Zenith XBV613 Service Manual - Page 21

Y/c Circuit

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5. Y/C CIRCUIT (1) No Video in EE Mode, No Video in EE Mode Does the Video signal appear at IC301 Pins28, NO 30, 32? YES Does the Video signal NO appear at IC302 Pins1, 3? YES Is there SW5V at IC302 Pin6? YES Check DVD Video Input (IC601, Pin150), Tuner Video Input (TU701 Pin16), Line Video Input (JK901), respectively. Replace IC302. Is REG 5.0V applied to IC301Pins23, 44, 45, 52, 68, 77? YES Does the Video signal appear at IC301 Pin26? YES Does the Video signal appear at IC501 Pin52? YES Does the Video signal appear at the Q924 Emitter? NO Check the SW 5V Line. (Power Circuit) NO Is I2C BUS signal applied to NO IC301 Pins53, 54, 55? YES NO Check the path of the sig- nal between the IC301 Pin 26 and IC501 Pins50, 52. Check the System Circuit. (Refer to 'SYSTEM I2C BUS CHECK Trouble Shooting') Replace IC301. NO Is there 12V on the NO Check the SW 12V Line. terminal of R905? (Power Circuit) YES Replace Q924. 3-10

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3-10
5. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Does the Video signal
appear at IC302 Pins1,
3?
Is there SW5V at
IC302 Pin6?
Replace IC302.
Does the Video signal
appear at IC301 Pins28,
30, 32?
Is REG 5.0V applied to
IC301Pins23, 44, 45, 52,
68, 77?
Does the Video signal
appear at IC301 Pin26?
Does the Video signal
appear at IC501 Pin52?
Does the Video signal
appear at the Q924
Emitter?
Check the SW 5V Line.
(Power Circuit)
Is I
2
C BUS signal applied to
IC301 Pins53, 54, 55?
Replace IC301.
Check the path of the sig-
nal between the IC301 Pin
26 and IC501 Pins50, 52.
Is there 12V on the
terminal of R905?
Check the SW 12V Line.
(Power Circuit)
Replace Q924.
Check the System Circuit.
(Refer to
‘
SYSTEM I
2
C BUS
CHECK Trouble Shooting
’
)
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO
YES
YES
Check DVD Video Input
(IC601, Pin150), Tuner
Video Input (TU701 Pin16),
Line Video Input (JK901),
respectively.
NO