KR100245524B1 - Method for self-testing communication bus of television - Google Patents

Abstract

The present invention provides a self-diagnosis of a state of a control unit for controlling the entire device of a television, for example, a communication bus, for example, a communication path between a microcomputer and the device, for example, an I ² C bus, and a state of the communication bus on a CRT screen of the television. The present invention relates to a communication bus self-diagnosis method of a television which is capable of outputting OSD characters for a television. A first step of judging whether the test mode is set by the control signal input unit 1 while performing the reproducing process; and if the test mode is set as a result of the determination, the test data stored in the register 14 is read out to test the test data. A second step of outputting the data to the communication bus, a third step of returning the test data to the microcomputer 12, A fourth step of comparing the test data outputted to the communication bus with the test data inputted to determine whether the communication line is in a state; and if the test data is the same, the communication line is in a normal state. A fifth step of determining and reporting a normal state of the communication bus through the display means, and if the test data is not the same, determining that the communication line is in an error state and reporting an error state of the communication bus through the display means. Characterized in consisting of steps.

Description

Self-diagnosis method of communication bus in television {METHOD FOR SELF-TESTING COMMUNICATION BUS OF TELEVISION}

The present invention relates to a communication bus, self-diagnosis method for a television, and more particularly to a control unit for controlling the device overall in the television, for example, a microcomputer and, for example the device is a communication bus communication (Communication) between the overall path, I ² C bus, The present invention relates to a method of diagnosing a communication bus itself in a television, which is capable of self-diagnosing a state of a signal and outputting an OSD character on the CRT screen of the television.

The prior art will be described with reference to FIG. 1.

Reference number 1 shown in Figure 1 is typically composed of a control panel installed on the front of the television, or a remote control for remote control of the television consists of a plurality of keys for setting the overall function of the television 2 is a control signal input unit, and 2 denotes the entire apparatus so that the overall operation of the television, for example, a tuning operation of a specific channel, is performed or the volume level or screen adjustment state is adjusted based on the control signal input from the control signal input unit 1. The microcomputer outputs a clock signal CLK and control data for control.

Reference numeral 3 is an I ² C bus, which is composed of a clock transmission line SCK and a data transmission line SDA, and is a communication line for transferring the clock signal and data transmitted from the microcomputer 2 to a specific device. 4 is an OSD processing unit for generating an OSD text signal for displaying the function setting state set by the control signal input unit 1 on the CRT screen based on the OSD color signal applied from the microcomputer 2, and 5 The tuner tunes a specific channel among a plurality of broadcast channels received through an antenna based on the tuning voltage VT applied from the microcomputer 2.

In addition, reference numeral 6 denotes an IF conversion process of the broadcast signal applied from the tuner 5, and then divided into an audio signal and a video signal, and applied to the audio signal processor 7 and the video signal processor 10 connected to the rear stage. IF module, 7 is a voice signal processing unit that performs voice processing, for example, volume / surround / voice multiple processing, etc. on the voice signal output from the IF module 6 under the control of the microcomputer 2, and 8 is the above. It is a voice amplifier which amplifies a voice signal output from the voice signal processor 7 through a speaker to a predetermined amplification degree.

Further, reference numeral 10 is applied from the microcomputer 2 while performing image processing for color / tint / brightness / sharpness on the video signal output from the IF module 6 under the control of the microcomputer 2. On the basis of the OSD blank signal is an image signal processing unit for performing the screen insertion process for the RGB signal to the OSD text signal applied from the OSD processing unit 4 and outputs the RGB signal according to the 11, the image signal processing unit ( The video amplification unit amplifies the video signal output from 10) so that it can be reproduced and output through the CRT screen.

Next, the general operation of the television having the above-described configuration will be briefly described.

When the control signal for power-on and channel selection are input from the control signal input unit 1, the microcomputer 2 turns on the power of the television based on the control signal and is a channel to be tuned to. When the preset voltage VT corresponding to the readout is read by the channel data storage unit 3 and the corresponding tuner voltage VT is applied to the tuner 5, the tuner 5 is identified by the tuner voltage VT. Perform channel tuning for the channel.

Subsequently, the tuner 5 applies the broadcast signal for the selected channel to the IF amplifier 6, and the IF amplifier 6 amplifies the IF signal of the corresponding broadcast signal and then connects the SIF to the rear end. It is applied to the detector 7 and the PIF detector 10.

Here, the SIF detector 7 detects only the SIF (voice intermediate frequency) signal from the IF signal output from the IF amplifier 6 and applies it to the audio signal processor 9 connected to the rear stage. The processing unit 8 performs voice processing according to the volume level or voice multiplexing process set through the control signal input unit 1 with respect to the corresponding SIF signal under the control of the microcomputer 2, and is connected to the rear end of the audio amplifier 9 Is applied to the speaker SP connected to the rear stage SP by amplifying the voice signal from the voice signal processor 8 with a predetermined amplification. The audio signal of the channel is output.

In addition, the PIF detector 10 detects only the PIF (image intermediate frequency) signal from the IF signal output from the IF amplifier 6 and applies it to the image signal processor 11 connected to the rear stage. The signal processing unit 11 performs image processing such as color / brightness / tint / sharpness on the PIF signal under the control of the microcomputer 2, and also inserts the OSD text signal applied from the OSD processing unit 4. Then, the video signal corresponding thereto is applied to the video amplifier 12 connected to the rear end, and the video amplifier 32 amplifies the video signal and then applies the video signal to the CRT. Is played back.

In this case, however, the microcomputer 2 transmits the tuner 5, the IF module 6, the audio signal processor 7, the voice amplifier 8, and the OSD processor 4 via the I ² C bus. The two lines constituting the I ² C bus in the state of controlling the corresponding devices to perform a predetermined operation by applying a predetermined clock signal and a control signal to the image signal processor 10 and the image amplifier 11 ( SCK and SDA are in an error state, for example, a short state or a ground state, and when an error occurs in the corresponding clock signal and control signal output from the microcomputer 2, If the original clock signal and the control signal outputted are not applied to the corresponding device, the corresponding device receiving the clock signal and the control signal having an error performs a malfunction based on the clock signal and the control signal.

For this reason, if the television breaks down, the user cannot visually check the broken portion of the television, so the user can disassemble the television and check the status of each device installed on the PCB board. In order to find the cause of the failure, in this case, the user has to dismantle the TV troublesomely, and if the user does not have accurate knowledge of each device, it becomes virtually impossible to identify the cause of the failure.

Accordingly, the present invention has been made in view of the above circumstances, and self-diagnoses the state of a control unit for controlling the entire apparatus of the television, for example, a communication bus, for example, an I ² C bus, which is a communication path between the microcomputer and the apparatus. It is an object of the present invention to provide a method for diagnosing a communication bus itself in a television, which is capable of outputting OSD text on the status of the communication bus on a CRT screen of the television.

According to an embodiment of the present invention for realizing the above object, in a television performing playback processing for a video signal and a video signal from a broadcast signal received through an antenna, while performing playback processing for a TV broadcast signal A first step of determining whether a test mode is set by a control signal input unit; and a second step of reading test data stored in a register and outputting the test data to a communication bus when the test mode is set as a result of the determination; A third step of returning data to the microcomputer, a fourth step of comparing the test data output to the communication bus with the test data inputted to determine the state of the communication line, and the determination result of both tests If the data is the same, the communication line is determined to be in a normal state and the communication means While reporting the normal state of the bus, if the two test data are not the same, it is determined that the communication line is in an error state, and a communication bus in a television comprising a fifth step of reporting an error state of the communication bus through a display means. Self diagnostic methods are provided.

According to the present invention consisting of the above steps, when the user operates the test key (1a) configured in the control signal input unit 1, a test for the microcomputer 12 to check the state of the I ² C bus (3) After outputting the data, the fed back test data is compared with the output original test data, and the state of the I ² C bus 3 is checked, and the state is displayed as OSD characters on the CRT screen. The user can easily check the state of the I ² C bus (3).

1 is a block diagram of a conventional television;

2 is a block diagram of a television to which an embodiment of the present invention is applied;

3 is a flowchart illustrating a method of diagnosing a communication bus itself in a television according to an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: control signal input, 2, 12: microcomputer,

3: I ² C bus, 4: OSD processing unit,

5: tuner, 6: IF module,

7: voice signal processing unit, 8: voice amplifier,

10: video signal processor, 11: video amplifier,

14: Register.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a television to which the present invention is applied, and the same reference numerals as those of FIG. 1 are used for components that perform the same functions as those of FIG. 1, and detailed description thereof will be omitted. Let's do it.

Reference numeral 1 shown in FIG. 2 denotes a control signal input unit configured with a test key 1a for setting a test mode for checking the state of the I ² C bus 3 in the television, and 14 denotes the test mode. The register 12 stores predetermined test data for performing the operation. When the communication bus diagnostic mode is set by the control signal input unit 1, 12 registers the test data stored in the register 14 sequentially and then returns. It is a microcomputer that determines whether the input test data is identical to the original test data, and outputs an OSD character for the state of the I ² C bus 3 according to the determination result on the CRT screen.

In addition, reference numeral 4 denotes an OSD character indicating the state of the communication bus under the control of the microcomputer 12, for example, 'the communication bus is normal.' Or OSD processing unit to generate OSD text signal for 'There is a problem in communication bus.'

Hereinafter, a method of diagnosing a communication bus itself in a television according to an embodiment of the present invention will be described in detail with reference to the flowchart shown in FIG. 3.

First, the microcomputer 12 performs a playback process for a TV broadcast signal based on a power on signal and a channel tuning signal applied from the control signal input unit 1 (step 20). (1) It is determined whether the test key (1a) signal is input (step 22), and if the test key (1a) signal is not input from the control signal input unit 1 according to the determination result NO in step 22 Proceed to initial state.

On the contrary, when the user operates the test key 1a configured in the control signal input unit 1 to check the state of the I ² C bus 3 configured inside the television by causing the television to malfunction. The microcomputer 12 proceeds to step 24 according to the determination result YES in step 22, reads test data stored in the register 14, and sequentially stores the test data in the I ² C bus 3. (Step 26).

Here, the test data is data for checking an error state such as an abnormality of the I ² C bus 3, for example, disconnection, short circuit, ground, etc., and the data is set by the user. ', The short is'0010', the ground state is a predefined state, such as' 0110 'is stored in the register 14, the test data is the I ² C bus (I ² C bus to be examined between the microcomputer 12 and TV components ( In the case of 3), it can be defined that the capacity of the data bit is increased.

The test data output to the I ² C bus 3 is fed back to the microcomputer 12 through a fed back clock (FBC) terminal and a fed back data (FBD) terminal of the microcomputer 12. The microcomputer 12 determines whether the corresponding test data inputted through the FBC terminal and the FBD terminal is the same as the test data output from the microcomputer 12 (step 28), and then the I ² C bus 3 If the normal test data is the same and both test data are the same, the microcomputer 12 proceeds to step 30 according to the determination result (YES) of the step 28, and is the output of the test data from the microcomputer 12 completed? Judge.

For example, the microcomputer 12 checks the test data stored in the register 14, for example, the '0001' and '0010' data bits to check the disconnection and short circuit status of the corresponding I ² C bus for malfunction. Read and output sequentially, and when the data bit is fed back and input to the microcomputer 12 through the FBC terminal and the FBD terminal, the microcomputer 12 outputs the '0001' and '0010 output to the corresponding I ² C bus 'Compared with the data bits fed back and input data, and if the data bits are the same, the test data is output.

Subsequently, if the output of the test data from the microcomputer 12 is not completed according to the determination result, that is, if the test data to be output for the test of the I ² C bus 3 exists, the microcomputer 12 (12) proceeds to step 26 according to the determination result NO in step 30, outputs the remaining test data to the I ² C bus 3, and then proceeds to steps 26 to 30 described above. On the other hand, if the output of the test data is completed in the microcomputer 12, the microcomputer 12 proceeds to step 32 according to the determination result of the step 30, the microcomputer 12 in the step 32 The OSD blank signal is applied to the image signal processor 10 and a predetermined OSD color signal is applied to the OSD processor 4 to display the OSD characters indicating that the I ² C bus 3 is in a normal state. For OS D character signal, for example, 'communication line is normal' is generated, and then the OSD character signal is inserted into the image signal processor 10 and then outputted on the CRT screen through the image amplifier 11. Report to the user that the I ² C bus 3 is in a normal state through the OSD text displayed on the CRT screen.

On the other hand, if the test data input through the FBC terminal and the FBD terminal in step 28 does not match the test data output from the microcomputer 12, for example, '0001' data output for the disconnection test is the data. When inputted with a data bit different from the first output data without being fed back to the same data as the bit, the process proceeds to step 34 according to the determination result NO in step 28, in which the microcomputer 12 performs the image. An OSD character for indicating that the I ² C bus 3 is in an error state by applying an OSD blank signal to the signal processor 10 and a predetermined OSD color signal to the OSD processor 4, for example, 'communication' There was a problem with the bus. ' Alternatively, an OSD text signal such as an error content according to the content of the test data to be examined, that is, the communication bus is disconnected, is generated, and then the OSD text signal is inserted into the video signal processor 10 and then processed. By outputting the image on the CRT screen through the image amplification unit 11, the user reports that the I ² C bus 3 is in an error state through the OSD text displayed on the CRT screen.

That is, when the user manipulates the test key 1a, the microcomputer 12, which controls the entire apparatus of the television, outputs test data by itself, checks the state of the I ² C bus 3, and then checks the result. The OSD text for the CRT screen is displayed to report the status of the I ² C bus 3 to the user.

As described above, according to the method of diagnosing a communication bus itself in a television according to an embodiment of the present invention, when an error occurs in an I ² C bus that is a communication bus of the television, a state in which an error is generated in the I ² C bus occurs. As reported on the CRT screen, the user can accurately and quickly identify the cause of the failure of the television.

Claims (2)

In a television that performs a video signal and a playback signal for a video signal from a broadcast signal received through an antenna, A first step of determining whether the test mode is set by the control signal input unit 1 while performing reproduction processing for the TV broadcast signal; A second step of reading the test data stored in the register 14 and outputting the test data to the communication bus when the test mode is set as a result of the determination; A third step of returning the test data to the microcomputer 12; A fourth step of determining whether the communication line is in the state of the communication line by comparing the test data outputted to the communication bus with the feedback test data inputted; As a result of the determination, if both test data are the same, the communication line is determined to be in a normal state, and the normal state of the communication bus is reported through a display means, whereas if both test data are not the same, the communication line is in an error state. And a fifth step of determining and reporting an error state of the communication bus through the display means. The method of claim 1, wherein the communication line state is displayed on the CRT screen as OSD characters.