Display screen control circuit board circuit

Abstract

The utility model relates to the technical field of display screen control, and discloses a circuit of a display screen control circuit board, which is characterized in that all layers of DC 12V input seats (a wire holder J1 and a wire holder J27) of a power supply input circuit are prohibited from being coated with ground copper during copper coating of a PCB (Printed Circuit Board), the distance is more than 1mm, a main power supply is separated from other circuits, large-area burning of a mainboard is avoided, and the service life of the mainboard is prolonged. The negative electrode of the DC base is grounded to the main ground only through two packaged R1210 / 0R resistors, the effects of EMI radiation and ESD protection are achieved, the positive electrode of the DC base passes through a packaged R1210 / 0R resistor and then a resettable fuse, the effects of overvoltage and overcurrent protection, EMI radiation and ESD protection are achieved, and then the risk that a display screen is burnt out in the testing or running process is reduced; through the design of the plum-blossom-shaped packaging seat, after solder paste is applied, the packaging seat protrudes by 0.2 mm, the packaging seat can be fully grounded, heat dissipation, ESD protection and EMI radiation protection are facilitated, screw slipping is prevented, and a PCB copper sheet is prevented from falling off during screw driving.

Description

Technical Field

[0001] The utility model relates to the technical field of display screen control, and particularly relates to a display screen control circuit board circuit. Background Art

[0002] Display screen control refers to the process of managing and adjusting the display content, display mode, display effect, etc. of a display screen through specific hardware devices and software programs. This includes, but is not limited to, the display of multimedia content such as text, pictures, videos, animations, etc., and the adjustment of display parameters such as brightness, contrast, color temperature, etc.

[0003] After retrieval, a patent with the application number CN201921481338.8 discloses a display screen control circuit, belonging to the field of display screen control circuits. This control circuit uses a constant current drive chip TM1926C and an LED array circuit. The LED array circuit includes LED Lamp I, LED Lamp II, LED Lamp III, and LED Lamp IV; the common anode terminal of the LED array circuit is connected to the power supply terminal; the VDD pin of the constant current drive chip is connected to the power supply terminal, the DO pin is connected to resistor R39, and the DIN pin is connected to resistor R31; a capacitor C1 is connected in series between the GND pin and the power supply terminal; this utility model adopts a single-wire communication method, and there are no cross wires for the input and output of signals, and single-layer board wiring can be used. On the one hand, it makes the wiring simple and clear, reducing the error rate. On the other hand, using a single-layer substrate saves the total R & D cost of the product, saves the internal space of the product, reduces the wire usage, and the circuit performance is excellent, stable and reliable.

[0004] The current display screen control circuit board lacks a safety protection circuit (overcurrent, overvoltage, anti-breakdown, etc.), and there is a risk of burning out during the test or operation of the display screen. Moreover, when installing the display screen control circuit board, the installation holes opened on it are relatively conventional (the height of the installation hole is the same as that of the PCB board). When screwing in the screws, the rotation of the screws will cause the copper foil on the PCB board to fall off, and there is also a phenomenon of screw slippage. Therefore, we need to propose a display screen control circuit board circuit. Content of the Utility Model

[0005] The purpose of the present utility model is to provide a display control circuit board circuit. Through the DC12V input socket (connection sockets J1 and J27) of the power input circuit, all layers are prohibited from covering the ground copper during PCB copper cladding, with a spacing of more than 1 mm, separating the main power supply from other circuits, preventing large-area burning of the main board. Moreover, the negative pole of the DC socket is connected to the main ground through two packaged R1210 / 0R resistors, playing a role in EMI radiation and ESD protection. The positive pole of the DC socket passes through a packaged R1210 / 0R resistor and then through a self-recovery fuse, playing a role in overvoltage, overcurrent protection, EMI radiation, and ESD protection, thereby reducing the risk of burning during the testing or operation of the display. Through the design of the plum blossom-shaped packaging socket, after applying solder paste, it will protrude 0.2 mm in height, which can fully ground, is conducive to heat dissipation, ESD protection, EMI radiation protection, preventing screw slipping, and preventing PCB copper skin from falling off when screwing, so as to solve the problems raised in the above background technology.

[0006] To achieve the above purpose, the present utility model provides the following technical solutions: It includes a graphics processor, a synchronous buck converter, a debugging serial port connected to the graphics processor, a liquid crystal display chip, a USB interface one, a USB interface two, an EDP connector, a memory card, a wireless connection module, a volume adjustment button, a storage chip one, a storage chip two, and a USB interface three. The synchronous buck converter is connected to the graphics processor, and a display screen is connected to the liquid crystal display chip;

[0007] It also includes a power adapter, a self-recovery fuse, and a DC / DC converter connected in sequence. The DC / DC converter is connected to the synchronous buck converter;

[0008] On the main board inside the power adapter, there is a power input circuit that inputs a 12V DC voltage and a maximum current of 3A into the circuit, and plays a role in overcurrent protection, overvoltage protection, EMI radiation, and ESD protection;

[0009] On the main board inside the DC / DC converter, there is a power supply circuit that provides a 3.3V power supply voltage to the circuit;

[0010] On the main board inside the synchronous buck converter, there are respectively provided:

[0011] A voltage conversion circuit for converting the input voltage into a stable output DC voltage;

[0012] A voltage stabilization circuit that provides a stable voltage output when the voltage difference between the input and output voltages is small;

[0013] A power management circuit;

[0014] An audio codec circuit for performing analog-to-digital conversion and digital-to-analog conversion on the audio signal of the display screen;

[0015] The power supply circuit is electrically connected to the voltage conversion circuit, the voltage stabilization circuit, and the power management circuit respectively. The power input circuit is electrically connected to the power management circuit, and the power input circuit is electrically connected to the power supply circuit.

[0016] Preferably, the power input circuit includes a terminal block J1, a terminal block J27, and a common mode inductor L26. A self - resetting fuse R41 is connected between pin 1 of the terminal block J1 and pin 4 of the terminal block J27. A resistor R42 is connected between pin 2 of the terminal block J1 and pin 3 of the terminal block J27. The self - resetting fuse R41 is connected to one winding of the common mode inductor L26, and the resistor R42 is connected to the other winding of the common mode inductor L26;

[0017] A resistor R20 is connected in parallel to one winding of the common mode inductor L26, and a resistor R334 is connected in parallel to the other winding of the common mode inductor L26. One winding of the common mode inductor L26 is respectively connected to a resistor R333, capacitors C92, C93, C94, C424, and one end of the resistor R333 is connected to a capacitor C425.

[0018] Preferably, the power supply circuit includes a chip U2. A resistor R45 is connected between pin 4 and pin 5 of the chip U2. A resistor R48 and a capacitor C101 grounded are respectively connected to pin 4 of the chip U2. Capacitors C96 and C97 grounded are respectively connected to pin 5 of the chip U2, and pin 5 of the chip U2 is connected to the common mode inductor L26;

[0019] A capacitor C95 is connected between pin 1 and pin 6 of the chip U2. An inductor L2 and a capacitor C98 are connected between pin 3 and pin 6 of the chip U2. A resistor R46 is connected in parallel to the capacitor C98. One end of the resistor R46 is respectively connected to capacitors C221, C414, C99, C100, a resistor R17, and a capacitor C102 grounded.

[0020] Preferably, the voltage conversion circuit includes a chip U5A. One end of the inductor L2 is connected to pins 10, 11, 24, and 66 of the chip U5A. An inductor L7 is connected to pin 9 of the chip U5A. A capacitor C141 and a resistor R65 are connected in parallel between pin 8 of the chip U5A and the inductor L7.

[0021] Preferably, the voltage stabilizing circuit includes chip U5B. One end of inductor L2 is connected to pins 22, 30, 4, 57, and 54 of chip U5B. An inductor L9 and a resistor R68 are connected between pin 53 and pin 59 of chip U5B. Capacitors C148 and C149 connected to ground are connected to the connection terminals of inductor L9 and resistor R68, and the connection terminals of inductor L9 and resistor R68 are connected to a 1.8V power supply voltage. A resistor R69 connected to ground is also connected to pin 59 of chip U5B.

[0022] Preferably, the power management circuit includes chip U5C. Inductor L2 is connected to pin 45 of chip U5C. A crystal oscillator Y2 is connected between pin 50 and pin 51 of chip U5C. Capacitors C159 and C161 are respectively connected to both ends of crystal oscillator Y2. Capacitor C168, resistor R70, and resistor R73 are respectively connected to pin 61 of chip U5C. Resistor R70 is connected to inductor L26.

[0023] Preferably, the audio codec circuit includes chip U5D. A capacitor C152 is connected between pins 36 and 37 of chip U5D. A capacitor C156 is connected to pin 38 of chip U5D. A capacitor C157 is connected to pin 35 of chip U5D. A capacitor C158 is connected to pin 48 of chip U5D. A capacitor C160 is connected to pin 44 of chip U5D. A capacitor C153 is connected to pin 40 of chip U5D. Capacitors C163 and C165 are respectively connected to pin 42 of chip U5D. Capacitors C162 and C164 are respectively connected to pin 43 of chip U5D.

[0024] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0025] 1. In the present utility model, all layers are prohibited from covering ground copper during PCB copper cladding for the DC12V input socket (connection sockets J1 and J27) of the power input circuit, with a spacing of more than 1 mm, separating the main power supply from other circuits and preventing large-area burning of the main board.

[0026] 2. The negative pole of the DC socket in the present utility model reaches the main ground through two R1210 / 0R resistors in packages, playing the role of EMI radiation and ESD protection. The positive pole of the DC socket passes through an R1210 / 0R resistor in a package and then through a self-resetting fuse, playing the role of overvoltage, overcurrent protection, EMI radiation, and ESD protection, thereby reducing the risk of burning during the test or operation of the display screen.

[0027] 3. Through the design of the plum-blossom-shaped encapsulation base, after applying solder paste, it will protrude 0.2 mm in height, which can fully ground, facilitate heat dissipation, provide ESD protection, EMI radiation protection, prevent screw slipping, and prevent the PCB copper foil from falling off when screwing. Description of the Drawings

[0028] Figure 1 is the circuit diagram of the power input circuit of the present utility model;

[0029] Figure 2 is the circuit diagram of the power supply circuit of the present utility model;

[0030] Figure 3 is the circuit diagram of the voltage conversion circuit of the present utility model;

[0031] Figure 4 is the circuit diagram of the voltage stabilization circuit of the present utility model;

[0032] Figure 5 is the circuit diagram of the power management circuit of the present utility model;

[0033] Figure 6 is the circuit diagram of the audio codec circuit of the present utility model;

[0034] Figure 7 is the schematic diagram of the display control circuit board of the present utility model;

[0035] Figure 8 is the schematic diagram of the plum-blossom-shaped encapsulation base of the present utility model;

[0036] Figure 9 is the structural block diagram of the present utility model. Detailed Embodiment

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0038] Please refer to Figures 1-9, the present utility model provides a technical solution: a display control circuit board circuit, including a graphics processor 1, a synchronous buck converter 8, a debugging serial port 2 connected to the graphics processor 1, a liquid crystal display chip 3, a USB interface one 16, a USB interface two 17, an EDP connector 18, a memory card 19, a wireless connection module 20, a volume adjustment button 21, a memory chip one 22, a memory chip two 23, a USB interface three 24, the synchronous buck converter 8 is connected to the graphics processor 1, and a display screen 4 is connected to the liquid crystal display chip 3;

[0039] It further includes a power adapter 5, a self - reset fuse 6, and a DC / DC converter 7 connected in sequence, and the DC / DC converter 7 is connected to the synchronous buck converter 8;

[0040] A power switch 10, a dual - power amplifier driver chip 11, a headphone 13, and a virtual audio device 14 are respectively connected to the synchronous buck converter 8, and two loudspeakers 12 are connected to the dual - power amplifier driver chip 11. A crystal oscillator one 9 is also connected to the synchronous buck converter 8, and a crystal oscillator two 15 is also connected to the graphics processor 1.

[0041] On the main board inside the power adapter 5, there is a power input circuit that inputs a 12V DC voltage and a maximum current of 3A into the circuit, and provides over - current protection, over - voltage protection, EMI radiation, and ESD protection;

[0042] The power input circuit includes a terminal block J1, a terminal block J27, and a common - mode inductor L26. A self - reset fuse R41 is connected between pin 1 of the terminal block J1 and pin 4 of the terminal block J27, a resistor R42 is connected between pin 2 of the terminal block J1 and pin 3 of the terminal block J27. The self - reset fuse R41 is connected to one winding of the common - mode inductor L26, and the resistor R42 is connected to the other winding of the common - mode inductor L26;

[0043] Pin 3 and pin 4 of the terminal block J1 are connected, and pin 2, pin 5, and pin 6 of the terminal block J27 are connected.

[0044] A resistor R20 is connected in parallel to one winding of the common - mode inductor L26, a resistor R334 is connected in parallel to the other winding of the common - mode inductor L26. One winding of the common - mode inductor L26 is respectively connected to a resistor R333, capacitors C92, C93, C94, C424, and one end of the resistor R333 is connected to a capacitor C425.

[0045] For the DC12V input socket terminal blocks J1 and J27 of the power input circuit, all layers are prohibited from covering the ground copper during PCB copper plating, and the spacing is more than 1mm.

[0046] The negative pole of the DC socket reaches the main ground through two encapsulated R1210 / 0R resistors, playing the role of EMI radiation and ESD protection.

[0047] The positive pole of the DC socket passes through an encapsulated R1210 / 0R resistor and then through a self - resetting fuse, playing the role of over - voltage protection, over - current protection, EMI radiation and ESD protection.

[0048] On the main board inside the DC / DC converter 7, a power supply circuit for providing a 3.3V supply voltage to the circuit is provided;

[0049] The power supply circuit includes a chip U2. A resistor R45 is connected between the 4th and 5th pins of the chip U2. A grounded resistor R48 and a capacitor C101 are respectively connected to the 4th pin of the chip U2. A grounded capacitor C96 and a capacitor C97 are respectively connected to the 5th pin of the chip U2. And the 5th pin of the chip U2 is connected to a common - mode inductor L26;

[0050] A capacitor C95 is connected between the 1st and 6th pins of the chip U2. An inductor L2 and a capacitor C98 are connected between the 3rd and 6th pins of the chip U2. A resistor R46 is connected in parallel with the capacitor C98. One end of the resistor R46 is respectively connected to grounded capacitors C221, C414, C99, C100, a resistor R17, and a capacitor C102.

[0051] The 2nd pin of the chip U2 is grounded, and a grounded resistor R49 is connected to the connection terminal of the capacitor C98 and the resistor R46 that is far from the inductor L2.

[0052] On the main board inside the synchronous buck converter 8, the following are respectively provided:

[0053] A voltage conversion circuit for converting the input voltage into a stable output DC voltage;

[0054] The voltage conversion circuit includes a chip U5A. One end of the inductor L2 is connected to the 10th, 11th, 24th, and 66th pins of the chip U5A. An inductor L7 is connected to the 9th pin of the chip U5A. A capacitor C141 and a resistor R65 are connected in parallel between the 8th pin of the chip U5A and the inductor L7. One end of the inductor L7 is also respectively connected to grounded capacitors C142 and C143.

[0055] An inductor L5 is connected to the 12th pin of the chip U5A. A capacitor C129 and a resistor R63 are connected in parallel between the 13th pin of the chip U5A and the inductor L5. And one end of the inductor L5 is respectively connected to grounded capacitors C130 and C131;

[0056] A capacitor C124 connected to ground is connected to pin 11 of chip U5A, a capacitor C125 connected to ground is connected to pin 66 of chip U5A, an inductor L6 is connected to pin 65 of chip U5A, a resistor R64 and a capacitor C134 are connected in parallel between the inductor L6 and pin 64 of chip U5A, and one end of the inductor L6 is respectively connected to a capacitor C132 and a capacitor C133 connected to ground;

[0057] A capacitor C138 connected to ground is connected to pin 24 of chip U5A, an inductor L8 is connected between pins 25 and 26 of chip U5A, and one end of the inductor L8 is respectively connected to a capacitor C144 and a capacitor C145 connected to ground; and a resistor R66 is connected between pins 26 and 27 of chip U5A, and a resistor R67 connected to ground is connected to pin 27 of chip U5A.

[0058] A voltage stabilizing circuit that provides a stable voltage output in the case of a small differential voltage between the input and output voltages;

[0059] The voltage stabilizing circuit includes a chip U5B. One end of the inductor L2 is connected to pins 22, 30, 4, 57, and 54 of the chip U5B. An inductor L9 and a resistor R68 are connected between pins 53 and 59 of the chip U5B. Capacitors C148 and C149 connected to ground are connected to the connection terminals of the inductor L9 and the resistor R68, and the connection terminals of the inductor L9 and the resistor R68 are connected to a 1.8V supply voltage. A resistor R69 connected to ground is also connected to pin 59 of the chip U5B.

[0060] A capacitor C119 connected to ground is connected to pin 23 of chip U5B, a capacitor C121 connected to ground is connected to pin 21 of chip U5B, a capacitor C122 connected to ground is connected to pin 20 of chip U5B, a capacitor C123 connected to ground is connected to pin 28 of chip U5B, a capacitor C127 connected to ground is connected to pin 29 of chip U5B, a capacitor C128 connected to ground is connected to pin 31 of chip U5B, a capacitor C135 connected to ground is connected to pin 3 of chip U5B, a capacitor C137 connected to ground is connected to pin 5 of chip U5B, a capacitor C139 connected to ground is connected to pin 6 of chip U5B, a capacitor C140 connected to ground is connected to pin 58 of chip U5B, and a capacitor C147 connected to ground is connected to pin 55 of chip U5B.

[0061] A power management circuit;

[0062] The power management circuit includes a chip U5C. The inductor L2 is connected to pin 45 of the chip U5C. A crystal oscillator Y2 is connected between pins 50 and 51 of the chip U5C. Capacitors C159 and C161 are respectively connected to both ends of the crystal oscillator Y2. A capacitor C168, a resistor R70, and a resistor R73 are respectively connected to pin 61 of the chip U5C. The resistor R70 is connected to the inductor L26.

[0063] A capacitor C154 connected to ground is connected to pin 46 of chip U5C. A resistor R72 and a resistor R71 are sequentially connected to pin 68 of chip U5C. A capacitor C166 and a resistor R74 are respectively connected to pin 67 of chip U5C. A capacitor C155 connected to ground is connected to pin 45 of chip U5C. A capacitor C167 connected to ground is connected to pin 52 of chip U5C.

[0064] An audio codec circuit for performing analog-to-digital conversion and digital-to-analog conversion on the audio signal of the display screen;

[0065] The audio codec circuit includes a chip U5D. A capacitor C152 is connected between pin 36 and pin 37 of the chip U5D. A capacitor C156 is connected to pin 38 of the chip U5D. A capacitor C157 is connected to pin 35 of the chip U5D. A capacitor C158 is connected to pin 48 of the chip U5D. A capacitor C160 is connected to pin 44 of the chip U5D. A capacitor C153 is connected to pin 40 of the chip U5D. A capacitor C163 and a capacitor C165 are respectively connected to pin 42 of the chip U5D. A capacitor C162 and a capacitor C164 are respectively connected to pin 43 of the chip U5D.

[0066] A ferrite bead FB1 and a capacitor C151 are respectively connected to pin 33 of chip U5D.

[0067] The power supply circuit is respectively electrically connected to the voltage conversion circuit, the voltage stabilization circuit, and the power management circuit. The power input circuit is electrically connected to the power management circuit. The power input circuit is electrically connected to the power supply circuit.

[0068] As Figure 8 shown, a plum blossom-shaped package base for applying solder paste is further provided on the circuit board. After applying the solder paste, it will protrude 0.2 mm in height, which can be fully grounded, is beneficial to heat dissipation, ESD protection, EMI radiation protection, prevent screw slipping, prevent PCB copper foil from falling off when screwing, etc.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A display screen control circuit board circuit, characterized in that: The device comprises a graphics processor (1), a synchronous buck converter (8), a debugging serial port (2) connected to the graphics processor (1), a liquid crystal screen chip (3), a USB interface 1 (16), a USB interface 2 (17), an EDP connector (18), a memory card (19), a wireless connection module (20), a volume adjustment button (21), a memory chip 1 (22), a memory chip 2 (23), and a USB interface 3 (24); the synchronous buck converter (8) is connected to the graphics processor (1), and the liquid crystal screen chip (3) is connected to a display screen (4); It also includes a power adapter (5), a resettable fuse (6), and a DC / DC converter (7) which are connected in sequence, and the DC / DC converter (7) is connected to a synchronous buck converter (8); The main board inside the power adapter (5) is provided with a power input circuit which inputs a 12V DC voltage and a maximum current of 3A into the circuit and performs overcurrent protection, overvoltage protection, EMI radiation, and ESD protection; A power supply circuit for providing a 3.3V power supply voltage to the circuit is provided on the main board inside the DC / DC converter (7); The main board inside the synchronous buck converter (8) is respectively provided with: A voltage conversion circuit for converting an input voltage into a stable output DC voltage; A voltage stabilizing circuit that provides a stable voltage output when the input and output voltage difference is small; Power management circuit; An audio codec circuit for performing analog-to-digital conversion and digital-to-analog conversion on the audio signal of the display screen; The power supply circuit is electrically connected to the voltage conversion circuit, the voltage stabilization circuit, and the power management circuit respectively, the power input circuit is electrically connected to the power management circuit, and the power input circuit is electrically connected to the power supply circuit.

2. A display screen control circuit board circuit according to claim 1, characterized in that: The power input circuit includes a terminal block J1, a terminal block J27, and a common mode inductor L26. A resettable fuse R41 is connected to pin 1 of the terminal block J1 and pin 4 of the terminal block J27. A resistor R42 is connected to pin 2 of the terminal block J1 and pin 3 of the terminal block J27. The resettable fuse R41 is connected to one winding of the common mode inductor L26, and the resistor R42 is connected to another winding of the common mode inductor L26. A resistor R20 is connected in parallel to one winding of the common-mode inductor L26, a resistor R334 is connected in parallel to another winding of the common-mode inductor L26, a resistor R333, a capacitor C92, a capacitor C93, a capacitor C94, and a capacitor C424 are respectively connected to one winding of the common-mode inductor L26, and one end of the resistor R333 is connected to a capacitor C425.

3. A display screen control circuit board circuit according to claim 2, characterized in that: The power supply circuit includes a chip U2, a resistor R45 is connected between pins 4 and 5 of the chip U2, and pins 4 of the chip U2 are respectively connected to a grounded resistor R48 and a capacitor C101, and pins 5 of the chip U2 are respectively connected to grounded capacitors C96 and C97, and pin 5 of the chip U2 is connected to a common mode inductor L26; A capacitor C95 is connected between pin 1 and pin 6 of the chip U2, an inductor L2 and a capacitor C98 are connected between pin 3 and pin 6 of the chip U2, a resistor R46 is connected in parallel to the capacitor C98, and one end of the resistor R46 is respectively connected to a grounded capacitor C221, a capacitor C414, a capacitor C99, a capacitor C100, a resistor R17, and a capacitor C102.

4. A display screen control circuit board circuit according to claim 3, characterized in that: The voltage conversion circuit includes a chip U5A, one end of the inductor L2 is connected to pins 10, 11, 24 and 66 of the chip U5A, pin 9 of the chip U5A is connected to the inductor L7, and a capacitor C141 and a resistor R65 are connected in parallel between pin 8 of the chip U5A and the inductor L7.

5. A display screen control circuit board circuit according to claim 4, characterized in that: The voltage stabilizing circuit includes a chip U5B, one end of the inductor L2 is connected to pins 22, 30, 4, 57, and 54 of the chip U5B, an inductor L9 and a resistor R68 are connected between pins 53 and 59 of the chip U5B, the wiring terminals of the inductor L9 and the resistor R68 are connected to grounded capacitors C148 and C149, and the wiring terminals of the inductor L9 and the resistor R68 are connected to a 1.8V power supply voltage, and a grounded resistor R69 is also connected to pin 59 of the chip U5B.

6. A display screen control circuit board circuit according to claim 5, characterized in that: The power management circuit includes a chip U5C, the inductor L2 is connected to pin 45 of the chip U5C, a crystal oscillator Y2 is connected between pins 50 and 51 of the chip U5C, capacitors C159 and C161 are connected to both ends of the crystal oscillator Y2, capacitors C168, resistors R70 and R73 are connected to pin 61 of the chip U5C, and the resistor R70 is connected to the inductor L26.

7. The display screen control circuit board circuit according to claim 1, characterized in that: The audio codec circuit includes a chip U5D, a capacitor C152 is connected between pins 36 and 37 of the chip U5D, a capacitor C156 is connected to pin 38 of the chip U5D, a capacitor C157 is connected to pin 35 of the chip U5D, a capacitor C158 is connected to pin 48 of the chip U5D, a capacitor C160 is connected to pin 44 of the chip U5D, a capacitor C153 is connected to pin 40 of the chip U5D, a capacitor C163 and a capacitor C165 are respectively connected to pin 42 of the chip U5D, and a capacitor C162 and a capacitor C164 are respectively connected to pin 43 of the chip U5D.

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