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  Quality creates the future，Details determine perfection
LED display: P10-1R module working principle and fault repair
Source: | Author:mthinkled | Published time: 2019-01-23 | 1306 Views | Share:
LED display: P10-1R module working principle and fault repair one, module signal introduction 1, power supply voltage: DC5V 2, data interface mode: T12, 8 rows per zone, 8 columns per zone, on the data, OE high effective. 3, input signal: A, B, OE, DR, STB, CLK, GND 4, input signal introduction: A and B for scanning signal (1/4 scan), OE for power, DR for data, STB for latch, CLK for clock, GND for ground (power negative) II, IC introduction (Can query the detailed information on the Internet) 1, U1 is 74HC245, U2 and U3 is 4953, U4 is 74HC138, UR1-UR16 is 74HC595 2, 74HC245 function is amplification signal, all input signals must pass through this IC. Sometimes there is a problem with the whole plate or not the transmission may be this IC damaged or false welding. 3, 4953 function is the control line, if the board horizontal direction is faulty and the whole line is generally the fault of this IC. 1 piece 4953 control 8 lines. 4, 74HC138 function is to control the scan, input A, B and OE signal output 4 signals to control 2 pieces 4953. The 5, 74HC595 function is displayed in the control column, with 8 signals input STB, CLK, and DR signal output to control 8 light widths . Outdoor module fault repair (to P10-1R as an example) 1, the whole board is not lit: the board is not connected to the power supply; 2, this board does not light transmission normal: protection circuit damage solution can be 74HC138 4th foot and 5th foot short circuit. 3, three lines are not lit: 4953 damage (is one of the damage). 4, a line of light: A signal problem, please check 74HC245 and 74HC138 whether there is a false welding; 5, two lines of light two lines: B signal problem, please check 74HC245 and 74HC138 whether there is false welding; 6, the upper half of the normal lower half plate full yon or not lit: if the T08A interface has this situation, this is to check the next 8 rows of DR data signal is a path, such as normal first replace 74HC245 and then replace the first 74HC595. 7, the board half board and the lower plate STB and CLK signal son is common, the data is separate (if the T12 interface data is also 1). Such as checking the T08A board is on the upper and lower boards to be checked separately. 8, if the board has 1 lamp is not lit: check whether the false welding, replace this lamp. 9, there are 4 lights not lit: the first check 74HC595 for false welding; 10, in the vertical 4 lights of 3 not bright there is a normal: replace the normal lamp. 11, if the board is not showing abnormally from the middle or elsewhere: check the data signal path condition, replace the 74HC595 of the last normal display control light, and replace the 74HC595, if the first display of abnormal lamp control is not excluded. Each 74HC595 controls 8 points wide . . . 4 points high lamp. The 74HC595 is connected with DR data signal, which is the DR signal from the 14th foot of the 74HC595 to the 9th foot to the last 74HC595 foot to the last 74HC595. For example, this board DR data from the gold needle to 74HC345 amplification to UR1 to 3 until 8 8 after the output of UR UR to the injection UR UR. 12, sometimes in the debugging process of the whole screen in front of the module to the back of the module display is not normal, the general fault is not inserted or damaged, you can also use a slightly longer line to the following is checking the module line inserted into the above abnormal module, see how to show, you can also put the above abnormal in front of the normal module output to see the next row of modules to see how to see how to determine the mold group, to determine how to see the mold group in the end, to determine how to see the mold group. Note: Other models of service are consistent with the same principle.