52LG70-UA (CHASSIS:LA86A) - LG TV Service Manual (repair manual). Page 24

Read LG 52LG70-UA (CHASSIS:LA86A) Service Manual online

- 24 -
C
2008
HDMI
Check input connect JK600,J
K601,JK708
Can 
you se
e the normal 
w
a
vef
orm?
Check DDC communication lines
(IC601, IC602, 
IC603, IC701)
JK600,JK601,JK708 may hav
e problem. Replace this Jack.
Check the outp
ut of PI3HDMI341AT
R(IC600)
_HDMI1,2,3 or 
T
M
DS141HAR
(IC703)_
HDMI
4. . 
Can 
you se
e the normal 
w
a
vef
orm?
After checking 
the Po
w
e
r of this chip, 
y
ou should decide to replac
e this or not.
Check HDCP communication lines(IC102)
After checking 
the Po
w
e
r of this chip, 
y
ou should decide to replac
e this or not.
YES
YES
YES
NO
NO
NO
Video
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.
Check all po
w
e
r domain of FR
C-9459M (IC1000)
(3.3V, 1.3V_CORE,1.3V_PLL,3.3V,1.8V,2.5V) 
& cry
stal output (X
1000 / 20.25MHz)&FRC_RESET
Measure Po
w
e
r & 
w
a
veform a
t L1008,L1
007,
L100
2,L10
13,
L1014,L1015~
L1018&C1006&R1029
because its more eas
y to check.
Can 
you se
e the normal 
w
a
vef
orm?
YES
T
h
is board has
 big prob
lem b
e
cause F
RC c
h
ip(F
RC-
945
9
M) have some 
troubles.
After checking 
thoroug
hl
y al
l p
a
th once ag
ain
, You should d
e
cide
to rep
lac
e
 
FRC-945
9M.
Althoug
you r
eplac
e it, 
y
ou c
annot see n
o
rm
al disp
la
y, de
cide to repl
ace 
Main chi
p(BC
M3553)
YES
Page of 36
Display

Click on the first or last page to see other 52LG70-UA (CHASSIS:LA86A) service manuals if exist.