CN112542116A - Method for rapidly positioning display fault of TCONLESS liquid crystal display television - Google Patents
Method for rapidly positioning display fault of TCONLESS liquid crystal display television Download PDFInfo
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- CN112542116A CN112542116A CN202011476657.7A CN202011476657A CN112542116A CN 112542116 A CN112542116 A CN 112542116A CN 202011476657 A CN202011476657 A CN 202011476657A CN 112542116 A CN112542116 A CN 112542116A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/004—Diagnosis, testing or measuring for television systems or their details for digital television systems
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Abstract
The invention relates to a fault positioning technology in the field of liquid crystal televisions, discloses a method for rapidly positioning a display fault of a TCONLESS liquid crystal television, and solves the problem that the maintenance efficiency of the conventional TCONLESS liquid crystal display is low. The invention defines different numerical values for different faults of the TCON circuit of the liquid crystal television and stores the numerical values to the position of the fixed register of the TCON chip. After entering a display fault diagnosis process, the core board generates data1 data according to the level record of the lock signal fed back by the screen end in real time, reads the register value in the TCON circuit chip through the IIC bus, records and generates data2 data, and can accurately reflect whether the liquid crystal television has a display fault and which part of circuits have faults by combining the data1 data and the data2 data. Therefore, when a maintenance worker takes the fault machine, the data1 data and the data2 data can be called out, and fault inquiry is carried out according to the specific circuit fault position corresponding information table, so that the fault is quickly positioned, the television maintenance efficiency is improved, and the maintenance cost is reduced.
Description
Technical Field
The invention relates to a fault positioning technology in the field of liquid crystal televisions, in particular to a method for rapidly positioning a display fault of a TCONLESS liquid crystal television.
Background
With the development and progress of the technology of the liquid crystal television industry, the TCON module carried by the original liquid crystal screen end is gradually integrated to a TV core main board, the original TCON chip is cancelled, and the SOC of the core outputs image display data and TCON time sequence control signals. The image data is directly transmitted to a liquid crystal source chip (source signal) to display an image. The TCON time sequence control signal obtains various time sequence levels required by the liquid crystal screen switch through a driving circuit on the TCON module, and the various time sequence levels are transmitted to a GOA unit circuit (grid signal) of the liquid crystal screen to open the liquid crystal glass. The two ensure the normal display of the picture image of the liquid crystal television together. The liquid crystal television adopting the signal processing mode is a tconless liquid crystal television.
Because the tconless liquid crystal television transfers the TCON driving circuit from the original liquid crystal display factory to the television factory, when the problem of abnormal display failure is faced, television maintenance personnel are difficult to avoid, and it is difficult to distinguish whether the failure comes from the screen end, the TCON driving circuit or the core circuit or other positions. Even if the TCON drive fault is located, the fault source is difficult to comb out when a plurality of groups of complex integrated circuits are faced, because most power management chips of the TCON drive can shut down all outputs when one group of the outputs has a fault due to the protection of the liquid crystal screen. The abnormal display fault is the most common fault of the liquid crystal display television, so the problem of low maintenance efficiency of the tconless liquid crystal display television always restricts the production efficiency of a manufacturing end and the maintenance efficiency of an after-sale client.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a method for rapidly positioning a display fault of a TCONLESS liquid crystal display television is provided, and the problem that the maintenance efficiency of the existing TCONLESS liquid crystal display problem is low is solved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for rapidly positioning a display fault of a TCONLESS liquid crystal television comprises the following steps:
A. after the liquid crystal television is powered on and started up each time to complete a self-checking program, automatically entering a display fault diagnosis process;
B. the movement software reads the lock signal fed back by the screen end in real time, records the data1 and stores the data in the movement memory;
C. the core software reads the state bit register value of the power management chip of the TCON driving part through the IIC bus, records data2 data and stores the data in the core memory;
D. when the liquid crystal television is in a normal networking state, the movement software automatically uploads the data1 and the data2 to a corresponding database;
E. when maintenance personnel position the fault display of the fault machine, data1 data and data2 data of the fault machine are called from a corresponding database, or a serial port tool is used for reading data of a machine core memory on line through an IIC bus, and then fault inquiry is carried out through pre-established data1 and data2 numerical values and a specific circuit fault position corresponding information table.
As a further optimization, the method further comprises, before step a:
a0, pre-establishing a fault position corresponding information table of data1 and data2 values corresponding to specific circuits.
As a further optimization, the data1 data at least comprises 1-bit binary data, and the data content thereof is: 1, indicating that the lock fed back by the liquid crystal screen end is high level, and showing that the source chip at the screen end can normally receive and identify display data; and 0 represents that the lock fed back by the liquid crystal screen end is at low level, which indicates that the source chip at the screen end cannot receive effective display data or the received data is wrong and cannot be correctly identified.
As a further optimization, the data2 data is predefined in the power management chip of the TCON driving part and comprises N-bit binary data, and the data content of the data comprises TCON driving key parameters which can cause abnormal picture display, wherein N is more than or equal to 1.
As a further optimization, the TCON driving key parameters that may cause abnormal screen display specifically include: VCC3.3, VCORE, AVDD, VGH, VGL, OCP, OTP and Power Sequence.
As a further optimization, the state bit register value of the power management chip of the TCON driving part is automatically detected, updated and stored by the power management chip driven by the TCON every time the TCON driving circuit is powered on.
As a further optimization, in step E, the data1 data and data2 data of the fault machine are called out from the corresponding database through the unique code of the body of the fault machine.
The invention has the beneficial effects that:
the invention defines different numerical values for different faults of the TCON circuit of the liquid crystal television and stores the numerical values to the position of the fixed register of the TCON chip. After entering a display fault diagnosis process, the core board generates data1 data according to the level record of the lock signal fed back by the screen end in real time, reads the register value in the TCON circuit chip through the IIC bus, records and generates data2 data, and can accurately reflect whether the liquid crystal television has a display fault and which part of circuits have faults by combining the data1 data and the data2 data. Therefore, when a maintenance worker takes the fault machine, the data1 data and the data2 data can be called out, and fault inquiry is carried out according to the specific circuit fault position corresponding information table, so that the fault is quickly positioned, the television maintenance efficiency is improved, and the maintenance cost is reduced.
Drawings
Fig. 1 is a flowchart of a method for rapidly positioning a display fault of a TCONLESS lcd tv in an embodiment of the present invention.
Detailed Description
The invention aims to provide a method for rapidly positioning a display fault of a TCONLESS liquid crystal display television, which solves the problem of low maintenance efficiency of the conventional TCONLESS liquid crystal display. In particular implementation, the method for rapidly positioning the fault comprises the following steps: A. after the liquid crystal television is powered on and started up each time to complete a self-checking program, automatically entering a display fault diagnosis process; B. the movement software reads the lock signal fed back by the screen end in real time, records the data1 and stores the data in the movement memory; C. the core software reads the state bit register value of the power management chip of the TCON driving part through the IIC bus, records data2 data and stores the data in the core memory; D. when the liquid crystal television is in a normal networking state, the movement software automatically uploads the data1 and the data2 to a corresponding database; E. when maintenance personnel position the fault display of the fault machine, data1 data and data2 data of the fault machine are called from a corresponding database, or a serial port tool is used for reading data of a machine core memory on line through an IIC bus, and then fault inquiry is carried out through pre-established data1 and data2 numerical values and a specific circuit fault position corresponding information table.
The data meanings of the data1 and data2 are predefined, the data1 can reflect the high and low levels of the lock signal, and the data2 can reflect whether the TCON driving key parameter which can cause the abnormal picture display is abnormal or not.
Based on the scheme, when the tconless liquid crystal display television has a display fault, a maintenance worker can quickly judge whether the fault point is abnormal in core signal processing or abnormal in TCON driving level, and the TCON driving fault can be quickly positioned to a specific part of an abnormal circuit, so that the product maintenance quality is ensured, the maintenance cost is reduced, and the product maintenance efficiency is improved.
Example (b):
the flow of the fault location method in this example is shown in fig. 1, and includes:
step 1: after the liquid crystal television finishes the routine self-checking program, automatically entering a display fault diagnosis process;
the self-checking program of the liquid crystal television can be started every time the liquid crystal television is powered on. And if the self-checking is passed, the liquid crystal television can normally work. If the self-checking fails, the core board needs to be maintained until the self-checking is passed.
Step 2: the movement software reads a lock signal fed back by the screen end in real time, records data1 and stores the data in a preset position 1 of a memory;
and step 3: the core software reads the state bit register value of the power management chip of the TCON driving part through the IIC bus, records data2 and stores the data in a preset position 2 of a memory;
and 4, step 4: if the fault function is normally networked, the movement software automatically uploads the data1 and the data2 to corresponding databases.
After the maintenance personnel take the fault machine, the data1 and the data2 can be called out from the database through the unique code of the liquid crystal television body. If the database does not contain the data1 and the data2, a maintenance worker can use a serial port tool to read data of the movement memory on line through the IIC bus. And then fault inquiry is carried out through a pre-established data1 and data2 numerical value and a specific circuit fault position corresponding information table.
The data1 and data2 have the following meanings:
data1 contains at least 1-bit binary Data: 1-lock is high level; 0-lock is low.
Data1 is 0, which indicates that the source chip at the screen end fails to receive valid display Data, or the received Data is wrong and can not be correctly identified. The maintenance personnel need to check the connection between the core board and the liquid crystal screen, or the core part has a fault and needs to be maintained.
Data1 is 1, which shows that the source chip at the screen end can normally receive and identify the display Data, the fault point points to the TCON drive, and at this time, the Data2 needs to be further viewed.
Data2 contains 8-bit binary Data, defined as follows for example
And the maintenance personnel reversely checks the preset fault corresponding value through the register value to judge whether the TCON drive is normal. If the circuit is abnormal, the specific data value is used for judging which part of the circuit is in fault.
If the read data2 data is 10000100, which corresponds to the above table, it indicates that the AVDD is abnormal, and a maintenance person needs to mainly check the AVDD part of the circuit in the TCON drive;
if the read data2 is 00010000, which corresponds to the above table, it indicates that both the VGL voltage and the power-on timing have problems, and the maintenance personnel need to mainly check the VGL circuit and the related timing control circuit in the TCON drive.
Through the data analysis of the data1 and the data2, maintenance personnel can quickly position the fault direction, further accurately judge the fault for maintenance, and achieve the purpose of quick and efficient maintenance.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure.
Claims (7)
1. A method for rapidly positioning a display fault of a TCONLESS liquid crystal television is characterized by comprising the following steps:
A. after the liquid crystal television is powered on and started up each time to complete a self-checking program, automatically entering a display fault diagnosis process;
B. the movement software reads the lock signal fed back by the screen end in real time, records the data1 and stores the data in the movement memory;
C. the core software reads the state bit register value of the power management chip of the TCON driving part through the IIC bus, records data2 data and stores the data in the core memory;
D. when the liquid crystal television is in a normal networking state, the movement software automatically uploads the data1 and the data2 to a corresponding database;
E. when maintenance personnel position the fault display of the fault machine, data1 data and data2 data of the fault machine are called from a corresponding database, or a serial port tool is used for reading data of a machine core memory on line through an IIC bus, and then fault inquiry is carried out through pre-established data1 and data2 numerical values and a specific circuit fault position corresponding information table.
2. The method of claim 1, wherein the TCONLESS LCD TV display failure fast positioning method,
the method further comprises, before step a:
a0, pre-establishing a fault position corresponding information table of data1 and data2 values corresponding to specific circuits.
3. The method of claim 1, wherein the TCONLESS LCD TV display failure fast positioning method,
the data1 data at least comprises 1-bit binary data, and the data content is as follows: 1, indicating that the lock fed back by the liquid crystal screen end is high level, and showing that the source chip at the screen end can normally receive and identify display data; and 0 represents that the lock fed back by the liquid crystal screen end is at low level, which indicates that the source chip at the screen end cannot receive effective display data or the received data is wrong and cannot be correctly identified.
4. The method of claim 1, wherein the TCONLESS LCD TV display failure fast positioning method,
the data2 data is predefined in the power management chip of the TCON driving part and comprises N-bit binary data, and the data content of the data comprises TCON driving key parameters which can cause abnormal picture display, wherein N is more than or equal to 1.
5. The method of claim 4, wherein the TCONLESS LCD TV display failure fast positioning method,
the TCON driving key parameters that may cause abnormal screen display specifically include: VCC3.3, VCORE, AVDD, VGH, VGL, OCP, OTP and Power Sequence.
6. The method of claim 1, wherein the TCONLESS LCD TV display failure fast positioning method,
the TCON drive part power management chip status bit register value is automatically detected, updated and stored by the power management chip driven by the TCON every time the TCON drive circuit is electrified.
7. The method for rapid location of display failure of TCONLESS LCD TV set as claimed in any of claims 1-6, wherein in step E, the data1 data and data2 data of the failed machine are called from the corresponding database by the unique code of the body of the failed machine.
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| CN202011476657.7A CN112542116A (en) | 2020-12-14 | 2020-12-14 | Method for rapidly positioning display fault of TCONLESS liquid crystal display television |
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| CN202011476657.7A CN112542116A (en) | 2020-12-14 | 2020-12-14 | Method for rapidly positioning display fault of TCONLESS liquid crystal display television |
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