Common problems and solutions
First, the control system
Fault phenomenon?
Why did it fail?
Fault analysis and treatment
1, is the whole screen not bright or is there a grid?
1? , which controls whether the host is turned on.
2? Is the communication line plugged in?
3? Whether the sending card is inserted.
4? , multimedia card and acquisition card? ,? Is the data cable connection between the sending cards correct?
5? , accept the card? JP 1？ Or? JP2？ Is the switch in the wrong position?
Open the host
Plug in a communication line
Reinsert the sending card.
Connect many media cards and acquisition cards? ,? Send data lines between cards.
Adjust? JP 1？ ，JP2？ Switch places?
2? Every time at the beginning? LED？ When the studio prompts that the control system cannot be found.
1? 、COM？ Is the signal acquisition line from the port to the data sending card not connected or the computer itself is not connected? COM？ Bad mouth. ?
Connect the data cable or replace the computer.
3? , the whole screen flashes every sixteen lines of data or stays on.
1? , check? LED？ Settings in the studio?
Open it? LED？ Open the studio for debugging? -? Hardware settings (password? 168? )-System setting, set the row order to? +0? Or? + 1?
4? , the whole screen is shaking? Or ghosts
1? Check the communication line between the computer and the big screen.
2? Check the multimedia card and sending card? DVI？ Line.
3? The sending card is broken. ?
Plug in or replace the communication line.
Release? DVI？ Line punching and steel dowel?
Replace the sending card
Second, the driving part
Fault phenomenon?
Why did it fail?
Fault analysis and treatment
1, cell board 1 is not lit.
1? 、? +5V？ Electricity or? GND？ Supply or not
2? 、? +5V？ Follow? GND？ Is there a short circuit?
3? 、? 138? The fifth leg? OE？ Is there a signal?
4? 、? 245? Is there a connection? OE？ Whether the signal is normal (open circuit or short circuit); ?
Give it? +5V？ Electricity or? GND
Disconnect the short circuit.
Release? OE？ Signal supply
Turn on the open circuit and turn off the short circuit?
2. The upper or lower part of the unit board is not bright or abnormal.
1? 、? 138? First one? 5? Legs? OE？ Whether there is a signal;
2? 、? 74HC595？ First one? 1 1? 、? 12? Whether the signal of the leg is normal; (? SCLK？ 、? RCK？ )
3? , connect? OE？ Whether the signal is normal; (Open circuit or short circuit)
4? , double-row pins and? 245? Is there a connection? SCLK？ 、RCK？ Whether the signal is normal; (Open circuit or short circuit)?
Release? OE？ Signal connection
Release? SCLK？ 、? RCK？ Is the signal on?
Open connection, break short circuit.
Turn on the open circuit and turn off the short circuit?
3. The line on the cell board or the line corresponding to the module is not bright or abnormal.
1? 、? Check whether the row signal pins of the corresponding modules are welded;
2? 、? Check the line signal and? TIP 127？ Or? 4953? Is the corresponding pin disconnected or shorted with other signals?
3? 、? Check whether the upper and lower resistances of the row signal are not welded or missed.
4? 、? 74HC 138？ The output line signal corresponds to? TIP 127？ Or? 4953? Is it disconnected or short-circuited with other signals?
Welding virtual welding and missing welding.
Turn on the open circuit and turn off the short circuit?
Make up what is not welded, and weld what is missing.
Turn on the open circuit and turn off the short circuit?
4. A cell board has two lines that light up at the same time (one line is normal and the other line lights up all the time when displaying text).
1? Check whether the two signals corresponding to the module are short-circuited.
2? Check whether the output pin of 138, pull-up and pull-down resistors, module pin and the output pin of TIP 127 are short-circuited?
Break short circuit
Disconnect the short circuit?
5. Top half or bottom half? Red or green is not bright or abnormal.
1? Check whether the pins of the input line are normal. GND, +5V short circuit
2? Check whether the input pins are arranged correctly? Is the signal between 245 normal (short circuit or open circuit)
3? Is IC245 bad?
Connect the disconnected circuit.
Break short circuit
replace