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parallel, so please check if the leds is loose
Some of the LED
Use the multi meter to check if the led is bright or
not light
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
Check the switch of this color is normal or not
always bright/not
Change the IC control board
bright
！
Noted only professional persons can do as above
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