LCD screen repair case series
40 inch Qimei (Figure 1) image half black screen (Figure 2) malfunction
After booting up, the upper half of the screen is black, while the lower half displays basically normally (Figure 2, Figure 3)
From this, it can be determined that the power supply to the y-axis TAB is abnormal. The multimeter shows that there is no VGH supplying power to y1, while the other channels are supplying power to Y1 normally. Analysis shows that Y1 (TAB) is damaged,
After replacing y1 (TAB), the power supply voltage to Y1 and y2 was tested and found to be normal. The image on the screen was displayed normally (Figure 4), and the fault was resolved.
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