Service manual

3-11
4) VIDEO PART
Component signal
is missing
Component screen
has no signal
Normal RGB output
yes
no
no
yes
Normal RGB port
No Pr signal : Check whether the signal is flown or not
J118.13-> F111-> R472 -> C474 -> IC152.7
Check whether R431 and R432 have bad soldering
No Pb signal : Check whether the signal is flown or not
J118.15-> F113-> R476 -> C476 -> IC152.8
Check whether R445 and R446 have bad soldering
Check whether L122 terminal is +9V
Check whether R507, R508, R244, R245 and R246 have bad
soldering
No Pr signal : Check whether there exists Q114.Base and
IC152.5 signals
No Pb signal : Check whether there exists Q116.Base and
IC152.10 signals
Check the direction of IC152 component
Check IC152.4 -> 9V, IC152.11 -> ground
Check whether L122 terminal is +9V
Check whether R507, R508, R244, R245 and R246 have bad
soldering
Check Y signal : Check whether there exists Q115.Base and
IC152.12 signals
Check Pr signal : Check whether there exists Q114.Base and
IC152.5 signals
Check Pb signal : Check whether there exists Q116.Base and
IC152.10 signals
Check the direction of IC152 component
Check IC152.4 -> 9V, IC152.11 -> ground
No Y signal : Check whether the signal is flown or not
J118.17-> F112-> R475 -> C475 -> IC152.14
Check whether R443 and R444 have bad soldering
Check the direction of IC152
Check IC152.4 -> 9V, IC152.11 -> ground