Service manual

3-12
RGB signal is missing
yes
no
yes
no
Component port
Normal output?
Check the direction of IC151
Check IC151.4 -> 9V, IC151.11 -> ground
Check whether there exists Pin 7, 8 and 12 signals of IC151 from
VGA connector
Red : J111.1 -> F106 -> R471 -> C471
Green : J111.2 -> F107 -> R473 -> C472
Blue : Check J111.3 -> F108 -> R474 -> C473 signal
Check whether R429, R430, R439, R440, R441 and R442 have
bad soldering
Check L122 terminal is +9V.
Check whether R507,R508, R244, R245 and R246 have bad
soldering
Check Green signal : Check whether there exists Q115.Base and
IC151.12 signals.
Check Red signal : Check whether there exists Q114.Base and
IC151.5 signals
Check Blue signal : Check whether there exists Q116.Base and
IC151.10 signals
Check IC151 and IC152 direction
Check IC151.4 -> 9V, IC151.11 -> ground
Check the direction of IC162
Check IC162.20 -> 3.3V
Check IC162.10 -> ground
Check Hsync: Check J111.13 -> F109 -> R449 -> IC162.18 ->
IC162.2 signals
Check Vsync: Check J111.14 -> F110 -> R450 -> IC162.16 ->
IC162.4 signals
Check the direction of IC151
Check IC151.4 -> 9V, IC151.11 -> ground
Check whether L122 terminal is +9V.
Check Hsync and Vsync (See the above block)
Check whether R507,R508, R244, R245 and R246 have bad
soldering
Check Green signal : Check whether there exists Q115.Base and
IC151.12 signals.
Check Red signal : Check whether there exists Q114.Base and
IC151.5 signals
Check Blue signal : Check whether there exists Q116.Base and
IC151.10 signals
Check IC151 and IC152 direction
Check IC151.4 -> 9V, IC151.11 -> ground
No RGB screen
signal
Normal YPbPr port output