Dvd Troubleshooting - Zenith XBV243 series Service Manual

DVD TROUBLESHOOTING (CONTINUED)
5. Y/C CIRCUIT
(1) No Video in EE Mode
No Video in EE Mode
Does the Video signal
appear at IC301
Pins28, 30, 31?
YES
Is 5.2V applied to IC301
Pins12, 36, 61, 67, 90, 96?
YES
Does the Video signal
appear at IC301 Pin 52?
YES
Does the Video signal
appear at IC501 Pin 45?
YES
Does the Video signal
appear at the Emitter
terminal of Q801?
VR168 - 923-03485
ELECTRICAL
Check DVD Video Input (IC802, Pin29), Tuner Video Input
(TU701 Pin24), Line Video Input (JK801), respectively.
Check the REG 5V Line.
(Power Circuit)
Is I2C BUS signal applied to
IC301 Pins 62, 63?
YES
Check the path of the signal
between Ic301 Pin
52 and IC501 Pins 43, 45.
Is there 12V on the plus
terminal of C822?
YES
Replace Q801.
3-8
Check the System Circuit.
(Refer to 'SYSTEM I2C BUS
CHECK Trouble Shooting')
Check C330. (AGC)
YES
Replace IC301.
Check the REG 12V Line.
(Power Circuit)
D35E COMBO - ELECTRICAL