77
420WN6 LCD TV
Go to cover page
Repair
T
ips
0. W
ar
n
i
ng
All IC
s a
nd m
a
ny oth
er se
m
i
-conducto
rs are s
u
s
c
ep
t
i
bl
e
to
e
l
e
ct
r
o
s
t
a
t
i
c d
is
ch
ar
g
es
(ESD). C
are
l
ess
h
a
ndl
i
ng du
ri
ng
repair
c
a
n
re
duc
e
l
i
f
e
d
ras
t
i
c
a
lly. Wh
e
n
repairi
ng, m
a
k
e s
u
re
th
a
t you
are
conn
e
ct
e
d w
i
th th
e sa
m
e p
ot
e
nt
ia
l
as
th
e
m
ass
of th
e
un
i
t v
ia a
w
ris
t w
rap
w
i
th
resis
t
a
nc
e
. K
eep
com
p
on
e
nt
s
a
nd tool
s a
l
s
o
a
t th
e sa
m
e p
ot
e
nt
ia
l !
1. S
er
v
i
c
i
ng of SMD
s
(Su
r
f
a
c
e
Mount
e
d D
e
v
i
c
es
)
1.1 G
e
n
era
l c
a
ut
i
on
s
on h
a
ndl
i
ng
a
nd
s
to
ra
g
e
- Ox
i
d
a
t
i
on on th
e
t
er
m
i
n
a
l
s
of SMD
s res
ult
s i
n
p
oo
r s
old
eri
ng.
Do not h
a
ndl
e
SMD
s
w
i
th b
are
h
a
nd
s
.
- Avo
i
d u
si
ng
s
to
ra
g
e p
l
a
c
es
th
a
t
are se
n
si
t
i
v
e
to ox
i
d
a
t
i
on
s
uch
as p
l
a
c
es
w
i
th
s
ul
p
hu
r
o
r
chlo
ri
n
e
g
as
, d
ire
ct
s
unl
i
ght,
h
i
gh t
e
m
pera
tu
res
o
r a
h
i
gh d
e
g
ree
of hum
i
d
i
ty. Th
e
c
apa
c
i
t
a
nc
e
o
r resis
t
a
nc
e
v
a
lu
e
of th
e
SMD
s
m
a
y b
e
a
ff
e
ct
e
d by th
is
.
-
R
ough h
a
ndl
i
ng of c
ir
cu
i
t bo
ar
d
s
cont
ai
n
i
ng SMD
s
m
a
y
c
a
u
se
d
a
m
a
g
e
to th
e
com
p
on
e
nt
s as
w
e
ll
as
th
e
c
ir
cu
i
t
bo
ar
d
s
. C
ir
cu
i
t bo
ar
d
s
cont
ai
n
i
ng SMD
s s
hould n
e
v
er
b
e
b
e
nt o
r
fl
e
x
e
d. D
i
ff
ere
nt c
ir
cu
i
t bo
ar
d m
a
t
eria
l
s e
x
pa
nd
a
nd
cont
ra
ct
a
t d
i
ff
ere
nt
ra
t
es
wh
e
n h
ea
t
e
d o
r
cool
e
d
a
nd th
e
com
p
on
e
nt
s a
nd/o
r s
old
er
conn
e
ct
i
on
s
m
a
y b
e
d
a
m
a
g
e
d
du
e
to th
e s
t
ress
. N
e
v
er r
ub o
r s
c
rape
ch
ip
com
p
on
e
nt
s as
th
is
m
a
y c
a
u
se
th
e
v
a
lu
e
of th
e
com
p
on
e
nt to ch
a
ng
e
.
S
i
m
i
l
ar
ly, do not
s
l
i
d
e
th
e
c
ir
cu
i
t bo
ar
d
a
c
r
o
ss a
ny
s
u
r
f
a
c
e
.
1.2
Re
mov
a
l of SMD
s
- H
ea
t th
e s
old
er
(fo
r
2-3
se
cond
s
)
a
t
ea
ch t
er
m
i
n
a
l of th
e
ch
ip
. By m
ea
n
s
of l
i
tz w
ire a
nd
a s
l
i
ght ho
ri
zont
a
l fo
r
c
e
,
s
m
a
ll com
p
on
e
nt
s
c
a
n b
e re
mov
e
d w
i
th th
e s
old
eri
ng
ir
on.
Th
e
y c
a
n
a
l
s
o b
e re
mov
e
d w
i
th
a s
old
er s
uck
er
(
see
F
i
g.
1A)
Wh
i
l
e
hold
i
ng th
e
SMD w
i
th
a pair
of tw
ee
z
ers
, t
a
k
e i
t off g
e
ntly u
si
ng th
e
s
old
eri
ng
ir
on'
s
h
ea
t
app
l
ie
d to
ea
ch t
er
m
i
n
a
l (
see
F
i
g. 1 B).
-
Re
mov
e
th
e e
xc
ess s
old
er
on th
e s
old
er
l
a
nd
s
by m
ea
n
s
of
l
i
tz w
ire
o
r a s
old
er s
uck
er
(
see
F
i
g. 1C).
1.3 C
a
ut
i
on on
re
mov
a
l
- Wh
e
n h
a
ndl
i
ng th
e s
old
eri
ng.
ir
on. u
se s
u
i
t
a
bl
e press
u
re a
nd b
e
c
are
ful.
- Wh
e
n
re
mov
i
ng th
e
ch
ip
, do not u
se
undu
e
fo
r
c
e
w
i
th th
e pair
of tw
ee
z
ers
.
- Th
e s
old
eri
ng
ir
on to b
e
u
se
d (
appr
ox. 30 W)
s
hould
pre
f
era
bly b
e e
qu
ippe
d w
i
th
a
th
er
m
a
l cont
r
ol (
s
old
eri
ng
t
e
m
pera
tu
re
: 225 to 250 C).
- Th
e
ch
ip
, onc
e re
mov
e
d, mu
s
t n
e
v
er
b
e re
u
se
d.
1.4 Att
a
chm
e
nt of SMD
s
- Loc
a
t
e
th
e
SMD on th
e s
old
er
l
a
nd
s
by m
ea
n
s
of tw
ee
z
ers
a
nd
s
old
er
th
e
com
p
on
e
nt on on
e si
d
e
. En
s
u
re
th
a
t th
e
com
p
on
e
nt
is p
o
si
t
i
on
e
d co
rre
ctly on th
e s
old
er
l
a
nd
s
(
see
F
i
g.2A).
- N
e
xt com
p
l
e
t
e
th
e s
old
eri
ng of th
e
t
er
m
i
n
a
l
s
of th
e
com
p
on
e
nt (
see
F
i
q. 2B).
2. C
a
ut
i
on wh
e
n
a
tt
a
ch
i
ng SMD
s
- Wh
e
n
s
old
eri
ng th
e
SMD t
er
m
i
n
a
l
s
, do not touch th
e
m
d
ire
ctly w
i
th th
e s
old
eri
ng
ir
on. Th
e s
old
eri
ng
s
hould b
e
don
e as
qu
i
ckly
as p
o
ssi
bl
e
, c
are
mu
s
t b
e
t
a
k
e
n to
a
vo
i
d
d
a
m
a
g
e
to th
e
t
er
m
i
n
a
l
s
of th
e
SMD
s
th
e
m
se
lv
es
.
- K
eep
th
e
SMD'
s
body
i
n cont
a
ct w
i
th th
e pri
nt
e
d bo
ar
d wh
e
n
s
old
eri
ng.
- Th
e s
old
eri
ng
ir
on to b
e
u
se
d (
appr
ox. 30 W )
s
hould
pre
f
era
bly b
e e
qu
ippe
d w
i
th
a
th
er
m
a
l cont
r
ol (
s
old
eri
ng
t
e
m
pera
tu
re
: 225 to 250 C).
- Sold
eri
ng
s
hould not b
e
don
e
out
si
d
e
th
e s
old
er
l
a
nd.
- Sold
eri
ng flux (of
r
o
si
n) m
a
y b
e
u
se
d, but
s
hould not b
e
a
c
i
d
i
c.
- Aft
er s
old
eri
ng, l
e
t th
e
SMD cool down g
ra
du
a
lly
a
t
r
oom
t
e
m
pera
tu
re
.
- Th
e
qu
a
nt
i
ty of
s
old
er
mu
s
t b
e pr
o
p
o
r
t
i
on
a
l to th
e si
z
e
of th
e
s
old
er
l
a
nd. If th
e
qu
a
nt
i
ty
is
too g
rea
t, th
e
SMD m
i
ght
c
ra
ck o
r
th
e s
old
er
l
a
nd
s
m
i
ght b
e
to
r
n loo
se
f
r
om th
e
pri
nt
e
d bo
ar
d (
see
F
i
g. 3).
F
i
g.3 Ex
a
m
p
l
es
Ri
ght
Summary of Contents for BDL4221V/00
Page 39: ...39 420WN6 LCD TV Go to cover page BLOCK DIAGRAM Main Board ...
Page 40: ...Go to cover page ...
Page 41: ...41 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 42: ...Go to cover page ...
Page 43: ...43 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 44: ...Go to cover page 420WN6 LCD TV 44 SCALER DIAGRAM ...
Page 45: ...45 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 46: ...Go to cover page 420WN6 LCD TV 46 SCALER DIAGRAM ...
Page 47: ...47 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 48: ...Go to cover page 420WN6 LCD TV 48 SCALER DIAGRAM ...
Page 49: ...49 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 50: ...Go to cover page 420WN6 LCD TV 50 SCALER DIAGRAM ...
Page 51: ...51 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 52: ...Go to cover page 420WN6 LCD TV 52 SCALER DIAGRAM ...
Page 53: ...53 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 54: ...Go to cover page ...
Page 55: ...55 420WN6 LCD TV Go to cover page SCALER DIAGRAM ...
Page 56: ...Go to cover page 420WN6 LCD TV 56 SCALER BOARD C B A ...
Page 57: ...57 420WN6 LCD TV Go to cover page SCALER BOARD C B A ...
Page 58: ...Go to cover page ...
Page 59: ...59 420WN6 LCD TV Go to cover page POWER BOARD C B A ...
Page 60: ...Go to cover page ...
Page 61: ...61 420WN6 LCD TV Go to cover page IR CONTROL DIAGRAM ...
Page 62: ...Go to cover page 420WN6 LCD TV 62 IR CONTROL BOARD C B A ...
Page 63: ...63 420WN6 LCD TV DSUB DIAGRAM Go to cover page ...
Page 64: ...DSUB C B A 64 420WN6 LCD TV Go to cover page ...
Page 65: ...65 420WN6 LCD TV DSUB C B A Go to cover page ...
Page 66: ...TUNER DIAGRAM FOR 420WN6QS 93 AND 420WN6QS 97 66 420WN6 LCD TV Go to cover page ...
Page 67: ...67 420WN6 LCD TV Go to cover page TUNER C B A FOR 420WN6QS 93 AND 420WN6QS 97 ...
Page 68: ...TUNER C B A FOR 420WN6QS 93 AND 420WN6QS 97 68 420WN6 LCD TV Go to cover page ...