Nebula NBL-P5403, User Manual

No display

SITUATION

CAUSE

ACTION

5.1  

   TROUBLE SHOOTING

1) No power input

2) Power connection error

3) Display damaged

4) Display board IC error

，

or  power input 

    connection error

，

or two board connection 

    error

5) Contrast decay

1) Check power supply
2) Check power connection 
3) Replace  display
4) Check the IC and all the connections
5) Adjust the LCD contrast

1) Display IC reverse install
2) Display IC  damaged

1) Check Display IC installation and quality

LED MODULE 
on, but no control 
from display

Display normal, 
but no response 
from buttons

1) Buttons damaged
2) Display IC damaged

1 ) R e p l a c e  b u t t o n s
2) Replace Display IC

1) Signal Cable error
2) Signal conncetion error
3) The DMX signal receive IC damaged
4)  DMX address error

No DMX signal 

1) Check all signal Cables
2) Check all signal  conncetions
3) Check the DMX signal receive IC
4) Check DMX address

1) The heat sensor resistance of LED board 
      error
2) The temperature protection circuit on the 
      display error.

When the surface  
temperature of the 
unit exceed 75

℃

, the 

temperature protection  
no work .

1) Replace the heat sensor resistance.
2) Check the temperature protection circuit.

1) Check LEDs joining
2) Check lens installing

1) LED not joining well
2) Lens not installing well

Color mixing 
uneven,with splash

1) LED damaged
2) LED damaged or Main PCB 

LEDs of the same
 color are not lit

1) Replace LEDs
2) Replace damaged LED or Main PCB

1) Replace saving IC

1) Saving IC damaged

Manual and program 
can not save

20

5

APPENDIX

1) Check driver current of the partial color 
     LEDs on the Driver PCB
2) Check LED quality 
3) Reset to factory default setting.

1) The current of one of the color group LEDs 
is too strong or too weak. 
2) LED brightness not enough

Partial color

（

partial red,partial 

green, partial blue
 or partial white

）