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Only for training and service purposes
LGE Internal Use Only
Check JP7 001,J7015.
Can you see t he normal wavefo rm?
Check th e L700, L704.
Can you see t he normal wavefo rm?
Check th e C638, C628 in fro nt of BCM3553.
Can you see t he normal wavefo rm?
YES
YES
NO
JK70 0, JK70 2 may have problem. Rep lace th is
Jack.
NO
Replace the Part (L700, L704)
NO
After ch eck th e pattern between L703 and C651,
You can suspect that PCB is bad.
YES
This bo ard has b ig problem becau se Main
chip(BCM3 553) have some trouble s.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace BCM3 553 or not.
3. Component doesn’t display
Check JP7032, JP7033, JP7034.
Can you see t he normal wavefo rm?
Check the C635, C636, C637 in front of
BCM3552.
Can you see t he normal wavefo rm?
YES
NO
JK70 5 may have problem. Replace th is Jack.
NO
Afte r c heck the patte rn be tween input of
BCM3552 and JK705 ,
You can su spect that PCB is bad.
YES
This bo ard has b ig problem becau se Main
chip(BCM3 552) have some trouble s.
Afte r c hecking thoro ugh ly all pa th onc e again,
You sh ou ld decid e to rep lace BCM3 552o r not.
Check JP7 029,JP7030.
Can you see t he normal wavefo rm?
YES
NO
JK70 5 may have problem. Replace th is Jack.
YES
Check the R756, R759 in fro nt of BCM3553.
Can you see t he normal wavefo rm?
NO
Afte r c heck the patte rn be tween input of
BCM3552 and JK705 ,
You can su spect that PCB is bad.
4. RGB_PC doesn’t display
