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1. When scanning obliquely, the regular interlacing does not show the overlap of the screen. 1. Check if there is any broken or short welding between the ABCD signal input port and 245, and short circuit.
2. Measure whether there is an open circuit or a virtual solder between the ABCD output end and 138 corresponding to 245, and short circuit.
3. Detect whether there is a short circuit between the ABCD signals or a signal is wrong or not, mainly detecting the ABCD line signal.
4 During the scan, there is no normal scan check (CLK) or latch (STB) signal and the test card is connected or not.
When it is fully lit, there is a line or the peer is not bright. The line between 138 and 4953 is detected whether the line is open or short-circuited or short-circuited.
In the line scan, two or more lines (generally a multiple of 2, regular) simultaneously illuminate the short circuit.
1. Detect whether there is a short circuit between ABCD signals.
2. Detect whether there is a short circuit between ABCD signals.
When all lights up, there are one or several columns of non-bright soldering on the module to find the pin that controls the column, and test whether it is connected to the output of the driver IC (YZ5026/TB62726, etc.).
There is a single point or single column brightness is too high, or the entire line is too bright and not controlled.
1. Check if the column is shorted to the power ground.
2. Check if the line is shorted to the positive terminal of the power supply.
3. Replace its driver IC
Output has a problem short circuit
1. Check whether the line from the output interface to the signal output IC is connected or shorted.
2. Check if the clock latch signal of the output port is normal.
3. Check if the cascaded output data port between the last driver IC is connected to the data port of the output interface or is shorted.
4. Whether the output signals are short-circuited to each other or short-circuited to the ground.
5. Check if the output cable is good.
[ Huaqiang Security Network News ] Today Xiaobian will share a topic for you, that is , the "maintenance" of LED display , it sounds very simple, but it is very difficult to do it. This article will introduce the summary of LED maintenance and debugging methods. ,I hope to be helpful. Irregular scanning