JPH0748886B2 - Self-diagnostic device for television receiver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a self-diagnosis device for a television receiver.

(Prior Art) In recent years, in a television receiver, digital signal processing technology has advanced. An example of this type of system will be described with reference to FIG.

The analog video signal supplied to the input terminal IN is converted into a digital video signal in the analog-digital converter 1. The digital video signal is supplied to the video chroma processing circuit 2 and the synchronous deflection processing circuit 7.

In the video chroma processing circuit 2, the luminance signal Y and the color difference signal R-
The separation processing of Y and BY is performed, and the separated luminance signal Y and color difference signals RY and BY are converted into digital / analog converter 3
Entered in. Then, the analog luminance signal Y and the color difference signal
RY and BY are input to the matrix circuit 4 and converted into R, G, B primary color signals, and the R, G, B primary color signals are input to the drive circuit 5. This drive circuit 5 input
The color cathode ray tube (CRT) 6 is driven based on the R, G, B signals.

On the other hand, the digital video signal is also input to the synchronous deflection processing circuit 7. In the synchronous deflection processing circuit 7, synchronous signal separation and horizontal and vertical synchronous processing are performed to generate horizontal and vertical drive pulses, which are input to the deflection drive circuit 8. As a result, the deflection drive circuit 8 outputs horizontal and vertical deflection signals to be supplied to the deflection yoke of the color cathode ray tube 8.

Furthermore, in this type of digital television receiver,
A microcomputer 10 is provided and controls various circuits.

For example, contrast adjustment data, color tone data, image quality adjustment data, color gain adjustment data, etc. are set for the video chroma processing circuit 2, and further deflection distortion correction data, deflection data are set for the synchronous deflection processing circuit 7. Amplitude adjustment data, phase adjustment data, etc. are set. These data are stored in the registers provided in the video chroma processing circuit 2 and the synchronous deflection processing circuit 7 for each adjustment item, and are set via the microcomputer 10.

Further, if the television receiver is applicable to PAL, NTSC, SECAM type television signals, the microcomputer 10 outputs switching data of the signal processing system of the system, synchronous frequency switching data, etc., It can be set in each signal processing block.

Here, when the above-mentioned various adjustment data is changed during the operation of the television receiver, the user can change the adjustment data through the microcomputer 10 by operating the operation unit (not shown). This allows the user to set a desired screen state.

In this way, when various adjustment data is created according to the user's preference, the adjustment data is also stored in the non-volatile memory 11. With this, when the power of the television receiver is turned on again, the adjustment data in the non-volatile memory 11 can be used to obtain the screen state desired by the user, which saves the user the trouble of readjustment. it can.

(Problems to be Solved by the Invention) In the system described above, when a failure occurs in the non-volatile memory or when a memory element in an unused (write data indefinite) state is mounted, the following state occurs. Occurs. That is, when the power is turned on, if the adjustment data is read from the non-volatile memory and set in each circuit, the screen is displayed in an uncertain state. Upon seeing this, the user may take a lot of time to perceive that the television receiver itself is out of order and to find out an easy point that causes the indeterminate screen. Further, as described above, if the adjustment data in the non-volatile memory 11 is significantly wrong, the television receiver may be operated at a set value exceeding the operating capability of the television receiver itself, which may lead to failure of the receiver itself.

Therefore, the present invention is a television receiver capable of preventing the influence from directly appearing in the receiver when the stored data value of the nonvolatile memory storing the adjustment data or the nonvolatile memory itself is abnormal. It is an object of the present invention to provide a self-diagnosis device of.

[Structure of the Invention] (Means for Solving the Problems) The present invention relates to a system in which the adjustment data of each circuit is read from a non-volatile memory and used when the television receiver is powered on. The adjustment data or test data corresponding to the adjustment data is read before setting in the circuit, and the adjustment data is supplied to each circuit only when the value of the adjustment data or the test data is within a predetermined range, and the predetermined range is set. When it is outside, predetermined standard operation data is supplied to each circuit.

(Operation) As described above, when there is an abnormality in the adjustment data or the test data, since the predetermined standard operation data is used, the failure of the television receiver is not induced, and At this time, if the nonvolatile memory has a failure, the adjustment result cannot be obtained even if the user makes an adjustment, so that it becomes easy to find the cause of the failure.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a digital television receiver according to the present invention, and FIG. 1 is an explanatory view of the main part thereof. As shown in FIG. 2, the configuration of the receiver for projecting an image is the same as that of the conventional one, so the same parts as those of the conventional circuit of FIG. 3 are designated by the same reference numerals.

The present invention is characterized in the progress processing when adjustment data is given from the non-volatile memory 20 to the adjusted circuit of the receiver via the microcomputer 21.

First, as shown in FIG. 1, when the television receiver is powered on, various adjustment data stored in the non-volatile memory 20 or test data corresponding thereto are read by the microcomputer 21, and the read data is read. It is determined whether the value is within a predetermined range (step
S1, S2, S3).

If the read data value is within the predetermined range, step S4
Then, each adjustment data in the non-volatile memory 20 is read and supplied to each circuit to be adjusted. On the contrary, when the read data value is out of the predetermined range, the process proceeds to step S5 and the following process is performed.

That is, the microcomputer 21 supplies the standard operation data stored in advance as program data to each circuit to be adjusted. As a result, the image state of the television receiver becomes the state set by the standard operation data. Therefore, the television receiver does not operate due to abnormal adjustment data. In addition, if there is an abnormality in the adjustment data of the non-volatile memory, it is possible that the non-volatile memory itself has a fault in addition to the abnormality in the data value. Although there is a possibility of causing a new failure in the receiver, the present invention can prevent this and provide a highly safe television receiver.

Further, in the present invention, in addition to the above, the abnormality of the adjustment data setting system may be directly confirmed on the screen. That is,
When detecting that the adjustment data is abnormal, the microcomputer 20 gives a read signal to the character display circuit 22, as shown in FIG. Character display circuit 22
Outputs character data such as "non-volatile raw memory failure" and displays it on the cathode ray tube via the matrix circuit 4. This allows the user to immediately know the failure location.

[Effects of the Invention] As described above, the present invention prevents the influence of the stored data value of the non-volatile memory or the non-volatile memory itself from directly appearing on the receiver, and It is possible to provide a self-diagnosis device for a television receiver that does not induce a new failure due to an abnormality.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an operation procedure of an embodiment of the present invention,
FIG. 2 is a block diagram of a television receiver to which the present invention is applied, and FIG. 3 is a block diagram of a conventional television receiver. 1 ... Analog-digital converter, 2 ... Video chroma processing circuit, 3 ... Digital-analog converter, 4 ... Matrix circuit, 5 ... Drive circuit, 6 ... Color cathode ray tube, 7 ... Synchronous deflection processing circuit , 8: deflection drive circuit, 20: microcomputer, 21: non-volatile memory, 22: character display circuit.

Claims (1)

[Claims] 1. A television receiver having a plurality of circuits to be adjusted, wherein operation means for giving arbitrary adjustment data to each of the circuits to be adjusted to control each of the circuits to be adjusted, and applying by the operation means. A non-volatile memory capable of storing the adjusted adjustment data, holding means for holding the standard operation data in order to control each of the circuits to be adjusted by the preset standard operation data, and when the power is turned on. Read the adjustment data from the non-volatile memory and determine whether the read data is within a predetermined range, and the result of the determination by the determination unit is that the read data value is within the predetermined range. In the case of, the adjustment data from the nonvolatile memory is supplied to each of the circuits to be adjusted, and when it is out of a predetermined range, the adjustment data from the nonvolatile memory Place of self-diagnosis system of the television receiver, characterized in that and means for controlling is supplied to each of the adjusted circuit standard operation data from said holding means.