A. The entire board does not light 1. Check whether the power supply and signal lines are connected.
2. Check whether the test card recognizes the interface. The red flashing of the test card is not identified. Check whether the light board is in the same power source as the test card, or whether the light board interface is short-circuited to the ground and the interface cannot be identified. (Smart Test Card)
3. Check whether the 74HC245 is short-circuited by a short circuit or not, and whether the corresponding input/output pin of the 245 signal is pinned or short-circuited to other lines.
Note: Mainly check the power and enable (EN) signals.
B. During point-sweep scanning, the regular interlaced display screen is not overlapped. 1. Check if the A, B, C, and D signal input ports are disconnected to 245 or they are short-circuited.
2. Check whether the 245 corresponding A, B, C, D output terminals and 138 are disconnected or inadvertently welded or short-circuited.
3, detect A, B, C, D each signal is short-circuited or a signal and ground short circuit.
Note: The main test ABCD line signal.
C. One or several lines are off when all lights are on. 1. Check if the line between 138 and 4953 is open or short-circuited.
D. In line scanning, two or more lines (usually a multiple of two, regularity) light up at the same time. 1. Detect whether the signals A, B, C, and D are short-circuited.
2. Check if the output of 4953 is shorted to other output terminals.
E. When there is full light, there is a single point or multi-point (irregular). 1. Find out whether the corresponding control foot of this module measures a short circuit with this one.
2, replace the module or single lamp.
F. When there is one column or several columns that are not lit at the moment of bright, 1. Find the pin that controls this column on the module and check whether it is connected with the output terminal of the driver IC (74HC595/TB62726).
G. There is single-point or single-column highlighting, or full-line highlighting, and it is not controlled. 1. Check that the column is short-circuited to the power supply ground.
2. Check if the line is shorted to the positive side of the power supply.
3, replace its driver IC.
H. The display is garbled, but the signal output to the next board is normal. 1. Check that the corresponding STB latch output of the 245 is connected to the latch of the driver IC or the signal is shorted to other lines.
I. The display is confusing, the output is abnormal , and the detection clock CLK latches the STB signal for short circuit.
2. Detect whether the 245 clock CLK has input and output.
3. Check if the clock signal is shorted to other lines.
Note: The main detection clock and latch signal.
J. The display of lack of color 1 and the detection of the data of the color 245 have input/output.
2. Detect if the data signal of this color is shorted to other lines.
3. Check whether the cascaded data port between the driver ICs of this color is open circuited or short circuited and soldered.
Note: The voltage detection method can be used to find the problem more easily, and whether the voltage of the data port is different from the normal one is determined and the fault area is determined.
K. There is a problem with the output. 1. Check whether the output interface to the signal output IC is connected or short-circuited.
2. Check if the clock latch signal of the output port is normal.
3. Check whether the cascade output data port between the last driver IC is connected to the data interface of the output interface or whether it is short-circuited.
4. Whether the output signals are short-circuited or shorted to ground.
5, check the output cable is good.
2. Check whether the test card recognizes the interface. The red flashing of the test card is not identified. Check whether the light board is in the same power source as the test card, or whether the light board interface is short-circuited to the ground and the interface cannot be identified. (Smart Test Card)
3. Check whether the 74HC245 is short-circuited by a short circuit or not, and whether the corresponding input/output pin of the 245 signal is pinned or short-circuited to other lines.
Note: Mainly check the power and enable (EN) signals.
B. During point-sweep scanning, the regular interlaced display screen is not overlapped. 1. Check if the A, B, C, and D signal input ports are disconnected to 245 or they are short-circuited.
2. Check whether the 245 corresponding A, B, C, D output terminals and 138 are disconnected or inadvertently welded or short-circuited.
3, detect A, B, C, D each signal is short-circuited or a signal and ground short circuit.
Note: The main test ABCD line signal.
C. One or several lines are off when all lights are on. 1. Check if the line between 138 and 4953 is open or short-circuited.
D. In line scanning, two or more lines (usually a multiple of two, regularity) light up at the same time. 1. Detect whether the signals A, B, C, and D are short-circuited.
2. Check if the output of 4953 is shorted to other output terminals.
E. When there is full light, there is a single point or multi-point (irregular). 1. Find out whether the corresponding control foot of this module measures a short circuit with this one.
2, replace the module or single lamp.
F. When there is one column or several columns that are not lit at the moment of bright, 1. Find the pin that controls this column on the module and check whether it is connected with the output terminal of the driver IC (74HC595/TB62726).
G. There is single-point or single-column highlighting, or full-line highlighting, and it is not controlled. 1. Check that the column is short-circuited to the power supply ground.
2. Check if the line is shorted to the positive side of the power supply.
3, replace its driver IC.
H. The display is garbled, but the signal output to the next board is normal. 1. Check that the corresponding STB latch output of the 245 is connected to the latch of the driver IC or the signal is shorted to other lines.
I. The display is confusing, the output is abnormal , and the detection clock CLK latches the STB signal for short circuit.
2. Detect whether the 245 clock CLK has input and output.
3. Check if the clock signal is shorted to other lines.
Note: The main detection clock and latch signal.
J. The display of lack of color 1 and the detection of the data of the color 245 have input/output.
2. Detect if the data signal of this color is shorted to other lines.
3. Check whether the cascaded data port between the driver ICs of this color is open circuited or short circuited and soldered.
Note: The voltage detection method can be used to find the problem more easily, and whether the voltage of the data port is different from the normal one is determined and the fault area is determined.
K. There is a problem with the output. 1. Check whether the output interface to the signal output IC is connected or short-circuited.
2. Check if the clock latch signal of the output port is normal.
3. Check whether the cascade output data port between the last driver IC is connected to the data interface of the output interface or whether it is short-circuited.
4. Whether the output signals are short-circuited or shorted to ground.
5, check the output cable is good.
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