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Image tube aging detection and activation method of CRT display

A technology for CRT monitors and kinescopes, applied in the field of kinescope aging detection and activation, can solve problems such as prone to misjudgment, achieve the effects of reducing misjudgment rate, avoiding misjudgment, and reducing maintenance costs

Inactive Publication Date: 2009-02-18
SHANGHAI MINHANG HIGH SCHOOL +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a CRT display tube aging detection and activation method, which mainly solves the technical problem that the existing detection and judgment methods are prone to misjudgment, and the aging of the picture tube can only be handled by replacing the picture tube, which not only reduces the maintenance cost, And simplifies the maintenance operation steps

Method used

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Embodiment Construction

[0019] The invention provides a picture tube aging detection and activation method of a CRT display, and the specific steps are as follows:

[0020] Step 1: Observe whether the brightness of the picture tube is not high when the voltage of each pole of the picture tube is normal, and whether there is a tailing phenomenon in the green image when the brightness and contrast are turned on; if so, go to step 2.

[0021] Step 2: Disassemble the casing of the display, unplug the tube holder of the picture tube, apply a rated voltage (usually 6.3V) to the filament, and connect the modulating electrode and the red test lead with the black test lead of the 1K block of the mechanical multimeter after 3 to 6 minutes Connect red, green, and blue cathodes respectively; when the resistance value of the test result is 1-5K, it is judged that the picture tube is normal, and other fault detection operations are performed; when the test result is blocked between 5-10K, it means that the picture ...

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Abstract

The invention relates to a CRT display, especially a method for detecting and activating kinescope ageing of a CRT display, the method comprises observing whether a smearing phenomenon is existed when the brightness of the kinescope is not high, then the brightness and the contrast are increased, under the condition that each pole voltage of the kinescope is normal; if the smearing phenomenon is existed, dismounting the casing of the display and pulling out a base of the kinescope, after applying rated voltage on the filament of the kinescope for 3-5 minutes, connecting a modulating electrode using a black meter pen of a mechanical multimeter 1K shift, connecting red, blue and green three electrodes respectively by the red meter pen; when the testing resistance value is between 5K and 10K, applying 8V-9V voltage on the filament, replacing 110V voltage with a power supply voltage of the TV set itself, electrifying for 3-8 minutes, reactivating one time after 10 minutes, the kinescope is recovered in normal immediately. The method can not only reduce the maintenance cost, but also simplify the maintenance operation steps.

Description

technical field [0001] The invention relates to a CRT display, in particular to a method for detecting and activating the aging of a picture tube of a CRT display. Background technique [0002] During the use of color CRT monitors, we often find this phenomenon: [0003] When the voltage of each pole of the picture tube is normal, the brightness of the picture tube is not high, and when the brightness and contrast are turned on, the image green has a tail. In this case, we will judge this phenomenon as the aging failure of the picture tube, and carry out the maintenance operation of the picture tube replacement. [0004] However, this approach has the following two drawbacks: [0005] 1. The above-mentioned failures may sometimes be caused by the weak welding of the imaging circuit. Therefore, it cannot be regarded as the aging of the imaging tube. [0006] 2. Carrying out the replacement operation of the picture tube after it is judged as the aging failure of the picture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/50G01R31/25
CPCY02W30/82
Inventor 项敏
Owner SHANGHAI MINHANG HIGH SCHOOL
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