Yuvaraj sir ji led tester se led stripe check krte he to Kam dikhta he ( example 7×3V = 21V but led tester me vo 18v dekhte he 18× 3= 54V but led bulb 21×3 = 63v to sir ji backlight diver me kitne voltage set kre..pls samjaye sir ji.ager led khole Bina only led tester se jo voltage dikh te uske according 5v jayada set kr skte he