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12-2 Fault Diagnosis by Symptom
12-2-1 No Power (completely dead)-Initial diagnosis
1
.
C
h
e
c
kl
i
s
t
:
1
)
Is
in
pu
t
vol
t
age
n
ormal?
2)
Is AC power l
in
ked
c
3)
Is
in
pu
t
vol
t
age o
f
DC regula
4
)
Is ou
t
pu
t
vol
t
age o
f
DC regula
2.
Troubles
h
oo
tin
g pro
c
edure
U
n
plug
plug
Power Bu
remo
t
e
c
o
C
h
C
2
w
i
res o
c
o
nn
e
t
erm
C
th
e
f
u se o
n th
FUSE
(
F
C
h
SMPS o
I
n
pu
t
power: AC
IC
02
IC
02
C
h
e
c
k
Samsu
n
g Ele
ct
ro
nic
s
orre
ct
ly?
t
or IC KA
780
5
(
IC
02) n
t
or IC KA
780
5
(
IC
02) n
th
e power
c
ord a
n
d
it
a
ft
er
30
se
c
o
n
ds
Press
th
e
tt
o
n
o
n th
e
nt
rol u
nit t
o opera
t
e
th
e
a
i
r
c
o
n
d
iti
o
n
er
does
n
o
t
opera
t
e
e
c
k
th
e
in
door u
nit
c
o
nt
rol board
Yes
h
e
c
k w
h
e
th
er
f
power
c
ord are
ct
ed
c
orre
ct
ly
t
o
th
e
in
al blo
c
k a
n
d
c
o
nt
rol board
.
Yes
h
e
c
k w
h
e
th
er
e
c
o
nt
rol board
i
s
n
ormal
.
70
1
)
: T
3.
15[A]/
2
5
0
[V]
Yes
e
c
k
th
e ou
t
pu
t
o
f
n th
e
c
o
nt
rol board
.
230
±15%[V]
I
n
pu
t
: DC1
2
[V]
ou
t
pu
t
: DC5[V]
Yes
th
e se
ttin
g
t
empera
t
ure
ormal?
(
11VDC-1
2.
5VDC
)
ormal?
(
4
.
5VDC-5
.
5VDC
)
opera
t
e
No
No
No
C
h
e
c
k
th
e d
i
splay board
Re
c
o
nn
e
ct
w
i
res
c
orre
ct
ly
Repla
c
e
f
u se
PCB s
h
ould be repla
c
ed
1
2
-
2
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