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LGE Internal Use OnlyCopyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Check the input source.
Same as Block A.
No
Check the IC700.
No
Yes
Is video input
of the RGB jack normal?
(Check JK703_Pin1,
2,3,13,14)
No
If there is normal status,
Replace main board.
If there is normal status,
Replace main board.
Is waveform
of Switching IC normal?
(Check IC700_Pin11,
12,13)
8. Unusual display from RGB mode
Check the input source.
Same as Block A.
No
Check the IC900, IC901, IC903.
No
Check the IC902 and DHCP value
No
Check the IC902.
No
Yes
Is video
input of the HDMI jack
normal? (Check JK900,
901,902)
Yes
Check DDC
communication
lines(IC900,901,903
_Pin5,6
Yes
Check HDCP
communication lines
(IC902)
No
Is waveform
of Switching IC normal?
(Check IC902)
9. Unusual display from HDMI 1/2/3 mode