LG 49UF6700, Service Manual

Page: 17 / 57

- 17 -
LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLESHOOTING
1. No video (Main IC Block)
Ch
eck A
ud
io
(S
peaker
o
ut
)
Au
di
o O
K
Next
p
ag
e
(B
ack
-e
nd
b
lo
ck
)
Au
di
o N
G
Ch
eck st
an
d-
by
vo
ltag
e 3.
5V
P401/
P402 5,
7,
8 p
in
NG
Ch
eck P
ow
er
co
nn
ect
or
(24p
in
/28p
in
)
NG
Sh
or
t ch
eck
st
an
d-
by vo
ltag
e 3.
5V
NG
Re
pl
ac
e P
ow
er
b
oa
rd.
Ch
eck st
an
d-
by
vo
ltag
e 3.
5V
L400,
L401,
ZD
400,
C400,
C4
07
NG
Rep
lace
L400,
L401,
ZD
400,
C400,
C4
07
OK
Ch
eck X
-T
AL
X
101
NG
Rep
lace X
101
OK
Ch
eck
PO
W
ER
O
N si
gn
al
P401/
P402 1 p
in
Lo
w
Do
w
nl
oa
d s
of
tw
ar
e
(M
ai
n)
NG
Rep
lace I
C101
or
M
ai
n
Bo
ar
d
Ch
eck m
ul
ti vo
ltag
e
12V
, 24V
P401/
P402 11,
12,
13,
14,
15p
:
12V
P401/
P402
18,
19,
20,
21p
: 24V
NG
Ch
eck P
ow
er
co
nn
ect
or
(24p
in
/28p
in
)
NG
Sh
or
t ch
eck
m
ul
ti vo
ltag
e
12V
, 24V
NG
Re
pl
ac
e P
ow
er
b
oa
rd.
OK Hi
gh
Ch
eck M
ai
n I
C p
ow
er
b
lo
ck
IC
404 :
1.
5V
,
Q
406
: 3.
3V
IC
403 :
1.
1V
Rep
lace
IC
404,
Q
406,
IC
403
OK