Hangzhou Xuhong Technology Co.,Ltd
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1、 Defective analysis details
Defective serial number | Model | Code | Customer complaints of adverse phenomena | Our company's re judgment phenomenon | Bad reasons |
1# | PC070NE93-C | 231007TTS2400110 | blurred screen | blurred screen | Pollution corrosion |
2# | 230531TTS2400922 | blurred screen | blurred screen | Pollution corrosion | |
3# | 240422TTS2400931 | Black screen | Good product | ||
4# | PC043TN25-B9.3 | 240421LZK0900697 | Black screen | Good product | |
5# | 240227LZK0900104 | white screen | white screen | Electrostatic injury |
1、Analysis of Adverse Causes
Defective module 1 #/2 # retested as a flower screen, with a large amount of residual pollution on the surface of the module,
as shown in the following figure:
Summary: The retest of the 2PCS defective module showed a flower screen, and a large amount of residual pollution was visible
on the surface of the module and FOG.
Further confirm the cause of the defect under OM:
Severe corrosion in the binding area
Summary: Under OM, it can be seen that the COG binding area is severely contaminated, resulting in corrosion of all lines and leading to screen defects。
2. Defective module 3 #/4 # customer complaint black screen, our company lights it up and retests it to display normally:
4# |  |  |  |
Can light up normally when powered on | The solder joints are full, and there are no open or short circuits in the wiring | ||
3# |  |  |  |
Summary: Customer complaint: Both PCS modules can light up normally, and the solder pads and wiring are checked for abnormalities
1. Defective module 5 # retested as white screen:
 | |  |  |
Power on display shows a white screen | COG binding is good | ||
 |  |  | |
FOG binding has no abnormalities | |||
Summary: The defective module displayed a white screen when powered on, and the COG/FOG binding effect was good under OM microscopy, with no abnormal binding observed.
IC replacement verification: The display effect is normal after replacing the IC;
Power on display is normal
Summary: After replacing the new IC, the display effect is normal when powered on; Preliminary inference is that the white screen was damaged by static electricity during use.
