Fault analysis; The common black screen faults in the upper and lower sections or
parts are caused by abnormal Y power supply. The specific fault manifestations are
horizontal black stripes or black screens in the upper and lower sections. The specific
range of manifestations varies depending on the number of Y-axis and the fault section.
Common fault points include:;
① Corresponding to damage to the Y-axis COF, this type of fault will manifest as a
black stripe or half black stripe on the screen, which can be resolved by replacing the
corresponding COF.
② The previous Y-axis COF was damaged, and the Y-axis power supply method is
edge board/X1/Y1/Y2/Y3. Taking the above figure as an example, Figure 2 shows a
black screen in the Y2 area. When detecting the Y-axis voltage, it is necessary to first
check whether the Y2 voltage is normal. If it is not normal, the possibility of Y2 damage
is unlikely, and then detect Y1. Y1 is divided into input and output semiconductor,
which can cause the detection of abnormal output. If the output terminal is abnormal,
Y1 needs to be replaced to repair it.
③ Y power supply circuit breaker, this fault is caused by a power supply circuit breaker
between Y1 and Y2. After the screen is turned on for a period of time, the upper part
can also light up, but the response is slow. To deal with this fault, simply fly the wire from Y1 to Y2.
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