LG 42LC4R Manual De Servicio página 21

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
Does
minute discharge
at Module?
Yes
Is the Link cable
normal?
Yes
Is the IC500's
output normal?
4. In case of becomes unusual display from RF mode.
Is video
output of the
Tuner normal? (Check
TU400_Pin13)
Yes
A
Is the LVDS
Cable connected
well?
Yes
Change the IC(IC500)
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Only for training and service purposes
No
Is the inverter
/VaVs on?
Yes
Check the PDP/LCD Module
No
Reconnect the link cable in
P803(Plasma)/ P804(LCD).
CN700(PDP/LCD)
No
Replace the VSC.
Is the
No
input voltage
normal?(Check
Pin3)
No
Check the power.
No
Cable inserts well.
Is output the normality
No
Low/High voltage
except Stand-by 5V?
Yes
Is the I2C communication normal?
(Check Pin9, Pin10)
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Replace the
Power board.
No
Check the Tuner.
LGE Internal Use Only