ROHS Hyper Bar 252 User Manual page 10

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LED's not coming on.
Some of the LED's
not coming on.
Single color LED's
Always bright/not
bright
 When connect to the electricity，did the led flash one time? If
so，the power source is normal. If not, please check voltage
switch or voltage supply.
 Check if the power input of the IC board is normal
 Check if the cable connect to the display loose
 Change the main board to see if it is normal.
 Change the display
 LED is connect in series first, then in parallel. Check to see if
any LED's are loose.
 Use the multimeter to check if the led is powered or not. If not,
please change the led.
 Check whether current limiting resistor is normal or not
 Check constant current IC is normal or not (compared with the
normal IC)
 Check the switch of this color is normal or not
 Change the IC control board
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Hyper Bar 252 v1.0