Philips DVP721VR - Y;C Circuit

3-11
4. Y/C CIRCUIT
(1) No Video in EE Mode,
No Video in EE Mode
Check the 19Pin of Tuner.
Does the Video signal
appear at the IC301 Pin48?
Is 5V applied to the IC301
Pins18, 24, 42, 55, 72, 91?
Does the Video signal
appear at the IC301 Pin65?
Does the Video signal
appear at the IC501 Pin19?
Does the Video signal appear
at the Emitter terminal of the
Q309, IC802 Pin 30?
Check the 5.0VT, 5.3VA
Line. (Power Circuit)
Is I
2
C BUS signal applied to
the IC301 Pins68, 69?
Check C316. (AGC)
Chck the path of the signal
between the IC301 Pin65
and IC501 Pin17.
Replace the IC301.
Does the 12VT, 5.3VA appear
at the Emitter terminal of the
Q309 IC802 Pin 2, 4.
Replace the Q309, IC802.
Check the 12VT, 5.4VA
Line. (Power Circuit)
Check the System Circuit.
(Refer to ‘SYSTEM I
2
C BUS
CHECK Trouble Shooting’)
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
NO