LG 32LG5000 - Unusual Display from TV;CATV Mode; Unusual Display from DTV Mode

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Yes
No
No
Yes
Replace Main board.
Check the Power.
Cable inserts well.
Change the IC(IC100).
Yes
Yes
No
No
Check the Tuner.
Is video
output of the Tuner
normal?(CheckTU500
_Pin15)
Is the LVDS cable
connected well?
Is the input
voltage normal?(Check
TU500_Pin4)
Is the
I2C communication
Normal?(Check Pin10,
Pin11)
3. Unusual display from TV/CATV mode
BLOCK A
Yes
No
No
Yes
Replace Main board.
Check the Power.Same as Block A.
Yes
No
Check the Tuner.
Is video
output of the tuner
normal?(Check TU500_
pin24~pin34)
Is the input
voltage normal?(Check
Pin21,22)
Is the I2C
communication Normal?
(Check Pin18,
Pin19)
4. Unusual display from DTV mode