Read LG 32LH7000 / 32LH7020 / 32LH7030 (CHASSIS:LD91D) Service Manual online
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6. HDMI doesn’t display
Check input c onnect JK600, JK601, JK602,
JK60 3
Can you see t he normal wavefo rm?
Check DD C commu nication lin es(IC600,
IC601)
Check th e in pu t o f HDMI Switch (IC600)
This sign al is TMDS.
Can you see t he normal wavefo rm?
YES
YES
NO
JK60 0, JK60 1, JK602, JK 603
may have problem. Rep lace th is Jack.
Check th e output of HDMI Switc h(IC600).
Can you see t he normal wavefo rm?
YES
YES
NO
After ch eckin g th e trace o f TMDS lin es and po wer of
HDMI Switch, you should decide to replace HDMI
Switch or not .
NO
NO
After ch eckin g th e Power of th is ch ip , you
should decide to replace this or not.
After ch eckin g th e Power of HDMI Switch y ou
should decide to replace HDMI S witch or not.
YES
Check HD CP co mmu nicatio n lin es(IC601)
NO
After ch eckin g th e Power of th is ch ip , you
should decide to replace this or not.
Check th e output of Main IC(IC100).
Esp ecially you sh ould ch eck
The H,V sync and c loc k.
Can you see t he normal wavefo rm?
YES
NO
After ch eckin g th e Power of Main IC(IC100) you
should decide to replace Main IC or not .
This bo ard has b ig problem becau se Main
IC(IC100) have some troubles.
Afte r c hecking thoroughly all path once again,
You sh ou ld decid e to rep lace Main Bo ard or no t.
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