Read LG 32LB9D (CHASSIS:LA75C) Service Manual online
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Chec k JP7001, J7015.
Can yo u s ee t he n o rm al w avef o rm ?
Chec k t he L700, L704.
Can yo u s ee t he n o rm al w avef o rm ?
Chec k t he C638, C628 in f ro n t o f BCM35 53.
Can yo u s ee t he n o rm al w avef o rm ?
YES
YES
NO
JK700, JK702 m ay have p ro b lem . Rep lac e t his Jac k.
NO
Rep lac e t he Part ( L70 0, L704)
NO
Af t er c hec k t he p at t ern b et w een L703 and C651,
Yo u c an s us p ec t t hat PCB is b ad .
YES
Thi s b o ard has b i g p ro b lem b ec aus e Main
c hip ( BCM3553) have s o m e t ro ub les .
Af t er c hec ki n g t ho ro ug hly all p at h o n c e ag ai n ,
Yo u s ho uld d ec i d e t o rep lac e BCM3553 o r no t .
3. Component doesn’t display
Chec k JP7032, JP7033, JP7034.
Can yo u s ee t he no rm al w avef o rm ?
Can yo u s ee t he no rm al w avef o rm ?
Chec k t he C635, C636, C637 in f ro n t o f
BCM35 52.
Can yo u s ee t he no rm al w avef o rm ?
YES
NO
JK705 m ay have p ro b lem . Rep lac e t hi s Jac k.
NO
Af t er c hec k t he p at t ern b et w een in p ut o f
BCM355 2 an d JK705 ,
Yo u c an s us p ec t t hat PCB is b ad .
YES
This b o ard has b ig p ro b lem b ec aus e Mai n
c hip ( BCM35 52) have s o m e t ro ub les .
Af t er c hec kin g t ho ro ug hly all p at h o nc e ag ain ,
Yo u s ho uld d ec id e t o rep lac e BCM3 552 o r n o t .
Chec k JP7029, JP7030.
Can yo u s ee t he n o rm al w avef o rm ?
Can yo u s ee t he n o rm al w avef o rm ?
YES
NO
JK705 m ay have p ro b lem . Rep lac e t his Jac k.
YES
Chec k t he R758, R759 in f ro n t o f BCM3 552.
Can yo u s ee t he n o rm al w avef o rm ?
NO
Af t er c hec k t he p at t ern b et w een in p ut o f
BCM3552 an d JK705 ,
Yo u c an s us p ec t t hat PCB is b ad .
4. RGB_PC doesn’t display
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