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2.3 LCD display does not display
Fault phenomenon one: after power on, LCD display screen appears "white screen" or "flower screen" phenomenon;
Fault analysis: according to the phenomenon of fault, eliminate the problem that the backlight can not be lit normally, the reason should be that there is no data input or LCD is not connected to the power supply. First, check if there is a problem with the power supply. The LCD input data RGB was measured by oscilloscope, and no abnormality was found. However, another input pin was found to have no signal. After further examination, it was confirmed to be Shift Clock signal.
Solution: Use multimeter to measure and find that the connection is not connected, and then power on the LCD display is normal.Fault phenomenon two: after the power, LCD display by the "flower screen" to "black screen", or by the "white screen" to "black screen";
Fault analysis: the reason why this fault occurs is that the LCD backlight has been lit normally, but there is no signal input, or the input signal is incorrect. This fault is usually due to the choice of LCD type jumper on the motherboard or display card is not set correctly, or due to some control leads caused by obstruction; In addition, the signal connection error will also send this kind of fault, but the probability of this situation is relatively low, unless there is a mismatch problem in the process of LCD connection;
Treatment scheme: as long as the maintenance personnel slightly check, you can determine the location of the fault, and then targeted for troubleshooting.
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