Read LG 19LS4D (CHASSIS:LD83A) Service Manual online
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6. HDMI doesn’t 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, you 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.
Click on the first or last page to see other 19LS4D (CHASSIS:LD83A) service manuals if exist.