CN103813162A - Television mainboard self-detection method and system - Google Patents

Abstract

The invention discloses a TV main board self-testing system, comprising: an original signal circuit of the interface, a self-testing signal circuit, a main control unit, and an external input source interface of the main board; the first end of the original signal circuit of the interface is connected to the external The input source interface pins are connected, and the second end is connected with the detection signal input end of the main control unit; when there is no signal line connected to the external input source interface of the main board, the self-detection signal circuit, the interface principle There is a signal circuit, and the main control unit forms a local loopback path. The present invention sends the interface detection signal by itself through the main chip of the main board of the TV, and then receives it by itself, compares and judges whether the signal transmission is abnormal, and then judges whether the interface function is normal, which not only completes the detection of the main board of the TV, but also reduces the purchase and access of external equipment, The maintenance cost and production cost are reduced, and at the same time, problems such as misoperation and poor connection caused by cumbersome operations are avoided.

Description

TV motherboard self-test method and system

technical field

The invention relates to the technical field of TV mainboard testing, in particular to a self-testing method and system for a TV mainboard.

Background technique

With the maturity of TV technology and the increasingly fierce competition in the same industry, improving production efficiency is an important way to reduce production costs and improve product quality. In the production process of TVs, it is usually necessary to test the quality of TVs to ensure that qualified products enter the market. In the prior art, the detection of TV quality is usually carried out to the whole machine, and it is necessary to use instruments to detect, which makes the detection process quite cumbersome. When there is a problem, the main board needs to be replaced. Therefore, it is necessary to develop a system that speeds up the board inspection and improves the accuracy of the board inspection, so that it can prevent unqualified products from flowing into the next process in the first process, and achieve a combination of prevention and control. .

The patent number is "201120344697.6", and the Chinese utility model patent titled "Quick Detection System for TV Main Board" discloses a fast detection system for TV main board, which includes a signal source module, an audio output module, a video output module and A detection control module, which uses the signal source module to generate standard signals, uses the audio output module to play the audio output from the main board to be tested, uses the video output module to display the video output from the main board to be tested, and uses the detection control module to control the detection process, It can improve the detection speed of the motherboard, effectively check the unqualified products, and improve the production capacity of the production line.

However, the operation of the above-mentioned rapid detection system for the main board of the TV requires external equipment as a signal input source and signal display equipment, which will increase maintenance investment and production costs; in addition, there will be defects such as poor connection and cumbersome operation when plugging external equipment.

Contents of the invention

The purpose of the present invention is to provide a TV motherboard self-testing method and system to solve the above-mentioned defects in the prior art.

For realizing the purpose of the present invention, the present invention provides a kind of TV motherboard self-testing system, comprising:

Interface original signal circuit, self-detection signal circuit, main control unit, main board external input source interface;

The first end of the original signal circuit of the interface is connected to the external input source interface pin of the main board, and the second end is connected to the detection signal input end of the main control unit;

When there is no signal line connected to the external input source interface of the main board, the pin at one end of the self-detection signal circuit is connected to the pin at the first end of the original signal circuit of the interface, and the external input source interface of the main board has When the signal line is connected, the pin at one end of the self-detection signal circuit is disconnected from the pin at the first end of the original signal circuit of the interface, and the other end of the self-detection signal circuit is connected to the main control unit. The detection signal output terminal is connected;

When no signal line is connected to the external input source interface of the motherboard, the self-detection signal circuit, the original signal circuit of the interface, and the main control unit form a local loopback (loopback) path.

Preferably, the external input source interface of the motherboard is a component interface, the component interface includes a video interface, the self-detection signal circuit includes a self-detection video signal circuit, the main control unit is a main chip of the motherboard; the video interface has no When the video component signal line is connected, the pin of the first end of the original signal circuit of the interface is connected to the video interface pin, and the second end is connected to the detection signal input pin of the main chip of the main board. The pin of one end of the self-detection video signal circuit is connected with the pin of the first end of the original signal circuit of the interface, and the other end is connected with the detection signal output pin of the main chip of the main board, the self-detection video signal circuit, The original signal circuit of the interface and the main chip of the motherboard form a local loopback (loopback) path.

Preferably, it also includes an earphone internal interface, the external input source interface of the main board is an audio interface, the main control unit is the main chip of the main board, and the self-detection signal circuit includes a self-detection audio signal circuit; the audio interface has no audio component When the signal line is connected, the pin at the first end of the original signal circuit of the interface is connected to the pin of the audio interface, and the pin at the second end is connected to the detection signal input pin of the main chip of the main board. One end of the self-detection audio signal circuit is connected to the pin of the first end of the original signal circuit of the interface, and the other end is connected to the internal interface pin of the earphone, and the internal interface pin of the earphone is connected to the main chip of the main board. The audio signal output pins are connected, and the original signal circuit of the interface, the main chip of the motherboard, the self-detection audio signal circuit, and the internal interface of the earphone form a local loopback (loopback) path.

Correspondingly, a kind of TV motherboard self-testing method, the interface on the mainboard is provided with self-testing signal circuit, described self-testing signal circuit, interface original signal circuit, main control unit, mainboard external input source interface form local loopback (loopback ) pathway; including the following detection steps:

Step 1, after receiving the interface self-test command, judge whether there is a signal line connected to the external input source interface of the motherboard, if not, go to step 2, and stop the test if there is;

In step 2, the main control unit sends an interface detection signal to the self-detection signal circuit, and the interface detection signal passes through the self-detection signal circuit, the external input source interface of the main board, and the original signal circuit of the interface in turn, and returns to the main control unit;

Step 3, the main control unit compares the received interface detection signal with the preset standard signal range, if it exceeds the preset standard signal range, then judges that the interface connection is abnormal, if within the preset standard signal range If it is within the range, it is judged that the interface is working normally.

Preferably, the external input source interface of the motherboard is a component interface, the component interface includes a video interface, the self-detection signal circuit includes a self-detection video signal circuit, the main control unit is the main chip of the motherboard, and the self-detection video The signal circuit, the original signal circuit of the interface, the main chip of the main board, and the video interface form a local loopback (loopback) path; the second step specifically includes that the main chip of the main board sends the interface detection signal to the self-detection video signal circuit , the interface detection signal passes through the self-detection video signal circuit, the video interface, and the original signal circuit of the interface in sequence, and returns to the main chip of the motherboard.

Preferably, the external input source interface of the main board is a component interface, the component interface also includes an audio interface, the main control unit is a main chip of the main board, the self-detection signal circuit includes a self-detection audio signal circuit, and the The self-detection audio signal circuit, the original signal circuit of the interface, the internal interface of the earphone, the main chip of the main board, and the video interface form a local loopback (loopback) path; the second step specifically includes that the main chip of the main board sends the self-detection audio signal The circuit sends the interface detection signal, and the interface detection signal passes through the internal interface of the earphone, the self-detection audio signal circuit, the audio interface, and the original signal circuit of the interface in turn, and returns to the main chip of the main board.

The beneficial effect of the present invention is that the present invention sends the interface detection signal through the main chip of the TV main board itself, and then receives it by itself, compares and judges whether there is an abnormality in the signal transmission, and then judges whether the interface function is normal, which not only completes the detection of the TV main board, but also reduces external The purchase and connection of equipment reduces maintenance costs and production costs, and at the same time avoids problems such as misoperation and poor connection caused by cumbersome operations.

Description of drawings

Fig. 1 is the method flowchart provided by the present invention;

Fig. 2 is the system structural diagram that the present invention provides;

FIG. 3 is a schematic structural diagram of a component interface loopback path provided by an embodiment of the present invention;

4 is a schematic diagram of the connection between the motherboard main chip and the video interface self-detection circuit provided by the embodiment of the present invention;

Fig. 5 is a schematic diagram of the connection between the motherboard main chip and the audio interface self-detection circuit provided by the embodiment of the present invention;

Fig. 6 is a schematic diagram b of the connection between the motherboard main chip and the audio interface self-detection circuit provided by the embodiment of the present invention;

7 is a flowchart of a video interface self-detection method provided by an embodiment of the present invention;

FIG. 8 is a flow chart of a method for self-detection of an audio interface provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the protection scope of the present invention.

As shown in Fig. 1, the present invention provides a kind of self-detection method of TV motherboard, the interface on the motherboard is provided with self-detection signal circuit, described self-detection signal circuit, interface original signal circuit, main control unit, mainboard external input source The interface forms a local loopback (loopback) path; including the following detection steps:

Step S101, receiving the interface self-test command, and judging whether there is a signal line on the external input source interface of the motherboard

Access, if no, enter S102, if yes, stop detection;

Step S102, the main control unit sends an interface detection signal to the self-detection signal circuit, and the interface detection signal passes through the self-detection signal circuit, the external input source interface of the main board, and the original signal circuit of the interface in turn, and returns to the main control unit;

Step S103, the main control unit compares the received interface detection signal with the preset standard signal range, if it exceeds the preset standard signal range, then judges that the interface connection is abnormal, if it is within the preset standard signal range , it is judged that the interface works normally. After the main chip of the motherboard receives the returned self-test signal, it will compare and judge with the sent self-test signal, and then feed back the self-test result according to the preset rules.

As shown in Figure 2, corresponding to the self-testing method of the TV mainboard, the present invention provides a self-testing system for the TV mainboard, including: a self-testing signal circuit 201, a mainboard external input source interface 202, a main control unit 203, an interface source There is a signal circuit 204;

The first end of the original signal circuit 204 of the interface is connected to the external input source interface 202 pin of the main board, and the second end is connected to the detection signal input end of the main control unit 203;

When the mainboard external input source interface 202 has no signal line access, the pin at one end of the self-detection signal circuit 201 is connected to the pin at the first end of the original signal circuit 204 of the interface, and the mainboard external input When the source interface 202 is connected with a signal line, the pin at one end of the self-detection signal circuit 201 is disconnected from the pin at the first end of the original signal circuit 204 of the interface, and the other end of the self-detection signal circuit 204 connected to the detection signal output end of the main control unit 203;

When no signal line is connected to the external input source interface 202 of the motherboard, the self-detection signal circuit 201 , the original signal circuit 204 of the interface, and the main control unit 203 form a local loopback (loopback) path.

In a specific solution, the mainboard external input source interface 202 is a component interface, the component interface includes a video interface, the self-detection signal circuit 201 includes a self-detection video signal circuit, and the main control unit 203 is a mainboard main chip; When the video interface has no video component signal line connected, the pin of the first end of the original signal circuit of the interface is connected to the video interface pin, and the second end is connected to the detection signal input pin of the main chip of the main board. The pin at one end of the self-detection video signal circuit is connected with the pin at the first end of the original signal circuit of the interface, and the other end is connected with the detection signal output pin of the main chip of the main board. The detection video signal circuit, the original signal circuit of the interface, and the main chip of the motherboard form a local loopback (loopback) path.

Preferably, it also includes an earphone internal interface, the external input source interface 202 of the mainboard is an audio interface, the main control unit 203 is a main chip of the mainboard, and the self-detection signal circuit 201 includes a self-detection audio signal circuit; the audio interface When no audio component signal line is connected, the pin of the first end of the original signal circuit of the interface is connected to the pin of the audio interface, and the pin of the second end is connected to the detection signal input pin of the main chip of the main board. One end of the self-detection audio signal circuit is connected to the pin of the first end of the original signal circuit of the interface, and the other end is connected to the internal interface pin of the earphone, and the internal interface pin of the earphone is connected to the internal interface pin of the earphone. The audio signal output pins of the motherboard main chip are connected, and the original signal circuit of the interface, the motherboard main chip, the self-detection audio signal circuit, and the earphone internal interface form a local loopback (loopback) path.

Hereinafter, the present invention will be described in detail by taking the self-detection signal circuit installed in the component interface of the main board of the TV as an embodiment.

As shown in Figure 3, the component interface includes a video interface and an audio interface, the self-detection signal circuit provided at the video interface is a self-detection video signal circuit, and the self-detection signal circuit provided at the audio interface is a self-detection audio Signal circuit, the self-detection video signal circuit is sequentially connected with the video interface, the original signal circuit of the video interface, and the main chip of the motherboard to form a loop; the self-detection audio signal circuit is connected with the audio interface and the original audio interface The signal circuit, the media circuit, and the main chip of the motherboard are connected in sequence to form a loop.

33, 36, 38 are self-detection video signal circuits, 31, 32, 34, 35, 37 are original signal circuits of video interface, 311, 313 are self-detection audio signal circuits, 39, 312 are original signal circuits of audio interface, 314 is a digital signal circuit, 3000, 3001, 3002 are video interfaces, 3003, 3004 are audio interfaces.

As shown in FIG. 4 , it is a schematic diagram of the connection between the main chip of the motherboard and the self-detection video signal circuit. Select the 3 I/O ports of the main chip of the motherboard as the video self-detection signal output port,

When carrying out video interface self-testing work, the main chip of the main board transmits the self-testing video signal to the self-testing video signal circuit 33, 36, 38 places, because at this moment through the video interface, (31,33), (34,36), The circuits of (37, 38) are connected, so the self-detection video signal can pass through the component interface and then return to the main chip of the motherboard through the circuits 33, 36, and 38.

As shown in Figure 5 and Figure 6, it is a schematic diagram of the connection between the motherboard main chip and the audio interface self-detection circuit provided by the embodiment of the present invention;

The media circuit refers to the headphone sound output circuit of the sound power amplifier chip 51 of the motherboard. The self-detection audio signal circuits 311, 313 can be directly connected to the earphone sound output circuit pins of the sound power amplifier chip 51 of the motherboard, and the original earphone sound output circuit connections 311, 313 are used to output the detection signal.

Similar to the video component interface, in the earphone interface 52, when the earphone cable (61, 311) and (62, 313) are not inserted, the audio interface self-test can be performed normally. After plugged in, it is disconnected, self-testing cannot be performed, and the plugged-in earphones can work normally. The normal operation here means that the earphones provide normal functions.

When the audio interface is self-testing, the main chip sends the self-testing audio signal to the sound power amplifier chip 51, and the sound power amplifier chip is decoded and output to the earphone interface 52 from the earphone sound output channel. Since (61, 311) (62, 313) is in the connected state at this time, the self-detection audio signal can enter the 311, 313 channel through the earphone interface, and at this time (39, 311) (312, 313) is also in the connected state, so The self-test audio signal will pass through the audio interface, and then return to the main chip of the main board to complete the self-test of the audio interface.

When the external input source interface of the motherboard is not connected to the interface signal line, the loopback path is closed and can perform self-test; when the external input source interface of the motherboard is connected to the interface signal line, the loopback path is disconnected , the externally connected interface signal line can perform normal signal input work. Specifically, (32, 33) (35, 36) (38, 37) (39, 311) (312, 313) in the component interface are connected, so the Loop Back path is closed, and self-test can be performed normally. When the external signal line is connected, the above-mentioned interface pins are separated, and the Loop Back path is disconnected at this time, and self-testing cannot be performed, but the externally connected signal can be input and work normally. The aforementioned ability to perform normal signal input work means that the component interface can perform original functions.

As shown in Figure 7, the flow chart of the video interface self-detection method provided by the embodiment of the present invention includes the following steps:

Step S701, start the video interface self-detection function.

Specifically, in the embodiment of the present invention, a button or a function item representing the video self-detection function may be selected by using the buttons of the remote control or other control devices including the function menu displayed on the display to determine the execution of the video interface self-test, and skip to step S702.

Step S702, configure relevant parameters, and send the self-detection video signal to the self-detection video signal circuit according to the configured parameters of the motherboard main chip; skip to step S703;

Step S703, receiving self-detection video signal; skip to step S704.

The self-detection video signal passes through the main chip of the motherboard, the self-detection video signal circuit, the video interface, the original signal circuit of the interface in turn, and returns to the main chip of the motherboard.

Step S704, judging whether the video interface is abnormal, if so, jump to step S705; if not, jump to step S706;

The method for the above judgment can be as follows: comparing the received self-detection video signal with the preset standard signal range, if it exceeds the preset standard signal range, it is judged that the interface connection is abnormal; if it is within the preset standard signal range , it is judged that the interface works normally.

Step S705, the video interface is normal, and this self-test is ended;

Step S706, the video interface is abnormal, skip to step S707;

Step S707, troubleshooting the motherboard failure, and then re-testing.

As shown in FIG. 8 , it is a flow chart of the audio interface self-detection method provided by the embodiment of the present invention.

Step S801, start the audio interface self-detection function.

Specifically, in the embodiment of the present invention, a button or a function item representing the video self-detection function can be selected by using the buttons of the remote control or other control devices including the function menu displayed on the display to determine the execution of the audio interface self-test, and skip to step S802.

Step S802, configure relevant parameters, and send the self-detection audio signal to the self-detection audio signal circuit according to the configured parameter main board main chip; skip to step S803;

Step S803, receiving the self-detection audio signal; skip to step S804.

When the audio interface is self-testing, the main chip of the main board does not leave a pin for directly outputting audio signals to the self-testing audio signal circuit. After being decoded, the power amplifier chip is output from the earphone sound output channel to the earphone interface. Then, the self-detection audio signal can enter the self-detection audio signal circuit through the earphone interface, and then, through the audio interface, pass through the original signal circuit of the interface, and finally, return to the original signal circuit of the interface. Describe the motherboard main chip.

Step S804, judging whether the video interface is abnormal, if so, skip to step S805; if not, skip to step S806;

The method for the above judgment may be to compare the received self-detection audio signal with the preset standard signal range, and if it exceeds the preset standard signal range, it is judged that the interface connection is abnormal; if it is within the preset standard signal range , it is judged that the interface works normally.

Step S805, the audio interface is normal, and this self-test is ended;

Step S806, the audio interface is abnormal, skip to step S807;

Step S807, troubleshooting the motherboard failure, and then re-testing.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (6)

1. a TV motherboard self-check system, is characterized in that, comprising:

The original signal circuit of interface, certainly detect the outside input source interface of signal circuit, main control unit, mainboard;

The original signal circuit first end of described interface is connected with the outside input source interface pin of described mainboard, and the second end is connected with the detection signal input of described main control unit;

When the access of the outside input source interface of described mainboard no signal line, the described pin from detection signal circuit one end is connected with the pin of the first end of the original signal circuit of described interface, when the outside input source interface of described mainboard has holding wire access, the described pin disconnection from detecting the pin of signal circuit one end and the first end of the original signal circuit of described interface, the described other end of signal circuit and the detection signal output of described main control unit of certainly detecting is connected;

When the access of the outside input source interface of described mainboard no signal line, described from detecting signal circuit, the original signal circuit of described interface, described main control unit formation local loopback (loopback) path.

2. TV motherboard self-check system according to claim 1, it is characterized in that, the outside input source interface of described mainboard is component interface, and described component interface comprises video interface, the described signal circuit that certainly detects comprises that described main control unit is mainboard master chip from detecting video circuit; When described video interface accesses without video component holding wire, the pin of the original signal circuit first end of described interface is connected with described video interface pin, second is connected with described mainboard master chip detection signal input pin, the described pin from detection video circuit one end is connected with the pin of the original signal circuit first end of described interface, the other end is connected with described mainboard master chip detection signal output pin, described from detecting video circuit, the original signal circuit of described interface, described mainboard master chip formation local loopback (loopback) path.

3. TV motherboard self-check system according to claim 1 and 2, it is characterized in that, also comprise earphone internal interface, the outside input source interface of described mainboard is audio interface, described main control unit is mainboard master chip, and the described signal circuit that certainly detects comprises self check survey audio signal circuit, when described audio interface absence of audio component signal line access, the pin of the original signal circuit first end of described interface is connected with described audio interface pin, the pin of the second end is connected with the detection signal input pin of described mainboard master chip, described self check is surveyed audio signal circuit one end and is connected with the pin of the original signal circuit first end of described interface, the other end is connected with described earphone internal interface pin, described earphone internal interface pin is connected with described mainboard master chip audio signal output pin, the original signal circuit of described interface, described mainboard master chip, audio signal circuit is surveyed in described self check, described earphone internal interface, form local loopback (loopback) path.

4. a TV motherboard self-sensing method, it is characterized in that, interface setting on mainboard is from detecting signal circuit, and the described signal circuit of detection certainly, the original signal circuit of interface, main control unit, the outside input source interface of mainboard form local loopback (loopback) path; Comprise following detecting step:

The 1st step, receives interface from detecting instruction, judges whether the outside input source interface of mainboard has holding wire access, as nothing, enters the 2nd step, if any, stop detecting;

The 2nd step, main control unit is to described from detecting signal circuit transmission interface detection signal, and described interface detection signal by described signal circuit, the outside input source interface of mainboard, the original signal circuit of described interface of certainly detecting, returns to described main control unit successively;

The 3rd step, described main control unit compares received interface detection signal and preset standard range of signal, if exceed preset standard range of signal, judges that described interface connects abnormal, if in described preset standard range of signal, judge that described interface normally works.

5. TV motherboard self-sensing method according to claim 4, it is characterized in that, the outside input source interface of described mainboard is component interface, described component interface comprises video interface, the described signal circuit that certainly detects comprises from detecting video circuit, described main control unit is mainboard master chip, described from detecting video circuit, the original signal circuit of interface, mainboard master chip, video interface, forms local loopback (loopback) path; Described the 2nd step specifically comprises, mainboard master chip sends described interface detection signal to described from detecting video circuit, described interface detection signal by described video circuit, video interface, the original signal circuit of interface of certainly detecting, returns to mainboard master chip successively.

6. according to the TV motherboard self-sensing method described in claim 4 or 5, it is characterized in that, also comprise that the outside input source interface of described mainboard is component interface, described component interface also comprises audio interface, described main control unit is mainboard master chip, the described signal circuit that certainly detects comprises self check survey audio signal circuit, and audio signal circuit, the original signal circuit of interface, earphone internal interface, mainboard master chip, video interface are surveyed in described self check, form local loopback (loopback) path; Described the 2nd step specifically comprises, mainboard master chip is surveyed audio signal circuit to described self check and is sent described interface detection signal, described interface detection signal is surveyed audio signal circuit, audio interface, the original signal circuit of interface by described earphone internal interface, self check successively, returns to mainboard master chip.

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