Mp3 test: listen to the left and right speakers: no abnormal sound / no sound<br>Check RGB:<br>A. check the six RGB pictures under 25cm for bright spots, white spots, poor pictures, etc.<br>B. tap the LCD frame to check whether there is light transmission, water ripple and other defects (refer to LCD specifications)<br>C. in the black screen, hold the LCD on the top one-third of the LCD frame with your right hand and gently shake the LCD (LCD is turned to 90 ° ~ 120 °), pay attention to check whether there are bright lines, abnormal screen, etc.<br>Note: it is necessary to wait until the screen becomes full screen for testing. Click "P" to switch left and right speakers (listen to whether the speakers are abnormal & silent). Click "P" to switch to mute and click "P" pass<br>
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