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Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
HDMI doesnt display
Check input connect J900 , J901,
J902
Can you see the normal
waveform?
Check DDC communication
lines(IC900, IC901, IC903 Pin5,6)
Check the input of HDMI
Seitch(IC902)
This signal is TMDS.
Can you see the normal waveform?
YES
YES
NO
J900 , J901, J902
may have problem. Replace this Jack.
Check the output of HDMI
Switch(IC902).
Can you see the normal waveform?
YES
YES
NO
After checking the trace of TMDS lines and
power of HDMI Switch, you should decide
to
replace HDMI Switch or not.
NO
NO
After checking the Power of this chip,
you should decide to replace this or not.
After checking the Power of HDMI
Switch you should decide to replace
MST3361 or not.
YES
Check HDCP communication
lines(IC902)
NO
After checking the Power of this chip,
y
ou should decide to replace this or not.
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
YES
NO
After checking the Power of Main
IC(IC100) you should decide to replace
Main IC or not.
This board has big problem because
Main IC(IC100) have some troubles.
After checking thoroughly all path once
again, You should decide to replace
Main Board or not.