LG 42PX2RVA Service Manual page 19

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?
Yes
Is normal the each
connector?
Yes
Is normal the
Y- Board?
Yes
Is normal the
Z- Board?
Yes
Is normal the
X- Board?
Yes
Is normal the
Ctrl Board?
Yes
Is normal the
VSC Board?
Yes
Is normal the
COF of X, Y, Z?
No
Is output the normality Low/High
voltage except Stand-by 5V?
No
After connecting well each connector,
the normality it operates?
No
Is normal the Fuse(FS2) on Y-B/D?
(In case of open is replace)
No
Is normal the Fuse(FS1, FS2) on Z-
B/D? (In case of open is replace)
Is normal the output voltage after
No
remove P1, 2, 3, 4, 5 connector of
X-B/D?
Is normal the output voltage after
No
remove P1, 2, 4, 9, 10 connector of
Ctrl-B/D?
No
Is normal the output voltage after
remove P1001, P1100?
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 normal the output
Yes
voltage after remove
P5, P6 connector of
Y-B/D?
Is normal the output
Yes
voltage after remove
P1 connector of
Z-B/D?
After remove P1, P2, P3 output voltage
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace Left X-B/D
Replace
X-Board.
After remove P1001, P1100 normal
operation: Replace VSC Board
Replace
Y-Board.
Replace
Z-Board.