LG 26LC2R Service Manual - Page 27

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7. No picture (1) Symptom 1) Some mode doesn't display. 2) Front LED is green 3) The set still discharge a little (2) Check process 1) RF-mode doesn't display Is the LVDS cable Yes Is the Tuner cable Yes connected? connected? No No Are good some Yes elements (C, R, L, or Diode) at path? No Are input voltage, I2C, and CVBS Yes output good in Tuner? No Is VCT-P IC good? No Insert the LVDS cable exactly Insert the Tuner cable exactly If it dead or short, exchange this elements Exchange the Tuner Exchange the VCT-P IC 2) AV/Component-mode doesn't display Is the LVDS cable Yes connected? Are good some elements (C, R, L, Yes or Diode) at path? Is VCT-P IC good? No No No Insert the LVDS cable exactly If it dead or short, exchange this elements 3) RGB/HDMI-mode doesn' Exchange the VCT-P IC Is the LVDS cable Yes connected? Are good some Yes elements (C, R, L, or Diode) at path? Check the EDID data No No No Yes Is AD9381 good? Yes (only _ HDMI) No Is VCT-P IC good? No Insert the LVDS cable exactly If it dead or short, exchange this elements Download the EDID data Exchange AD9381 IC Exchange the VCT-P IC - 27 -

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7. No picture
(1) Symptom
1) Some mode doesn’t display.
2) Front LED is green
3) The set still discharge a little
(2) Check process
1) RF-mode doesn’t display
2) AV/Component-mode doesn’t display
3) RGB/HDMI-mode doesn’
- 27 -
Yes
Yes
Yes
Yes
No
No
No
No
No
Is the LVDS cable
connected?
Is the Tuner cable
connected?
Are good some
elements (C, R, L,
or Diode) at path?
Are input voltage,
I
2
C, and CVBS
output good in
Tuner?
Is VCT-P IC good?
Insert the LVDS
cable exactly
Insert the Tuner
cable exactly
If it dead or short,
exchange this
elements
Yes
Yes
No
No
No
Is the LVDS cable
connected?
Are good some
elements (C, R, L,
or Diode) at path?
Insert the LVDS
cable exactly
Is VCT-P IC good?
Exchange the
VCT-P IC
If it dead or short,
exchange this
elements
Exchange the
Tuner
Exchange the
VCT-P IC
Yes
Yes
Yes
Yes
No
No
No
No
Is the LVDS cable
connected?
Check the EDID
data
Is AD9381 good?
(only _ HDMI)
Are good some
elements (C, R, L,
or Diode) at path?
Is VCT-P IC good?
Insert the LVDS
cable exactly
No
Download the
EDID data
If it dead or short,
exchange this
elements
Exchange AD9381
IC
Exchange the
VCT-P IC