Yude YDIT professional analysis LCD display repair various detection methods advantages

Source:YDIT 誉德 Release time:2019/6/11 14:01:09 Views:939

 

LCD screen (paperless conference system, ultra-thin one lifter, LCD screen lifter) not only has high definition, but also has a very good vertical texture, so it has become the mainstream of modern electrical products industry, but liquid crystal display (paperless conference system) , ultra-thin one lifter, LCD screen lifter) If the use process is not proper, it is easy to cause damage, and what is the problem with the damaged display? This requires some common detection methods for testing. What are the common detection methods for liquid crystal display (paperless conference system, ultra-thin one lifter, LCD screen lifter)?

LCD display (paperless conference system, ultra-thin integrated lift, LCD screen lifter) maintenance commonly used detection methods:

1, short circuit detection method:

Adjust the multimeter to the short-circuit detection block (generally with an alarm function, such as a beep when it is turned on), to detect whether there is a short circuit phenomenon, and immediately after the short circuit is found, the short circuit phenomenon is also the most common display module failure. Some can be found by observing the ic pin and the pin header. Short-circuit detection should be performed in the event of a power failure to avoid damaging the multimeter. This method is the most commonly used method, simple and efficient. 90% of the faults can be detected by this method.

2, resistance detection method:

Adjust the multimeter to the resistance file, check the resistance value of a certain point on the normal circuit board, and then test whether the same point of the same circuit board is different from the normal resistance value. If it is different, it is determined. The scope of the problem.

3, voltage detection method:

Adjust the multimeter to the voltage file to detect the ground voltage at a certain point of the circuit suspected of having a problem, and compare whether it is similar to the normal value. It is convenient to determine the range of the problem.

4, pressure drop detection method:

Adjust the multimeter to the diode drop detection file, because all ic are composed of a basic number of single-element components, but are miniaturized, so when there is current on one of its pins, it will exist on the pin. Voltage drop. Generally, the voltage drop on the same pin of the same type of ic is similar. According to the voltage drop value on the pin, it is necessary to operate under the condition that the circuit is powered off.

Only through the above method to detect the end of the liquid crystal display (paperless conference system, ultra-thin integrated lift, LCD lifter) is a problem, so that the next maintenance can be carried out