Read LG 52LG70-UA (CHASSIS:LA86A) Service Manual online
- 28 -
C
2008
S
peaker
Audio(Out)
Check the outp
ut (Pin AK25,AL25,AJ25) of B
C
M3553(IC100).
Measure
w
a
vef
orm at R2635,
R2636,R2637
because its more eas
y to check.
Can you see the normal signa
l?
Check the input (Pin 17,18,19) of N
T
P3000((
IC501).
Can
you se
e the normal
w
a
vef
orm?
YES
NO
NO
T
h
is board has big problem because Main c
h
ip(BCM3553) have some troubles.
After checking
thoroug
hl
y al
l p
a
th once ag
ain
,
You should decide to replace
BCM3553 or not.
After checking audio signal line,
y
ou sh
ould decide to replac
e
item or not.
YES
Check the output (Pin 30,31,3
6,37,47,48,53,54) of NT
P3000((IC501).
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking
the Po
w
e
r & I2C & Reset of this chip,
yo
u shou
ld dec
ide to repl
ace this or not.
Check the speaker output
w
a
fer P501.
Can
you se
e the normal
w
a
vef
orm?
NO
YES
After checking audio signal line,
y
ou sh
ould decide to replac
e
item or not.
Check the connector & Speaker
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