Hitachi 61HDX98B Manual page 97

T R O U B L E S H O O TING (NO R A S T E R N O P O W E R
DP-85 CHASSIS TROUBLESHOOTING
1.) No Raster and No Power (GREEN LED's going OFF)
(Power)
Find which LED is going Dark and OFF
(Other LED's are going OFF a little later)
(Power)
D924 is Dark
(LNB)
(Power)
D943 is Dark
(+5VS)
(Power)
D962 is Dark
(-5VS)
(Power)
D928 is Dark
(-5VS)
(Power)
D945 is Dark
(+3.3VS)
(Power)
D947 is Dark
(D+3.3VS)
(Power)
D971 (TV5V)
Check D970,
I914, Q914, etc.
PMQ1,
PMQ2, PMQ3
disconnect
PMQ1,
PMQ2, PMQ3
disconnect
PMQ1,
PMQ2, PMQ3
disconnect
PMQ1,
PMQ2, PMQ3
disconnect
PMQ1,
PMQ2, PMQ3
disconnect
PMQ1,
PMQ2, PMQ3
disconnect
(Power)
D930 (TV9V)
Check D929,
I908, Q914, etc.
DP-8 X S eries Chassis.
One LED Going OFF a little
G
before the others.
Dark
(Power)
Is D924
I912, Q904, Q903
dark?
D926, D921, etc.
Bright
Dark
(Power)
Is D943 Check +5VS line
dark?
Bright
Dark
(Power)
Is D962
dark?
Bright
Dark
(Power)
Is D928 (Power) D927, I907
dark? (Signal PWB) Q001,
Bright
Dark
(Power)
Is D945 Check +3.3VS line
dark?
Bright
Dark
(Power)
Is D947
dark?
Bright
(Power)
D920
(Audio R+21V)
Check +21V line
E995, D912,
I402, etc.
(Power)
Check LNB line
Check DM-1
(Power)
I909, D942, etc.
Check DM-1
(Power)
Check -5VS line
Q909, etc.
Check DM-1
Check Standby
+12V line
I001, etc
Check DM-1
(Power)
I911, D946, etc.
Check DM-1
Check Standby
D+3.3VS line
I911, D946, etc
Check DM-1
(Power)
D919
(Audio F+28V)
Check +28V line
E994, D911,
I401, I403, etc.
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