Display not bright
When connect to the electricity
，
did the led flash one time? If so
，
the
power source is normal; If not
，
please check if the switch and the
transformer has power out
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.
Chang the display
LED not light
When connect to the electricity
，
did the led flash one time? If so
，
the
power source is normal; If not
，
please check if the switch and the
transformer has power out
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.
Chang the display
Some of the LED not
light
LED is connected by leds in series first, then connect parallel, so
please check if the leds is loose
Use the multimeter to check if the led is bright or not, of 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)
Single color leds
always bright/not
bright
Check the switch of this color is normal or not
Change the IC control board
Noted
：
only professional persons can do as above
！
