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First clean the circuit board of the display with absolute alcohol to remove the dust, stains, mildew, rust and other substances in the circuit board, and then repair the areas that may be corroded or poor contact in the display.


Because the monitor is exposed to humidity, dust, high temperature and other environments, it will cause the internal circuit to short-circuit or form a conductor with a certain resistance value,small lcd screens，thereby destroying the normal operation of the circuit.


Note: After cleaning the circuit boards and other components, dry the circuit boards with hot air before they can be installed for testing.



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