Zenith XBV443 - Y;C Circuit

3-11
5. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the Tuner Pin16V
Check the SW 5V, 5.3VA
Line.(Power Circuit)
Is I
2
C BUS signal applied
to the IC301 Pins73, 74?
Does the Video signal
appear at the IC301
Pin15?
Is 5.0V applied to the
IC301Pins4, 22, 47, 60, 84?
Does the Video signal
appear at the IC301
Pin29?
Does the Video signal
appear at the IC501
Pin52?
Does the Video signal
appear at the IC602
Pin7?
Check the path of the sig-
nal between the IC301 Pin
29 and IC501 Pins50.
Is there Vcc 5V on the
IC602 Pin6
Does the Video signal appear at
the IC602 Pin1(DVD MODE)
Replace the IC602.
Check the 5V.
(Power Circuit)
Check the C327.(AGC)
Check the System Circuit.
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO