LG 42PC3RA Series, Service Manual

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8. No Picture
(1) Symptom
1) Some mode doesn’t display.
2) Front LED is green.
3) The set still discharge a little.
(2) Check following
Is the LVDS cable
connected?
Is the Tuner cable
Connected?
Are good some elements
(C, R, L, or Diode) at path?
Yes Yes
Insert the LVDS
cable exactly
Insert the Tuner
cable exactly
If it dead or short,
exchange this elements
Yes
1) RF-mode doesn’t display
2) AV/Component-mode doesn’t display.
3) RGB/HDMI-mode doesn’t display.
No No
Are input voltage, I2C, and
CVBS output good in Tuner?
Exchange the Tuner
No
Is VCT-P IC good?
Exchange the VCT-P IC
No
No
Is the LVDS cable
connected?
Are good some elements
(C, R, L, or Diode) at path?
Check the EDID data
Yes Yes
Insert the LVDS
cable exactly
If it dead or short,
exchange this elements
Download the EDID data
Yes
No No
Is AD9381 good?
(only _ HDMI)
Exchange AD9381 IC
No
Is VCT-P IC good?
Exchange the VCT-P IC
No
No
Is the LVDS cable
connected?
Are good some elements
(C, R, L, or Diode) at path?
Is VCT-P IC good?
Yes Yes
Insert the LVDS
cable exactly
If it dead or short,
exchange this elements
Exchange the VCT-P IC
No No