quEstions 169-171 rEFEr to thE Following mAnuAl. trouBlEshooting iF your tv DoEs not work，ChECk thE Following points： piCturE souhD possiBlE、CAusEs whAt toDo no piCturE noisE not propErly tunED ADjust tuning piCturE visiBlE no sounD ·volumE Control DiAlturnED too low ·EArphonEs insErtED ·turn up volumE ·DisConnECtEArphonEs piCturE All whitE sounD hEArD BrightnEss Control not sEt CorrECtly ADjust BrightnEss Control piCturE DArk or BlurrED sounD hEArD BrightnEss Control not sEt CorrECtly ADjust BrightnEss Control

whEn shoulD thE tuning BE ADjustEDA、whEn thErE is no piCturE AnD no sounD
B、
B、whEn thErE is A piCturE But no sounD
C、whEn thE piCturE is whitE
D、whEn thErE is noisE But no piCturE