Read LG 52LG72-UA (CHASSIS:LA86B) Service Manual online
- 33 -
C
2008
S
peaker
Audio(Out)
Check th
e o
u
tput (Pin
A
K
25
,A
L25,
A
J
25) o
f BCM355
x(IC
100).
Measure
w
a
v
e
form at R263
5
,R2636,R
263
7 b
ecause itís mo
re eas
y
to
check.
Can y
ou see t
h
e n
o
rmal sign
al?
Check the input (Pin 17,18,19) of NTP3000((IC501).
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
NO
NO
NO
NO
This board ha
s big
problem
because Main chip(BCM355x) ha
v
e
some troubles.
A
ft
e
r ch
ec
kin
g th
orou
ghly
all p
a
th
once again
, You
sho
uld d
ecid
e
to rep
lace BCM
355x o
r n
o
t.
A
ft
e
r checking audio signal line, y
o
u should
decide to
replace item or not.
YES
Check the output (Pin 30,31,36,37,47,
48,53,54) of NTP3000((IC501).
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
A
ft
e
r checking the Po
w
e
r &
I2C & Reset of this chip, y
o
u should
decide to replace this or not.
Check the spe
aker output
w
a
fer P501.
Can y
ou see t
h
e n
o
rmal
w
a
v
e
form?
YES
A
ft
e
r checking audio signal line, y
o
u should
decide to
replace item or not.
Check the connector & Speaker
Click on the first or last page to see other 52LG72-UA (CHASSIS:LA86B) service manuals if exist.