LG 60PZ9M/MA, Service Manual

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4. No Raster
(1) Symptom
Ø
Does’t minute discharge at module.
Ø
It maintains the condition where the front LED is green.
(2) Check following
Is the Power Board
normal?
Replace the
Power Board.
Is output the normality Low/High
voltage except Stand-by 5V?
Yes
No No
Is the each connector
normal?
Replace the
connector.
Replace
Y-Board.
After connecting well each connector,
the normality it operates?
Yes
No No
Is the
Ctrl Board normal?
Replace
X-Board.
Is the output voltage normal after
remove P1, 2, 4, 9, 10 connector of
Ctrl-B/D?
Yes
No Yes
Is the Y-Board
normal?
Is the output voltage
normal after remove
P5, P6 connector of
Y-B/D?
Is the Fuse(FS2) normal on Y-B/D?
(In case of open is replace)
Yes
No Yes Yes
Replace
Z-Board.
Is the
Z- Board normal?
Is normal the output
voltage after remove
P1 connector of
Z-B/D?
Is the Fuse(FS1, FS2) normal on
Z-B/D? (In case of open is replace)
Yes
No Yes
Is the
X- Board normal?
Is the output voltage normal after
remove P1, 2, 3, 4, 5 connector of
X-B/D?
After remove P1, P2, P3 output voltage
normality: Replace Right X-B/D
After remove P4, P5 output voltage
normality: Replace the Left X-B/D
Yes
No Yes
Is the
VSC Board normal?
Is the output voltage normal after
remove P1001, P1100?
After crisis COF of each board, check the normality operates.
If in case normality operates, correspondence COF Fail is
replace the module.
After remove P1001, P1100 normal
operation: Replace the VSC Board
Yes
No
Is the COF of X, Y, Z
normal?
No
Yes
Yes