What are the components that are prone to malfunction in a flat panel monitor

Processing methods

First, the LCD fault more or high pressure board. After the problem of high pressure plate, the phenomenon of failure is generally divided into 2 kinds.

1, the lamp can light up, soon will not light;

2, the lamp is not light at all. For both of these failures, you can repair the High-voltage plate or directly replace the high-voltage plate. Maintenance should pay attention to is part of the display of the lamp line open, the lamp is broken or aging will also appear to be able to light up, soon did not work.

Second, the VGA line bad, resulting in color or machine does not work, directly replace the VGA line. Before replacing the line, the pin of the original line is measured clearly so that the line can be replaced quickly.

Third, the driver board is bad, generally do not boot, or boot can not work properly. The driver board is bad, which is roughly divided into main chip bad, MCU bad or data loss, power supply circuit is bad and so on. General drive board broken, repair more trouble, mainly parts and data software is not easy to find, general power supply circuit can repair MCU bad or data loss some models can be rewritten software data to solve, but still a lot of monitors can't write (software can't find), how to do? In this case, a substitute board or a general-purpose board is generally available.

Four, the built-in power supply is bad, mainly is not the output voltage or the output voltage cannot carry the load. The power supply bad better repair, generally first check the output section has no voltage output. If there is, the AC circuit is basically no problem, to check the DC circuit. Protection circuit problems, the filter circuit open or capacitor failure, rectifier diode bad and so on. The output part does not have the voltage output, first checks the rear level load to have short circuit. There is a short-circuit first disconnect short-circuit circuit, see the voltage is not normal. If the back-level circuit does not short-circuit, it is necessary to check the Exchange section, from the AC 220V to the bridge heap, after the rectification filter to get 300V DC, 300V to the back-level switch tube to the power management IC circuit, one by one.

Five, the screen is bad, generally has the following kinds of situations:

1, flower screen vertical color strips or cog, Tab bad;

2, screen or black screen;

3, bright line, bright belt, dark lines, black and black spots;

4, backlight paper, bad polarizing film back plate scratch. The probability of this failure is not very high, and most of the 1 and 32 cases require an LCD replacement.