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| Home >> Service & Technical support >> FAQ |
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| Common Faults and LED display exclusion method |
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| 1.The whole screen doesn't light or appears pane |
check if the controlling host machine has started
check if the communication line is well plugged
check if the sending card is well plugged
check if the data line between the multi-media card and collecting card and sending card is well connected
adjust well the switch location of JP1 and JP2 |
| 2.Every time when starting LED studio, there is a hint :controlling system cannot be found |
| The signal collecting line between COM port to sending card doesn't connect or the COM port of the computer is broken , please connect data line well or change computer. |
| 3 .in the whole screen, the data glitter or keep lighting every 16 lines |
| Please Check the settings in LED studio. open the debugging hardware setting password 168 system setting set the row sequence as +0 or +1 |
| 4 .whole screen pictures tingling or fringing |
Check the communication line between the computer and large screen.
Check the DVI line between multi-media card and sending card
Check if the sending card is broken |
| 5.One unit panel do not light |
1 if +5V electricity or GND supply
2 if +5V and GND are short circuit
3 if the OE signals of 138 no. 5 leg exists
4 if the OE signals which connected with 245 are normal (open circuit or short circuit) |
| 6.One unit panel upper half or lower half do not light or display abnormally |
1 if the 5 th leg of OE signal of 138 exists .
2 if the no. 11 and 12 leg signals of 74HC595 are normal(SCLK,RCK).
3 if the connected OE signals are normal; open circuit or short circuit .
4 double row pins and the signal of SCLK ,RCK connected with 245 are normal .open circuit or short circuit |
| 7. One row of one unit panel or row of one corresponding module do not light or display abnormally |
1 check if the pin of corresponding module row signal is cold welded or miss welding
2 check if the row signal and TIP127 or 4953 corresponding pins are cut off or short circuit with other signals
3 check if the up-and-down pull resistance of row signal do not weld or miss welding
4 if the 74HC138 output row signal and corresponding TIP127 or 4953 are cut off or short circuit with other signals |
| 8.One unit panel has two rows lighting at the same time .when displaying words, one row is normal, another row keeps lighting |
1.Check if the module corresponding two rows of signals are short circuit
2.Check if the output leg of 138. up-and-down pull resistance and module pins and the output leg of TIP127 are shot circuit |
| 9.upper part or lower part, red or green don't light or not display normally |
1 check if the input row needle feet are normal or short circuit with GND.+5V
2 check if the signals from input row needle to 245 are normal short circuit or open circuit.
3 IC245 is broken |
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