MHC-V44D
26
SMPS Board Diagnosis Flow (1/2)
SECTION 5
TROUBLESHOOTING
The o
ut
put from SM
PS b
oard c
heck a
s be
low.
AC
IN
Ye
s
Ye
s
No
No
Ye
s
A
Check
w
hether th
e state of a
cable an
d o
utlet are norm
al.
If there are no problems, please check circum
ference circui
t
for m
ain-on fro
m
MOTHERBOARD board side.
The b
oard is function n
orm
al
ly.
The P
ow
er control signa
l to SM
PS
b
oard con
dition check
below.
(Check SMPS board only)
NO001
Pin3, 6-7 = GND
Pin 9 = 3.3V
NO002
Pin 1-6 = GND
(Connect NO001 and NO002 together when grounding)
(1) AC
input
(2) F901 – Fuse
(3) Sub power transformer
(4) NO
00
1
(7
) F
U
SE
R
ESI
ST
OR
(8) MO
SF
ET
(9) B
R
IDG
E DIO
D
E
Pin1:13.5
V
Pin3:
AG
ND
Pin4-5: 13.5
V
Pin6-7: M/DG
ND
Pin8: A
C-D
ET
Pin9: MAIN-ON
Pin1-6: V1 G
N
D
Pin7-11: V1
(5) Mai
n pow
er tran
sform
er
(6) NO
00
2
NO
00
1
Pin1, 4, 5 = 13.5
V (Sta
nd
by
, Demo, Power on)
NO
00
2
Pin7-11 = 36
V (P
ower on
), 0V
(Stand
by & Demo)
(5
)
(7
)
(1
)
(2
)
(9
)
(6
)
(4
)
(3
)
(8
)