LG RU-50PZ61, Service Manual

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TROUBLE SHOOTING GUIDE
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?
Replace Power
Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Are all connectors
connected?
Replace
connector.
Replace
Y-Board.
After connecting each connector well,
is operation good?
Yes
No No
Is the Ctrl Board
good?
Replace
X-Board.
Is the output voltage good after
removing P1, 2, 101, 300, 701, 702
connector of Ctrl-B/D?
Yes
No Yes
Is the Y-Board good?
Is the output voltage
good after removing
P5, P6 connector of
Y-B/D?
Check Fuse(F52) on Y-B/D?
(In case of open, replace fuse)
Yes
No Yes Yes
Replace
Z-Board.
Is the Z-Board good?
Is the output voltage
good after removing
P1 connector of Z-
B/D?
Check Fuse(FS1, FS2) on Z-B/D?
(In case of open, replace fuse)
Yes
No Yes
Is the X-Board good?
Is the output voltage good after
removing P1, 2, 3, 4, 6, 7 connector
of X-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.
Yes
No Yes
Is the VSC Board
good?
Is the output voltage good after
removing P1000, P1200?
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is
replace the module.
After removing P1000 normal
operation: Replace Analog Board
After removing P1200 normal
operation: Replace Digital Board
Yes
No
Is normal the
COF of X, Y, Z?
No
Yes
Yes
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