One of the common failures of LCD screens in our lives is the fading, so let me introduce the faults of LCD fading today!
1) General description of the phenomenon of flower screen failure: There is an image on the screen, but the image is covered with noise such as dots, flakes, and mosaics.
Corresponding to the maintenance direction: check the signal source, logic board, LVDS signal, main board, screen parameters, LCD screen. 2) Fuzzy screen failure phenomenon: The user menu is normal, but the image is fuzzed.
Corresponding repair ideas: check the motherboard and scaler processing chip circuit, repair the chip.
3) Fuzzy screen failure phenomenon: Fuzzy screen from time to time, there are many small color dots in the image in the middle of the screen.
Corresponding repair ideas: LVDS plug-in connection is poor.
4) Flower screen failure phenomenon: After repeated power-on, the stripes and colors of the flowers change.
Corresponding repair ideas: check the logic board
5) Flower screen failure phenomenon: After repeated power-on, the stripes and color of the flower remain unchanged.
Corresponding maintenance ideas: The screen itself has a high chance of failure.
6) Fuzzy screen failure phenomenon: The image has interference, and there is also interference on the characters.
Corresponding maintenance ideas: logic board, screen signal connection, digital board signal output circuit.
7) Fuzzy screen failure phenomenon: the characters are normal, and the image has blocky and dot interference. YPbPr input signal, no interference. Then input from the AV port, the image appears interference.
Corresponding maintenance ideas: false welding of frame memory, image enhancement processing IC control signal line is broken.
8) Fuzzy screen failure phenomenon: The images are all dotted, finely broken screens, and the characters are normal.
Corresponding repair ideas: The fault lies in the video decoder circuit. Because the faults generated by the image enhancement processing circuit are blocky, not finely divided.
9) Fuzzy screen failure phenomenon: there is distortion or netting interference on the image. AV test machine everything is normal.
Corresponding maintenance ideas: medium and high amplifier circuits.
10) Fuzzy screen failure phenomenon: The image is regular blocky fuzzing.
Corresponding repair ideas: poor communication between the motherboard cache and the main chip.
1) General description of the phenomenon of flower screen failure: There is an image on the screen, but the image is covered with noise such as dots, flakes, and mosaics.
Corresponding to the maintenance direction: check the signal source, logic board, LVDS signal, main board, screen parameters, LCD screen. 2) Fuzzy screen failure phenomenon: The user menu is normal, but the image is fuzzed.
Corresponding repair ideas: check the motherboard and scaler processing chip circuit, repair the chip.
3) Fuzzy screen failure phenomenon: Fuzzy screen from time to time, there are many small color dots in the image in the middle of the screen.
Corresponding repair ideas: LVDS plug-in connection is poor.
4) Flower screen failure phenomenon: After repeated power-on, the stripes and colors of the flowers change.
Corresponding repair ideas: check the logic board
5) Flower screen failure phenomenon: After repeated power-on, the stripes and color of the flower remain unchanged.
Corresponding maintenance ideas: The screen itself has a high chance of failure.
6) Fuzzy screen failure phenomenon: The image has interference, and there is also interference on the characters.
Corresponding maintenance ideas: logic board, screen signal connection, digital board signal output circuit.
7) Fuzzy screen failure phenomenon: the characters are normal, and the image has blocky and dot interference. YPbPr input signal, no interference. Then input from the AV port, the image appears interference.
Corresponding maintenance ideas: false welding of frame memory, image enhancement processing IC control signal line is broken.
8) Fuzzy screen failure phenomenon: The images are all dotted, finely broken screens, and the characters are normal.
Corresponding repair ideas: The fault lies in the video decoder circuit. Because the faults generated by the image enhancement processing circuit are blocky, not finely divided.
9) Fuzzy screen failure phenomenon: there is distortion or netting interference on the image. AV test machine everything is normal.
Corresponding maintenance ideas: medium and high amplifier circuits.
10) Fuzzy screen failure phenomenon: The image is regular blocky fuzzing.
Corresponding repair ideas: poor communication between the motherboard cache and the main chip.
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