Disconnect line output tube, received fake load as has squeaking of calls, description power part exists fault, measuring line powered has by normal of 112V rose to 124V, check easy loss of Electrolytic Capacitor, with substitution method check have capacitor C309 (47UF/25V) metamorphic, for insurance side, using 100UF/50 of imports capacitor, and will capacitor C301 (10UF/50V) together replaced, squeaking sound fault excluded; next check no color fault, N601 measured (NPD6326C) color control of output voltage of 15 feet between the 2-11V can be changed, while color decoding N701 (TA8759BN) chromaticity control input terminal 7 pin voltage can change between 1-3.2V (normal should be 1-5V), measuring remaining pin voltage TA8759 normal, indicating it may have been damaged, the replacement of color appear, all fail.