LG RF-043B, Service Manual

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4. No Raster
(1) Symptom
¯
Does’t minute discharge at module.
¯
It maintains the condition where the front LED is green.
(2) Check follow
Is normal the Power
Board?
Replace Power
Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Is normal the each
connector?
Replace
connector.
Replace
Y-Board.
After connecting well each connector,
the normality it operates?
Yes
No No
Is normal the
Ctrl Board?
Replace
X-Board.
Is normal the output voltage after
remove P1, 2, 101, 300, 701, 702
connector of Ctrl-B/D?
Yes
No Yes
Is normal the
Y- Board?
Is normal the output
voltage after remove
P5, P6 connector of
Y-B/D?
Is normal the Fuse(F52) on Y-B/D?
(In case of open is replace)
Yes
No Yes Yes
Replace
Z-Board.
Is normal the
Z- Board?
Is normal the output
voltage after remove
P1 connector of
Z-B/D?
Is normal the Fuse(FS1, FS2) on Z-
B/D? (In case of open is replace)
Yes
No Yes
Is normal the
X- Board?
Is normal the output voltage after
remove P1, 2, 3, 4, 6, 7 connector of
X-B/D?
After remove P1, P2, P3, P4 output voltage
normality: Replace Right X-B/D
After remove P6, P7 output voltage
normality: Replace Left X-B/D
Yes
No Yes
Is normal the
VSC Board?
Is normal the output voltage after
remove 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 remove P1000 normal operation:
Replace Analog Board
After remove P1200 normal operation:
Replace Digital Board
Yes
No
Is normal the
COF of X, Y, Z?
No
Yes
Yes
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