Y/C Circuit - Toshiba SD-V55HTSU Circuit Diagrams

5. Y/C CIRCUIT

(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal
appear at the IC301
Pins28, 30, 32?
YES
Is REG 5.0V applied to the
IC301Pins23, 44, 45, 52, 68,
77?
YES
Does the Video signal
appear at the IC301 Pin26?
YES
Does the Video signal
appear at the IC501 Pin52?
YES
Does the Video signal
appear at the IC602 Pin7?
Does the Video signal
NO
appear at the IC302
Pins1, 5?
YES
Is there 5V at the IC302
Pin6?
YES
Replace the IC302.
NO
Check the REG 5V Line.
(Power Circuit)
NO
Is I 2 C BUS signal applied to
the IC301 Pins53, 54, 55?
YES
Check the path of the sig-
NO
nal between the IC301 Pin
26 and IC501 Pins50, 52.
NO
Is there 5V on the plus
terminal of the C614?
YES
Replace the IC602.
3-10
Check DVD Video Input
NO
(IC602, Pin4), Tuner Video
Input (TU701 Pin16), Line
Video Input (JK601),
respectively.
Check the System Circuit.
NO
(Refer to 'SYSTEM I
CHECK Trouble Shooting')
Replace the IC301.
NO
Check the REG 5V Line.
(Power Circuit)
C BUS
2