Now we're using basically lcd tvs, which are displays of lcds, different from the previous catheters, and the picture is much clearer and more live. So the lcd tv is different from where it used to be. Today we're going to give you a brief introduction to the common sense of lcd maintenance. In order to understand the common sense of lcd maintenance, we would like to begin with the diagnosis and maintenance of frequent lcd failures. This will facilitate subsequent maintenance work。
Lcd tvs often have flash screens, that is, when they turn on, the screen closes. But all the other functions are normal, like sound, remote buttons, etc. Most of this is due to the disruption of protected circuits of backlights on liquid crystal screens and may be due to abnormal voltage of backlights. Because the most important and valuable component of the lcd monitor is the monitor, the protection of circuits is added. There are two main methods of trouble removal and maintenance, one of which is to check the backlight pressurized plugs, if the connection is normal, there's a welding place on it. Two is not plugged in, plugged in on it。
And there's no change when the lcd tv is on, and everything else is normal: sound, remote control, etc. This failure requires the following judgement. First, the electricity voltage of the backlight circuits is checked, which can be caused by the abnormality of the voltage. The average screen is 24v, the screen is 12v, and the television instructions are marked. The second is to check the backlight switch to control the signal, whether it is activated to the high level and whether the signal waveform is normal. The general replacement of the presses is sufficient, the failure of the presses cannot be ruled out and multiple backlights fail。
There are also screens when the lcd television is on, and there are two ways to determine this failure. The first is to check whether the contact on the panel is normal and, if it is not normal, weld the place. The second is whether there is any poor exposure on tv. The maintenance methods are the same as above. If the television sets do not show or sound, the backlights and sound systems are checked, and the malfunctions are gradually judged and then resolved. The failure of the power lamp after the start-up may be either a failure of the power plate or a failure of the cpu before it is judged appropriate for replacement or maintenance。
These are some of the most common small failures of lcd television, and they are easy to judge, and they can be judged if they have current gauges. However, electrical operations must be cut during the maintenance exercise in order not to penetrate circuit boards. So it's better to have a professional maintenance worker。
