LG 32LP620H (CHASSIS:LA3AA) Service Manual ▷ View online
- 21 -
RGB-PC Video Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check P900
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at R4025, R4042 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace P900
N
Analog RF Audio Trouble Shooting guide
Check RF cable & signal
Check tuner SIFoutput.
xxLP620H (TU3002 Pin#6)
xxLP645H (TU3001 Pin#1)
Y
Check Audio AMP output
L503,L504,L505,L506
Y
Check IC501
Y
Check C250
(SIF signal to IC101)
Replace Tuner
N
Replace L503,L504,L505,L506
Replace IC501
N
N
Replace IC101
Y
- 22 -
Composite / RGB-PC Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK1700, P800
Can you see the normal waveform?
Y
Check the input of Mstar(IC101).
Measure waveform at C236, C237, C244, C245 because it’s more easy to check.
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK1700, P800
N
Check Audio AMP output
L503,L504,L505,L506
Replace L503,L504,L505,L506
N
Y
HDMI Audio in Trouble Shooting guide
Check input signal format.
Is it supported?
Y
Check AC cable for damage
For damage or open conductor
Y
Check JK800, JK801, JK802
Can you see the normal waveform?
Y
This board has big problem because Main chip (Mstar) have some troubles.
After checking thoroughly all path once again, You should decide to replace Mstar or not.
Replace JK800, JK801, JK802
N
Check Audio AMP output
L503,L504,L505,L506
Replace
L503,L504,L505,L506
N
Y
- 23 -
BLOCK DIAGRAM
D
D
R
2
(2
G
b
it)
H
5T
Q
2G
63
BF
R
-H
9C
IC
12
01
N
AN
D
F
la
sh
(2
G
b
it)
H
Y2
7U
F0
82
G
2B
-T
PC
B
IC
10
2
D
ig
ita
l AMP
N
TP7
50
0L
IC
50
1
I2S
A_
D
at
a[
0:
15]
,
D
D
R
2
(1
G
b
it)
H
5T
Q
1G
63
D
FR
-H
9C
IC
12
02
B_
D
at
a[
0:
15]
,
Ad
dr.
[ ]
, c
trl,
D
QS,
D
M
…
PC
M
_A
[0
…
7]
IF
N
/P
SI
F
TU
_C
VBS
X-
ta
l
R
es
et
/
IF
_AGC
…
SD
A/
SC
L_5V
R
es
et
S
w
itc
h
C
S
,R
E,
W
E……
R
X/
TX
Mi
co
m
(MSP4
30
F5
41
9I
PZ
R
)
IC
50
02
24M
H
z
JA
C
K
PA
C
K
at
R
EA
R
SC
L,
SD
A_
3.
3V
R
F
S7
LR
2(
LG
E2
11
1A
-T
E)
IC
10
1
R
S-
23
2C
(SVC
o
nl
y)
S/
W
R
es
et
EXT
_SPEAKER
OU
T
I2
C
(S
C
L/
SD
A)
S_
FL
ASH
(8
M
bi
t)
MX2
5L
80
06
EM2
I-1
2G
IC
20
0
Po
w
er
AMP
TPA3
12
4D
2PW
PR
IC
18
02
JK17
03
JK17
06
R
JP_
C
TR
L
Pro
:Id
om
LG
D
T1
00
1
IC
12
09
TS_C
LK,
VALI
D
,SYN
C
,0
~7
PM
_T
S_C
LK,
VALI
D
,SYN
C
,0
~7
TD
SS
-H
10
1F
Ga
m
e
co
nt
rol
H
D
MI
1
H
D
MI
2
R
G
B
PC
C
om
po
si
te
U
SB
R
GB/
H
/V
C
VBS,
L
/R
R
GB
Aud
io
IN
SI
D
E_U
SB_D
P/
D
M
/ +
5V
JA
C
K
PA
C
K
at
Si
de
H
D
MI
3
O
PT
IC
AL
AU
D
IO
O
U
T
- 24 -
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
A2
A9
A10
900
200
400
540
521
530
500
301
910
120
300
510
123
200T
122
121
Set + Stand
Stand Base
+
Stand Body
LV
1
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