How to judge the LCD TV screen is broken
Author:Lao Jiewei Time:2021-10-11 15:46 Browse(965)
The LCD screen of LCD is very fragile! The surface of the screen may be damaged if it is slightly forced by hand. We usually say that there are no more than two cases of screen failure. One is hard surface contusion. Such as surface scratch, broken screen, or liquid crystal overflow. It can't be fixed. This kind of screen is broken. There is no need to replace it with a new one. Because the price of one screen accounts for 80% of the total price of LCD, nearly 1000 yuan.
The LCD screen of LCD is very fragile! The surface of the screen may be damaged if it is slightly forced by hand.
generally speaking, there are only two cases of screen damage.
one is hard contusion on the surface.

How to judge the LCD TV screen is broken

for example, the surface is scratched.
the screen is broken There is no need to replace such a broken screen.
because the price of a screen accounts for 80% of the total price of LCD.
about 1000 yuan.

another kind of screen failure is internal damage.
we sometimes find it difficult to believe that the screen is really broken.
for example, there are some irregular horizontal or vertical lines on the image Some people say that my LCD is very careful.
it's always like a baby, and it's still on the table.
can't it be broken for no reason? In fact, although the screen itself is not affected by external force, it is broken.
why first remove the circuit board of the mechanism, and then open the metal guard behind the screen, I can see the full layout of the LCD screen. There are some on the top of the screen, and there are a circuit board on the right.
there are many integrated circuit blocks on it.
tubes, The resistance bar, the capacitance and the soft bar circuit are connected to the final interface of the screen by dense soft bar wires.
we call these circuits LCD driving soft bar circuits.
if we don't pay attention to it, once someone drags it down, it will be in dire straits.
it's just like repairing an electronic calculator.
we need to pay attention to itSome people tear down the soft layout of the screen, and that's the end. The driving circuit of the LCD screen is also called the driving circuit. Due to the different models of the LCD screen, each LCD screen has a different driving circuit, so the structure and the integrated circuit used are very different. All the signals are driven by these driving circuits, so the LCD screen can emit light normally, so the driving circuit of the screen is broken, The screen can't work normally. This is what we usually call a broken screen. Of course, when we repair it, the master will say; The LCD screen is broken! The so-called screen failure actually means that the driving part is burnt out, which is quite different from the previous kind of hard LCD screen failure caused by external force, Generally, the LCD maintenance personnel will use another screen to connect it during repair, which is verified by experiments.
unfortunately, the driving circuit of this screen is burnt out, which can not be repaired by ordinary maintenance personnel.
this kind of repair is only carried out in the factory that produces the LCD.
there are horizontal lines on the LCD screen.
there are splash screens and flickering on and off, which must be the LCD panel, The internal short circuit of the Y-axis of the liquid crystal glass or the ignition between the ITO poles causes the internal resistance change due to the ignition or short circuit of the circuit, which leads to the over-current or open circuit of the internal voltage VGH, VGL, VCOM of the liquid crystal screen and leads to the irregular protection of the DC-DC conversion circuit, causing the voltage instability, leading to the flower screen or flashing, and then the corresponding position of the horizontal line is usually short circuited or ignited, You can use a microscope to reverse the screen film. If there is a tab on the Y side, replace the tab. If there is no tab, you can only use the LCD laser machine to cut the short-circuit point with ignition or electrode short circuit by laser. In this way, it can generally be repaired. However, the bonder or LCD laser repair machine is used in these professional screen repair processes, There are more than 20000 to 40000 bonders in common use, and 230000 to 36000 LCD laser machines,Different prices have different values for performance and output. I use the cr-880sh bonder of Guangzhou Weicai, and then the LCD laser machine uses the cr-512d platform machine of Weicai electronics. I bought it three years ago, and it has been used well up to now. Weicai Electronics' after-sales service is also very good. Generally, if there is a small problem, we need professional technicians to follow up and deal with it, If you really want to explore the LCD maintenance project, you can first search the company on Baidu, and then go to the company to have a specific understanding. I hope it will be helpful to you. In addition, if you don't have professional LCD maintenance equipment such as bonder and laser machine, the LCD you mentioned can't be repaired, It is recommended that you get a company with professional equipment to repair it.

I hope the LCD screen adopting LCD is very fragile! The surface of the screen may be damaged if it is slightly forced by hand.
generally speaking, there are only two cases of screen damage.
one is hard contusion on the surface.
for example, the surface is scratched.
the screen is broken There is no need to replace such a broken screen.
because the price of a screen accounts for 80% of the total price of LCD.
about 1000 yuan.

another kind of screen failure is internal damage.
we sometimes find it difficult to believe that the screen is really broken.
for example, there are some irregular horizontal or vertical lines on the image Some people say that my LCD is very careful.
it's always like a baby, and it's still on the table.
can't it be broken for no reason? In fact, although the screen itself is not affected by external force, it is broken.
the screen is brokenSo why first remove the circuit board of the mechanism, and then open the metal guard behind the screen, I can see the full layout of the LCD screen. There are some on the top of the screen, and there are a circuit board on the right.
there are many integrated circuit blocks on it.
tubes, The resistance bar, the capacitance and the soft bar circuit are connected to the final interface of the screen by dense soft bar wires.
we call these circuits LCD driving soft bar circuits.
if we don't pay attention to it, once someone drags it down, it will be a disaster.
it's like repairing an electronic calculator.
if someone drags the soft bar of the screen down, it's over, LCD driving circuit is also called driving circuit. Due to different LCD models, each LCD has a different driving circuit, so the structure and integrated circuit used are different. All signals are driven by these driving circuits, so the LCD can emit light normally. If the driving circuit of the LCD is broken, the screen can not work normally, This is what we usually call a broken screen. Of course, when we repair it, the master will say it; The LCD screen is broken! The so-called screen failure actually means that the driving part is burnt out, which is quite different from the previous kind of hard LCD screen failure caused by external force, Generally, the LCD maintenance personnel will use another screen to connect it during repair, which is verified by experiment.
unfortunately, the driving circuit of this kind of screen is burnt out, which can't be repaired by ordinary maintenance personnel.
this kind of repair is only carried out in the factory that produces LCD.
.
this kind of repair can't be repaired
Related topics