I have solved this problem, by replace PPLED DIODE , it is zener diode regulator 3.3v for odd led B, and even led A. on ipad air diode D8228 chanel A, and diode D8258 chanel B. locate it at beside U8100. must be have schematic diagram will it. if one diode dead, lcd shows look like picture above. if both lcd show black but still have icons is very dime. good lucky. hahah.