LG 42PX3RVC Service Manual page 20

4. No Raster
(1) Symptom
Does't minute discharge at module.
¯
It maintains the condition where the front LED is green.
¯
(2) Check following
Is the Power Board
normal?
Yes
Is the each connector
normal?
Yes
Is the Y-Board
normal?
Yes
Is the
Z- Board normal?
Yes
Is the
X- Board normal?
Yes
Is the
Ctrl Board normal?
Yes
Is the
VSC Board normal?
Yes
Is the COF of X, Y, Z
normal?
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No
Is output the normality Low/High
voltage except Stand-by 5V?
No
After connecting well each connector,
the normality it operates?
No
Is the Fuse(FS2) normal on Y-B/D?
(In case of open is replace)
No
Is the Fuse(FS1, FS2) normal on
Z-B/D? (In case of open is replace)
Is the output voltage normal after
No
remove P1, 2, 3, 4, 5 connector of
X-B/D?
Is the output voltage normal after
No
remove P1, 2, 4, 9, 10 connector of
Ctrl-B/D?
No
Is the output voltage normal 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.
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No
Replace the
Power Board.
No
Replace the
connector.
Is the output voltage
Yes
normal 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
Yes
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace the Left X-B/D
Yes
Replace
X-Board.
Yes
After remove P1001, P1100 normal
operation: Replace the VSC Board
Yes
Replace
Y-Board.
Yes
Replace
Z-Board.