Service ManualModelModelModelModel No.:No.:No.:No.: 75UF555075UF555075UF555075UF5550o color for some channel program (black and white)o color for some channel program (black and white)erify if the sameproblem exists in otherchannelsYescheck out of pictureand sound systemNoNoCheck out of picture and soundsystem of this channelChange the channel to the right soundsystem (PAL-BG SECAM/L)YesRefer to relativeinstructions in theanual for color adjustUpdata the software andStill havingproblems3333make the reboot; orchange the maiboard