LG RU-50PZ61 Service Manual page 18

4. No Raster
(1) Symptom
Does't minute discharge at module.
¯
Front LED is green but, no Raster.
¯
(2) Check follow
Is the Power Board
good?
Yes
Are all connectors
connected?
Yes
Is the Y-Board good?
Yes
Is the Z-Board good?
Yes
Is the X-Board good?
Yes
Is the Ctrl Board
good?
Yes
Is the VSC Board
good?
Yes
Is normal the
COF of X, Y, Z?
TROUBLE SHOOTING GUIDE
No
Is output the normality Low/High
voltage except Stand-by 5V?
No
After connecting each connector well,
is operation good?
No
Check Fuse(F52) on Y-B/D?
(In case of open, replace fuse)
No
Check Fuse(FS1, FS2) on Z-B/D?
(In case of open, replace fuse)
Is the output voltage good after
No
removing P1, 2, 3, 4, 6, 7 connector
of X-B/D?
Is the output voltage good after
No
removing P1, 2, 101, 300, 701, 702
connector of Ctrl-B/D?
No
Is the output voltage good after
removing P1000, P1200?
No
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is
replace the module.
No
No
Yes
Yes
Yes
Yes
Yes
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Replace Power
Board.
Replace
connector.
Is the output voltage
Yes
good after removing
P5, P6 connector of
Y-B/D?
Is the output voltage
Yes
good after removing
P1 connector of Z-
B/D?
After removing P1, P2, P3, P4 output
voltage normal: Replace Right X-B/D.
After removing P6, P7 output voltage
normal: Replace Left X-B/D.
Replace
X-Board.
After removing P1000 normal
operation: Replace Analog Board
After removing P1200 normal
operation: Replace Digital Board
Replace
Y-Board.
Replace
Z-Board.