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Open the case and look at the screen is Chi Mei V260B1-L11, the logic board and the screen as one. The owner responded earlier and asked someone to fix it. He said that without accessories, he would put it back. It is true that there has been no movement, and the screen has not been removed.
Open the screen, measure the normal VGH/VGL voltage on the side panel, no problem, try to adjust the VCOM potentiometer, the image has light and dark changes, indicating that the boost circuit should be normal, and the image is flicked by the COF on the screen. The main chip on the logic side board and the gamma circuit. The gamma chip is EC48324-FV, and no PDF data can be found. Only replace it.
A piece of V260B1-XC11 side plate was purchased from Ma Yun, and the chip was replaced. The image of the power-on test machine was normal. Measure the voltage of the damaged chip and the normal chip as follows:
1, 2, 3, 5, 6, 7 foot fault voltage 10V, normal voltage 5.5V;
8, 9 and 10 feet voltage 4V, the same when normal;
12, 13, 14 foot fault voltage 13V, normal voltage 8.5V;
The 4-pin power supply is 13.5V, unchanged, and the 11-pin grounding.
If the competitor encounters such a fault, the voltage of the chip can be roughly judged to be damaged.
For reference only, thank you!