Precautions for application of outdoor LCD products

by:Genyu     2019-11-25
We all know that the large-screen outdoor LCD is very troublesome in maintenance, but as long as the cleaning skills are carefully summarized, the maintenance of the outdoor LCD will become very easy, general users should use cotton cloth to wipe the outdoor LCD large screen with clean water, and do not use any detergent, otherwise the shell will lose its unique luster when leaving the factory. First, deal with the protective film, and stick a protective film on the surface of the finished module to prevent the display surface from being stained during assembly, so it shall not be removed before the Assembly of the whole machine is finished, so as not to stain or damage the display surface. Second, add a pad between the module and the front panel. About 1mm pad, the panel should also be kept flat to avoid distortion after assembly. Three, strict anti-static module control, drive circuit is a low-voltage, micro-power CMOS circuit, easy to be electrostatic breakdown, electrostatic breakdown is an irreparable damage, must pay attention to, not careless. Therefore, in the operation, assembly and use should be extremely careful, to be strict anti-static. For this reason: 1. Do not touch the outer lead, circuit and IC on the circuit board at will; 2. The soldering iron used for welding must be well grounded and there is no leakage. 3. If you must touch directly, you should make the human body and the module well grounded, or contact the hand with the faucet or the metal frame of the console to discharge. 4. Precautions during assembly operation 1. The liquid crystal module is carefully designed and assembled. Please do not process or trim it yourself; 2. The metal frame claws shall not be twisted or disassembled at will; Do not modify and process PCB board shape, Assembly holes, circuits and components at will; Do not modify the conductive strip at will; Do not modify any internal brackets; Do not touch, fall, fold, twist modules and backlight parts; 3. The four mounting holes must be grounded to prevent electromagnetic interference and external noise. 5. When soldering, soldering the outer lead of the module and the interface circuit, it shall be carried out according to the following provisions: 1. If the connection between the liquid crystal module and other peripheral circuits needs to be soldered or the original connector is changed, please confirm that the LCD module has passed the quality inspection in advance; 2. Soldering iron temperature: 280 10 C; Welding Time: <3 ~ 4S; Welding material: eutectic, low melting point; Repeated welding shall not exceed 3 times. 3. Never physically damage the LCD screen and PCB, otherwise it will not be repaired. 4. Do not let the solder drop on the circuit board of the LCD screen when soldering, otherwise the screen display will be abnormal due to short circuit. Six, the use and maintenance of the module 1, the external lead of the liquid crystal module must not be connected incorrectly, otherwise it may cause overcurrent, Overvoltage and other damage to the components of the liquid crystal module; 2. When the module uses the power supply and disconnects the power supply, it must be in the positive power supply (5 ± 0. 25 V)After stable access, the signal level can be input. If the signal level is input before or after the power supply is stabilized, circuits such as IC in the module may be damaged. 3. The contrast and viewing angle of the dot matrix liquid crystal module are closely related to the temperature and driving voltage. Therefore, if VEE is adjusted too high, it will not only affect the display, but also shorten the service life of the module. 4. When the module is used below the specified working temperature range, the display response is very slow, while when the module is used above the specified working temperature range, the entire display surface will show a full display state, this phenomenon is not that the module is damaged, just return to the specified temperature range, everything will return to normal. ( It should not be used or stored beyond the storage limit temperature. If the temperature is lower than the crystallization temperature, the liquid crystal will crystallize, destroy the directional layer and scrap the device; If the temperature is too high, the liquid crystal will become isotropic liquid, lose the liquid crystal state, and lose the function of the liquid crystal device. ) 5. Pressing the display part hard will produce abnormal display. At this time, the power supply is cut off, wait a moment, and power on again, that is, it will return to normal. 6. Do not knock against the IC on the PCB board on the back of the module to prevent short circuit of adjacent pins. 7. When there are water droplets on the screen, wipe them off quickly: contact with water droplets for a long time will cause discoloration or spots on the screen. 8. When there is a stain on the screen, wipe it quickly with absorbent cotton or other soft cloth.
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