No Signal Of Component Screen In Disc Play - Zenith DVR313 Series Service Manual

8. No Signal of Component Screen in DISC Play.

Q714 Collector :LOW?
YES
No Pb, Pr signal?
YES
No signal after checking
R777,773,727,728,CABLE?
YES
IC4004 -8 :HIGH ?
/RST 7104
YES
IC4004 -14,15
I2C CLK, DATA check
YES
Check IC4004 -19,20,36
Clock signal input.
YES
Check IC4002 =>IC4004
PD0 ~PD7 signal.
YES
Check IC1099=>IC4002
VO_D0 ~VO_D15 signal.
NO IC704 -52 :HIGH ?
(VIDEO MUTE )
YES
Check IC712 power and
ambient circuits.
NO
No Y signal?
YES
NO
PN4701 -13 :No Y signal?
Check IC2084 -3,46 =>
NO
IC2081 - 4,5 signal flow.
NO Check IC2033 -8, 9
IC2001 - 4,5,6,8,9,10 Signal.
NO
IC1099 =>IC4002 -37
VO_CLK signal?
YES
VO_CLK and IC4002 -22
Phase conversion?
YES
Check CIC4002 power and
ambient circuits.
NO
NO
Check
NO
Check
3-7
Check V.MUTE TR
(Q714,Q715 ) ambient circuits.
Check V. Buffer TR:Q752
power and ambient circuits.
Check IC4009 -94 :VI_CLK0.
YES
Check X401 Clock generation