Panasonic PT-EZ770Z Service Manual page 50

SECTION 1 SERVICE INFORMATION
■ Built-in speaker check
A Check the waveform at pins 1 and 3 of connector [A1]
A Replace speaker
A Replace [A]-P.C.Board
■ AUDIO OUT check
[ANALOG]
A Check the connection cable between connectors [A28] and
[JK4007]
J Replace [J]-P.C.Board
A Replace [A]-P.C.Board
OK
OK
OK
OK
NG
A Check IC1028 and peripheral circuits
NG
A Replace cable
INF-42