V DC signal that the microcontroller can recognize. Then, it communicates with the main control module via IIC, and the main control module processes the signal.

[0054] The third voltage follower module uses the OPA2192 operational amplifier chip, which has a high input signal impedance, a low output signal impedance, and good following performance. The third switch module uses the MUX36D04 chip, which has a low input impedance, a high output impedance, and low error. The third buffer circuit 2 uses the OP2192 chip, which is more adaptable to voltages from -15V to 0V; the third operational amplifier module uses the OPA2625 operational amplifier chip, while U31 uses the OPA2625 operational amplifier chip.

[0055] like Figure 11-13 as well as Figure 19 As shown, for the signal of the fourth signal unit in the test interface:

[0056] The 0-50V positive power supply signal in the fourth signal unit is followed by the fourth voltage follower module, then switched by the fourth switch module, and then flows into the fourth buffer circuit 3. Next, it enters the fourth operational amplifier module, which inverts, upscales, and reduces the amplitude of the signal to obtain a 0-3.3V DC signal that the microcontroller can recognize. Then, it communicates with the main control module via IIC, and the main control module processes the signal.

[0057] The fourth voltage follower module uses the OPA2376 operational amplifier chip, which has a high input signal impedance, a low output signal impedance, and good following performance. The fourth switch module uses the MUX36D04 chip, which has a low input impedance, a high output impedance, and low error. The fourth buffer circuit 3 uses the OP2376 chip, which is more adaptable to voltages from 0 to 50V; the fourth operational amplifier module uses the OPA2625 operational amplifier chip, while U41 uses the OPA2625 operational amplifier chip.

[0058] like Figure 14-16 as well as Figure 19 As shown, for the signal of the fifth signal unit in the test interface:

[0059] The 0-3.3V positive power supply signal in the fifth signal unit is followed by the fifth voltage follower module, then switched by the fifth switch module, and then enters the fifth operational amplifier module. The fifth operational amplifier module follows the signal and then communicates with the main control module via IIC. The main control module processes the signal.

[0060] The fifth voltage follower module uses the OPA2376 operational amplifier chip, which has a high input signal impedance, a low output signal impedance, and good following performance. The fifth switch module uses the MUX36D04 chip, which has a low input impedance, a high output impedance, and low error. The fifth operational amplifier module uses the OPA2376 operational amplifier chip.

[0061] like Figure 4 , 8 As shown in this embodiment, a TV board TCONLESS screen drive signal testing device is provided, wherein a first square wave acquisition module is electrically connected between the first operational amplifier module and the main control module; and a second square wave acquisition module is electrically connected between the second operational amplifier module and the main control module.

[0062] like Figure 1-19As shown in this embodiment, a TV board TCONLESS screen driver signal testing device is provided, wherein a first voltage follower module is provided between the first signal unit and the first switch module; a second voltage follower module is provided between the second signal unit and the second switch module; a third voltage follower module is provided between the third signal unit and the third switch module; a fourth voltage follower module is provided between the fourth signal unit and the fourth switch module; and a fifth voltage follower module is provided between the fifth signal unit and the fifth switch module.

[0063] Each voltage follower module uses an operational amplifier chip adapted to its signal voltage and current. The difference is that for different types of signals, the external circuit of the operational amplifier chip filters out the remaining noise by changing its filter network composed of resistors and capacitors.

[0064] like Figure 7 As shown in this embodiment, a TV board TCONLESS screen drive signal testing device includes a second operational amplifier module comprising a second up-amplifier circuit and a second down-amplifier circuit; the output terminal of the second switch module is electrically connected to the input terminal of the second up-amplifier circuit; the output terminal of the second up-amplifier circuit is electrically connected to the input terminal of the second down-amplifier circuit; and the output terminal of the second down-amplifier circuit is electrically connected to the main control module.

[0065] like Figure 7 As shown in this embodiment, a TV board TCONLESS screen drive signal testing device is provided with a second buffer circuit 1 between the output terminal of the second switch module and the input terminal of the second up-up circuit.

[0066] like Figure 7 As shown in this embodiment, a TV board TCONLESS screen drive signal testing device includes a second up-amplifier circuit comprising an operational amplifier chip U21; a second down-amplifier circuit comprising an operational amplifier chip U22; the inverting input terminal of the operational amplifier chip U21 is electrically connected to the output terminal of the second switching module via a resistor R21; the non-inverting input terminal of the operational amplifier chip U21 is electrically connected to a first reference voltage Vreg; a resistor R22 is provided between the inverting input terminal and the output terminal of the operational amplifier chip U21; the output terminal of the operational amplifier chip U21 is electrically connected to the inverting input terminal of the operational amplifier chip U22 via a resistor R23; the non-inverting input terminal of the operational amplifier chip U22 is electrically connected to a second reference voltage Vr; a resistor R24 ​​is provided between the inverting input terminal and the output terminal of the operational amplifier chip U22; and the output terminal of the operational amplifier chip U22 is electrically connected to the main control module.

[0067] like Figure 11As shown in this embodiment, a TV board TCONLESS screen drive signal testing device includes a third operational amplifier module comprising an operational amplifier chip U31. The output terminal of the third switching module is connected to the inverting input terminal of the operational amplifier chip U31 via a resistor R31. The non-inverting input terminal of the operational amplifier chip U31 is electrically connected to a third reference voltage Vr3. The inverting input terminal of the operational amplifier chip U31 is electrically connected to the output terminal of the operational amplifier chip U31 via a resistor R32. The output terminal of the operational amplifier chip U31 is electrically connected to the main control module via a resistor R33.

[0068] The fourth operational amplifier module includes an operational amplifier chip U41; the output terminal of the fourth switching module is connected to the inverting input terminal of the operational amplifier chip U41 via resistor R41; the non-inverting input terminal of the operational amplifier chip U41 is electrically connected to the fourth reference voltage Vr4; the inverting input terminal of the operational amplifier chip U41 is electrically connected to the output terminal of the operational amplifier chip U41 via resistor R42; and the output terminal of the operational amplifier chip U41 is electrically connected to the main control module via resistor R43.

[0069] like Figure 3 As shown in this embodiment, a TV board TCONLESS screen drive signal testing device includes an operational amplifier module comprising an operational amplifier chip U11; the non-inverting input terminal of the operational amplifier chip U11 is electrically connected to the output terminal of the first switching module; the inverting input terminal of the operational amplifier chip U11 is electrically connected to the output terminal of the operational amplifier chip U11; and the output terminal of the operational amplifier chip U11 is electrically connected to the main control module.

[0070] The fifth operational amplifier module includes an operational amplifier chip U51; the output terminal of the fifth switching module is connected to the inverting input terminal of the operational amplifier chip U51 via a resistor R51; the non-inverting input terminal of the operational amplifier chip U51 is electrically connected to the first reference voltage; the inverting input terminal of the operational amplifier chip U51 is electrically connected to the output terminal of the operational amplifier chip U51 via a resistor R52; and the output terminal of the operational amplifier chip U51 is electrically connected to the main control module via a resistor R53.

[0071] like Figure 1-19 As shown in this embodiment, a TV board TCONLESS screen drive signal testing device is provided, wherein a third buffer circuit 2 is provided between the third switch module and the third operational amplifier module; and a fourth buffer circuit 3 is provided between the fourth switch module and the fourth operational amplifier module.

[0072] The above description is only a preferred embodiment of the present utility model. Therefore, any equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included within the protection scope of the present utility model patent application.

Claims

1. A TV board card (TCONLESS) screen driving signal testing device, characterized in that: The test interface and the main control module are included. The test interface includes a first signal unit, a second signal unit, a third signal unit, a fourth signal unit and a fifth signal unit. The first signal unit is used for electrical connection with 0-3.3V square wave signals on an external TV board. The second signal unit is used for electrical connection with -15-50V square wave signals on the external TV board. The third signal unit is used for electrical connection with -15-0V negative power signals on the external TV board. The fourth signal unit is used for electrical connection with 0-50V positive power signals on the external TV board. The fifth signal unit is used for electrical connection with 0-3.3V power signals on the external TV board. The first signal unit is electrically connected with the main control module through a first switch module and a first operational amplifier module; the second signal unit is electrically connected with the main control module through a second switch module and a second operational amplifier module; the third signal unit is electrically connected with the main control module through a third switch module and a third operational amplifier module; the fourth signal unit is electrically connected with the main control module through a fourth switch module, a fourth operational amplifier module; and the fifth signal unit is electrically connected with the main control module through a fifth switch module and a fifth operational amplifier module.

2. The TV board TCONLESS screen driving signal testing device according to claim 1, characterized in that: A first square wave collection module is electrically connected between the first operational amplifier module and the main control module; and a second square wave collection module is electrically connected between the second operational amplifier module and the main control module.

3. The TV board TCONLESS screen driving signal testing device according to claim 1, characterized in that: A first voltage follower module is arranged between the first signal unit and the first switch module; a second voltage follower module is arranged between the second signal unit and the second switch module; a third voltage follower module is arranged between the third signal unit and the third switch module; a fourth voltage follower module is arranged between the fourth signal unit and the fourth switch module; and a fifth voltage follower module is arranged between the fifth signal unit and the fifth switch module.

4. The TV board TCON-less screen driving signal testing device according to claim 1, characterized in that: The second operational amplifier module includes a second up circuit and a second down circuit; an output end of the second switch module is electrically connected with an input end of the second up circuit; an output end of the second up circuit is electrically connected with an input end of the second down circuit; and an output end of the second down circuit is electrically connected with the main control module.

5. The TV board TCON-less screen driving signal testing device according to claim 4, characterized in that: A second buffer circuit (1) is arranged between the output end of the second switch module and the input end of the second up circuit.

6. The TV board TCONLESS screen driving signal testing device according to claim 4, characterized in that: The second up circuit includes an operational amplifier chip U21; and the second down circuit includes an operational amplifier chip U22. An inverting input end of the operational amplifier chip U21 is electrically connected with the output end of the second switch module through a resistor R21; a non-inverting input end of the operational amplifier chip U21 is electrically connected with a first reference voltage Vreg; and a resistor R22 is arranged between the inverting input end of the operational amplifier chip U21 and an output end of the operational amplifier chip U21. The output end of the operational amplifier chip U21 is electrically connected with the inverting input end of the operational amplifier chip U22 through the resistor R23; the non-inverting input end of the operational amplifier chip U22 is electrically connected with the second reference voltage Vr; the inverting input end of the operational amplifier chip U22 is electrically connected with the output end of the operational amplifier chip U22 through the resistor R24; The output end of the operational amplifier chip U22 is electrically connected with the main control module.

7. The TV board TCON-less screen driving signal testing device according to claim 1, wherein: The third operational amplifier module comprises an operational amplifier chip U31; the output end of the third switch module is connected with the inverting input end of the operational amplifier chip U31 after passing through the resistor R31; the non-inverting input end of the operational amplifier chip U31 is electrically connected with the third reference voltage Vr3; the inverting input end of the operational amplifier chip U31 is electrically connected with the output end of the operational amplifier chip U31 through the resistor R32; the output end of the operational amplifier chip U31 is electrically connected with the main control module through the resistor R33; The fourth operational amplifier module comprises an operational amplifier chip U41; the output end of the fourth switch module is connected with the inverting input end of the operational amplifier chip U41 after passing through the resistor R41; the non-inverting input end of the operational amplifier chip U41 is electrically connected with the fourth reference voltage Vr4; the inverting input end of the operational amplifier chip U41 is electrically connected with the output end of the operational amplifier chip U41 through the resistor R42; the output end of the operational amplifier chip U41 is electrically connected with the main control module through the resistor R43.

8. The TV board TCONLESS screen drive signal testing device according to claim 1, characterized in that: The operational amplifier module comprises an operational amplifier chip U11; the non-inverting input end of the operational amplifier chip U11 is electrically connected with the output end of the first switch module; the inverting input end of the operational amplifier chip U11 is electrically connected with the output end of the operational amplifier chip U11; the output end of the operational amplifier chip U11 is electrically connected with the main control module; The fifth operational amplifier module comprises an operational amplifier chip U51; the output end of the fifth switch module is connected with the inverting input end of the operational amplifier chip U51 after passing through the resistor R51; the non-inverting input end of the operational amplifier chip U51 is electrically connected with the first reference voltage; the inverting input end of the operational amplifier chip U51 is electrically connected with the output end of the operational amplifier chip U51 through the resistor R52; the output end of the operational amplifier chip U51 is electrically connected with the main control module through the resistor R53.

9. The TV board TCONLESS screen driving signal testing device according to claim 1, characterized in that: The third buffer circuit (2) is arranged between the third switch module and the third operational amplifier module; the fourth buffer circuit (3) is arranged between the fourth switch module and the fourth operational amplifier module.

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