need tell me the TV model 

becuase no same TV Voltage no same

this is LED need chagne 4 Pieces /lot and good  

 If your machine is only 1PCS bad or two PCS bad , we still propose replaced 4 Pieces /lot .
If only change for one or two PCS,the uneven brightness should be the difference between old and new light bead brightness 
 If 1PCS bad , are soon broken other light bead becuase the life of each lamp beads are almost the same