JP3353363B2 - Television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver capable of displaying various data on a display screen in a service mode for performing a repair or a maintenance. It is.

[0002]

2. Description of the Related Art Today's television receivers are connected to a main microcomputer by various control circuits such as a tuner and video signal processing via a control bus which is a common path for exchanging control signals (data, etc.). Various operations and adjustments are performed by control signals transmitted via the control bus.

FIG. 5 is a partial circuit block diagram of a television receiver in which various controls are performed by a control bus. In this figure, 1 is a U / V tuner for selecting a terrestrial broadcast received by the U / V antenna 18 via the mixer 20 and the distributor 21, and 2 is received by the BS antenna 16 and the CS antenna 17. A BS / CS tuner for selecting a satellite broadcast input via a mixer 20 and a distributor 21, a decoding unit 3 for decoding (decrypting) a scrambled (encrypted) broadcast radio wave to be transmitted, and 4 for the U / U From the signals selected by the V tuner 1 and the BS / CS tuner 2,
An AV switch that extracts audio and synchronization signals, and further selects and outputs the respective signals and video, audio signals, and synchronization signals input from external input terminals t1, t2, and t3 is shown.

[0005] Reference numeral 5 denotes a video processor for performing video signal processing. The processed video signal is supplied to an RGB drive 8 and displayed on a CRT 11 or output to an external device via a monitor output terminal V. The video processor 5 outputs a reference signal (white balance) to the RGB drive 8. The RGB drive 8 outputs the cathode current Ik (RGB) of the CRT 11 when the reference signal is output.
Is output to the video processor 5, and the video processor 5 outputs a drive signal for achieving white balance from the input information of the cathode current Ik. Reference numeral 5a denotes a service display generating unit, which supplies a display signal for performing a screen display for the adjustment to the video processor 5 in a service mode for performing maintenance such as various adjustments described later.

[0005] Reference numeral 6 denotes an audio processor for performing audio signal processing. The processed audio signal is supplied to an audio drive 9 and output from a speaker 12 or from an external terminal t4 to an external device. Reference numeral 7 denotes a scan processor which receives a synchronization signal from the AV switch 4 and supplies a horizontal / vertical deflection current to the deflection yoke 10 at the timing of the synchronization signal.

Reference numeral 14 denotes a CPU which controls the above-described functional circuits via a control bus CB in accordance with an operation or control command which is output from a remote commander RC and input via an infrared light receiving unit 13, and 15 denotes various control data. And a memory (RAM) in which the status of each functional circuit is stored.

The control bus CB includes an address bus for designating an address which is data for designating an input / output location of transmission data, and a data bus for exchanging data for actual control and the like. In some cases, the signal paths are shared, or the signal paths are provided individually (two).

Each functional circuit such as the U / V tuner 1 and the BS / CS tuner 2 is assigned a dedicated address code (hexadecimal). And CPU1
For example, when the U / V tuner 1 switches the channel selected by the U / V tuner 1, the U / V tuner 1 transmits the address code of the U / V tuner 1 on the address bus, thereby making the U / V tuner 1 transmit the address code.
Only / V tuner 1 is in a standby state for control data input. Then, control data is transmitted via the data bus, and channel switching of the U / V tuner 1 is executed.

In addition, when each of the functional circuits such as the U / V tuner 1 receives the control data, it uses a bidirectional communication system in which an acknowledgment signal indicating the input is returned to the CPU 14 so that a large number of functional circuits can be implemented. It is possible to connect two types of bus lines, an address bus and a data bus, to control efficiently with serial data.

Various adjustments are made via the control bus CB in a service mode for performing maintenance or the like, in addition to a normal operation / control performed by a user. In this service mode, the television receiver is set to a standby state, for example, the remote commander RC.
This is achieved by turning on the power after performing a predetermined key operation such as a key operation. Then, the status (data) of various functional circuits stored in the memory 15 is displayed on the CRT 11 via the control bus CB by the service display generating unit 5a, and the operation of the remote commander RC is referred to by referring to the status display. Various adjustments can be made using keys and the like. At the same time as various adjustments are made, the contents of the status (data) of each functional circuit stored in the memory 15 are also rewritten.

As described above, adjustment data and the like can be exchanged via the control bus CB, and the data can be displayed on the display screen. Therefore, each function can be easily performed while the television receiver is installed in the place. The situation of the circuit can be grasped and maintenance can be performed.

[0012]

As described above, the status (data) of each functional circuit can be confirmed on the CRT 11 by the control bus CB, but the serial number indicating the date of manufacture, specifications, etc. of the television receiver is provided. Since the number (serial number) is described or affixed to the side or the back of the television receiver or attached to a label, for example, when the television receiver is repaired when installed at the user's house or after the repair. Unless the television receiver is moved, it is difficult to easily check the age or the television receiver manufactured at which factory has failed. The status of each functional circuit in the service mode, that is, adjustment data (data such as volume, picture, hue, etc.) set in each functional circuit is stored in the CRT 11.
It is only possible to confirm the above, and for example, if a failure has occurred in the CRT 11, the status is not displayed, so that the status of each functional circuit could not be grasped and maintenance could not be performed.

[0013]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and has a means for storing a serial number indicating the date of manufacture of a television receiver. In the service mode to be performed, the serial number can be read out and displayed on the display screen. Further, a display signal for displaying the service mode can be output to the outside as a monitor output.

[0014]

In the service mode, various displays are displayed on the CRT.
Since the confirmation can be made through the screen, the maintenance work efficiency can be improved, and more accurate adjustment can be performed.

[0015]

Embodiments of the present invention will be described below. In the case of the television receiver of the present invention, the circuit configuration is the same as that described in the block diagram of FIG. 5, but in the case of the present invention, the serial number is stored in the memory 15 shown in FIG. I have. FIG. 1 is a diagram showing a flowchart in the case where a serial number is stored in a manufacturer at the time of manufacturing. First, it is detected whether or not it is the serial number storage mode (S
001), if the mode is the storage mode, the serial number is input (S002). Then, the input serial number is confirmed on the screen (S003), and writing to the memory 15 is performed (S004).

FIG. 2 is a flowchart showing a case where the serial number written in the memory 15 is read out in the service mode at a user's house, for example. First, as described above, the television receiver is shifted to the service mode by operating a predetermined key such as the remote commander RC (S101). After shifting to the service mode, it is detected whether or not the command input from the remote commander RC is a display command of a serial number (S102). If the command is a display command, the serial number is read from the memory 15 (S103). Then, as shown in FIG.
11 to display the serial number (S10
Four).

Conventionally, since the serial number is described on the back or side of the television receiver, it has been necessary to move a large television receiver to confirm the serial number. As described in the flowchart, by reading the serial number stored in the memory 15 and displaying it on the CRT 11, it is possible to easily check the serial number without moving the television receiver.

The display of the service mode including the serial number described above is performed on the CRT 11 to improve the maintenance efficiency. However, in the television receiver of the present invention, the monitor signal of the service mode is output to the outside. Thus, even when the screen display cannot be performed due to, for example, a defect in the CRT 11 itself, sufficient maintenance can be performed as described below.

FIG. 4 is a block diagram showing a circuit configuration of a television receiver according to the present invention. In FIG. 4, the same reference numerals as those in FIG. 5 denote the same parts. In this figure, reference numeral 22 denotes a switch for switching the output of the monitor signal M in the service mode to the monitor output terminal V. In a normal case where the user is watching a broadcast program, the switch 22 is turned off and only the RGB output is monitored. Output from the output terminal V. Reference numeral 23 denotes an adding circuit for adding the RGB output and the monitor signal in the service mode.

First, as described above, the remote commander RC
The mode is shifted to the service mode by a predetermined key operation such as a key operation. If the screen is not displayed due to a defect of the CRT 11 itself even when the mode is shifted to the service mode, the switch 22 is turned on by operating a key such as a remote commander RC after shifting to the service mode. When the switch 22 is turned on, the monitor signal M output from the service display generator 5a is added to the normal RGB output by the adder circuit 23 and output from the monitor output terminal V. And this monitor output terminal V,
By connecting a monitor input terminal of an external monitor device (not shown) with a connection cable or the like, each data in the service mode can be confirmed by the external monitor device.

The monitor signal M in the service mode has three primary colors R.
Although a GB signal may be used, the data in the service mode does not require a variety of color displays. For example, by using a single color signal of only the G signal, it is not necessary to perform component conversion of the monitor signal M, and the manufacturing cost can be reduced. .

[0022]

As described above, the television receiver of the present invention is provided with the storage means for storing the serial number, so that the serial number is read out from the storage means and displayed on the display screen in the service mode. When performing a repair or a service, the serial number can be confirmed without moving a particularly large television receiver. For this reason, it is possible to supervise the manufacturing plant and the age of the failed television receiver, and to prompt the cause of the failure from the data. In addition, since various operation data output when the service mode is set can be output to the monitor, it is possible to provide a service display even when the display on the screen cannot be performed due to a defect such as a CRT. By connecting the monitor device to the external output terminal, there is an effect that the operation state of the television receiver can be grasped.

[Brief description of the drawings]

FIG. 1 is a diagram showing a flowchart when a serial number is stored.

FIG. 2 is a diagram showing a flowchart when a serial number is read.

FIG. 3 is an explanatory diagram when a serial number is displayed on a CRT.

FIG. 4 is a diagram showing a circuit block when a monitor signal in a service mode is externally monitored and output;

FIG. 5 is a diagram showing circuit blocks of a conventional television receiver.

[Explanation of symbols]

 5 Video Processor 5a Service Display Generating Unit 15 Memory 22 Addition Circuit RC Remote Commander CB Control Bus

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/38-5/46 H04N 17/04

Claims (2)

(57) [Claims] 1. A normal display mode for performing a normal display, and
A television receiver provided with a service display mode capable of performing management and maintenance, and manufacturing the television receiver together with various adjustment data.
Storage means for storing a number, the normal display mode and the service display by a predetermined operation
Mode and the service display mode.
From the storage unit, the various adjustment data and the serial number
And a control unit for reading and outputting a screen display for adjustment in the service display mode.
Service display generating means for generating an adjustment signal for adjusting
And a video signal received in the normal display mode.
Signal processing and output, generating the service display in the service display mode
The adjustment signal from the means and the output from the control unit.
Video signal processing of various adjustment data and the serial number
A video signal processing means for outputting a display to perform display based on the output from the video signal processing unit
Means and the video signal processing means in the service display mode
Television receiver, characterized by comprising a monitor output terminal, a for outputting an output signal from the. 2. The output signal from the monitor output terminal.
The television receiver according to claim 1, wherein is a single color signal .