LG 42LC51, Service Manual

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3. No Raster
(1) Symptom
1) No OSD and image occur at screen.
2) It maintains the condition where the front LED is green.
(2) Check following
4. In case of becomes unusual display from RF mode.
Check the PDP/LCD Module
Replace the
Power board.
Does
minute discharge
at Module?
Is the inverter
/VaVs on?
Is output the normality
Low/High voltage
except Stand-by 5V?
Yes
No No
Is the Link cable
normal?
Yes
Is the IC500’s
output normal?
Reconnect the link cable in
P803(Plasma)/ P804(LCD).
No
Replace the VSC.
No
Yes
Check the power.
Is video
output of the
Tuner normal? (Check
TU400_Pin13)
Is the
input voltage
normal?(Check
Pin3)
Is the I2C communication normal?
(Check Pin9, Pin10)
Yes
No Yes
Is the LVDS
Cable connected
well?
Yes
Change the IC(IC500)
Cable inserts well.
No
No
Check the Tuner.
No
A