After repairing an AOC 26-inch LCD TV, the phenomenon is that the image is very light, the still image is basically normal, the moving image is severely tailed, and the image response is very slow. Initially estimate the fault on the logic board or the screen is broken.
After disassembling the Machine , there is no special logic board. The logic board and the screen are connected together, and the logic circuit is made on the side panel of the screen. Carefully remove the front frame of the TV and remove the front iron frame of the screen. After power-on, test 3.3V, 5V, -5V, +21V on the PCB board are normal. It seems that the logic board V260B2-P01 is basically working properly.
Look closely at the fault phenomenon again. It feels that the VGH voltage of the logic board does not reach the gate drive cof of the screen or the VGH voltage that reaches the G pole drive cof is not enough. That is to say, the VGH trace of the glass substrate of the liquid crystal panel TPT260B2-L01 is broken or the internal resistance of the trace becomes large. The phone tells the customer that the TV is bad for the LCD screen, or the TV is scrapped, or I try to fix it. If you can fix it, you will receive the orange grandfather. If it is not repaired, the TV will be scrapped. The customer readily agrees.
Power on again, carefully test the G-drive cof circuit on the side of the screen and observe carefully. The point at the 3rd to the left of the cof is the VGH test point. Power off, solder the wire with the speaker voice coil at this point, and then connect to the VGH end of the logic board through a 1K resistor. Test machine, troubleshooting. This is written by personal experience. If there is something wrong, welcome peer criticism. I want you to write your LCD screen repair method and share it with you!
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