LG 42LG2000 (CHASSIS:LD84A) Service Manual ▷ View online
- 17 -
Yes
No
Check the input source.
If there is normal status,
Replace main board.
Same as Block A.
Same as Block A.
No
Check the IC700.
No
Yes
Is video
input of SCART Jack
normal?(Check JK600,
JK601_Pin20)
Check the input source.
Is video
input of the RGB Jack
normal?(Check JK600
_Pin7,11,15)
No
If there is normal status,
Replace main board.
Is waveform
of Switching IC normal?
(Check IC700_Pin11,
12,13)
5. Unusual display from AV1/AV2(SCART) mode
- CVBS Input
- RGB Input
6. Unusual display from AV3(SIDE AV) mode
- CVBS Input
Yes
No
If there is normal status,
Replace main board.
Same as Block A.
Is video input
of RCA Jack normal?
(Check R704)
Check the input source.
7. Unusual display from Component mode
- CVBS Input
Yes
No
If there is normal status,
Replace main board.
Same as Block A.
Is video input
of the Component Jack
normal?(Check R733,
734,735)
Check the input source.
- 18 -
Check the input source.
Same as Block A.
No
Check the IC700.
No
Yes
Is video input
of the RGB jack normal?
(Check JK703_Pin1,
2,3,13,14)
No
If there is normal status,
Replace main board.
If there is normal status,
Replace main board.
Is waveform
of Switching IC normal?
(Check IC700_Pin11,
12,13)
8. Unusual display from RGB mode
Check the input source.
Same as Block A.
No
Check the IC900, IC901, IC903.
No
Check the IC902 and DHCP value
No
Check the IC902.
No
Yes
Is video
input of the HDMI jack
normal? (Check JK900,
901,902)
Yes
Check DDC
communication
lines(IC900,901,903
_Pin5,6
Yes
Check HDCP
communication lines
(IC902)
No
Is waveform
of Switching IC normal?
(Check IC902)
9. Unusual display from HDMI 1/2/3 mode
- 19 -
Yes
No
Set on speaker on menu.
Download the EDID data.
Check the Tuner in/Out.
No
Check th Speaker cable.
No
Replace IC100.
No
Replace IC1000.
Replace main board.
No
Yes
No
No
All input is no sound?
Only HDMI is
no Sound?
Only RF or DTV
is no sound?
Is the speaker
“on” on menu?
Is the Speaker
cable normal?
10. No Sound
(1) Symptom
1) LED is blue
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check process
Yes
IC100 operate
normally?
Yes
IC1000 operate
normally?
Yes
Yes
Change Main bord.
S/W download and set White Balance value.
Before change Main Board,
Check S/W version and White Balance value.
Check S/W version and White Balance value.
* Caution
- 20 -
BLOCK DIAGRAM
LVDS
S
C
2_L/
R_
IN
Saturn3+
S
T
M
A
V340
(I
C
700
)
NT
P3000A
(IC1000)
SP
(R)
SP
(L)
P1000
5
V
_ANT
_MNT
CI Slot
(P800)
EEP
RO
M
K
IA7427
(I
C
104
)
24
C512
(I
C
105
)
I2
C_
D_
T
U
/
I2
C_
A
_
T
U
KE
Y
1
/2
TV Tuner
B
OOSTER
SIF
TV
_CV
BS
DDR Memor
y
256Mb (IC3
00)
SC1_R/G
/B
DSUB
_R/
G/B
R/
G/
B
P
C
_L/
R_
IN
COMP
_
Y
/P
b/
Pr
COMP
_
L
/R_
IN
DSUB
_H/
V
_
S
Y
N
C
M
A
X3232
(I
C
702
)
DDC/U
A
RT-T
x
/Rx
HDMI
Sw
it
ch
(IC902)
EEP
RO
M
HDMI_
I2
C
HDMI_
I2C_
0
HDMI_CEC/Rx/
HPD
TM
D
S
x
3
HP
D x
3
HD
M
I_C
E
C
x
3
USB
_DM/DP
5
V
_HDMI
PCM_ADD
PCM_DATA
TS_Parallel
TU_T
S
_
DA
TA
KIC7SZ32FU
(I
C
802
)
PCM_CD_ON
C
I_
C
D_1/2
II
S
MUTE
L
E
D_
G/R &
IR
Flash Memor
y
4MB (IC101)
S
C
1_
CV
BS_I
N
S
C
2_
CV
BS_I
N
S
C
1_T
V_VO
U
T
DTV/MNT_V
_
OUT
S
C
1_L/
R_
IN
T
V
_L
/R
_O
U
T
DTV/MNT_
L/R
_
OUT
LCD Panel
52/47/42/37”
: F
H
D
32”: : HD
RES
ET
I2
C
I/O Expander
(IC103)
I2
C
_
A_
T
U
TS_Serial
74LV
C
541A
(I
C
800
)
Flash Memor
y
4MB (IC102)
DDR Memor
y
256Mb (IC3
00)
EEP
RO
M
EEP
RO
M
Side_Y/C/V/L/R
SPDIF Out
IIC(E
ye
Q II)
T
P
A6110A2
(I
C
1002
)
Head phone Out
74
H
C
4066
(I
C
1001
)
Click on the first or last page to see other 42LG2000 (CHASSIS:LD84A) service manuals if exist.