Hdmi / Dvi Doesn T Display - LG M227WD Service Manual

HDMI / DVI doesn t display

Check input connect
JK900, JK901, JK902
Can you see the normal
waveform?
Check DDC communication
lines(IC901, IC902, IC903 Pin5,6 )
Check HDCP communication
lines(IC900)
Check the input of HDMI
Seitch(IC900)
This signal is TMDS.
Can you see the normal waveform?
Check the output of HDMI
Switch(IC900).
Can you see the normal waveform?
Check the output of Main IC(IC100).
Especially you should check
The H,V sync and clock.
Can you see the normal waveform?
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.
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C
Only for training and service purposes
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
JK900, JK901, JK902
may have problem. Replace this Jack.
After checking the Power of this chip,
you should decide to replace this or not.
After checking the Power of this chip,
y ou should decide to replace this or not.
After checking the trace of TMDS lines and
power of HDMI Switch, you should decide to
replace HDMI Switch or not.
After checking the Power of HDMI
Switch you should decide to replace
TMDS351 or not .
After checking the Power of Main
IC(IC100) you should decide to replace
Main IC or not.
- 24 - LGE Internal Use Only