- 55 -Failure ModePartNameDescriptionPhenomenaFailure causeMechanlcal or B/LLight leakageBrightnessat bottom of LCMbrighterthan normalB/L unit badnessUniformityB / L b r i g h t n e s sasymmetricSheet in B/L unitis unevenMount holeLack screwor screw damage*Lack screwScrew damage