LG 47LF66 (CHASSIS:LD75A) Service Manual ▷ View online
- 25 -
(4) In the case of becomes unusual display from side S-video/AV mode
Is Video input of the
AV Jack (P1400)
normal?
Check the input source.
Is normal the Input voltage,
IICCommunication and HV sync?
Yes
No
No
Replace IC
No
Replace IC
No
Is normal the
CXA2069Q?
Yes
Same as Block A
(5) In the case of becomes unusual display from Component, RGB mode
Is R,G,B input and
H,V Sync of the J1100
normal?
Yes
Check the input source.
No
Same as Block A
(6) In the case of becomes unusual display from HDMI mode
Is normal the
HDMI002 (IC1004)?
Yes
Is normal the Input voltage, IIC
Communication and HV sync?
No
Same as Block A
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(7) In the case of becomes unusual display from SCART1 mode
Is Video input
of A/V jack normal?
(J1200)
Yes
Check the input source.
No
Same as Block A
(8) In the case of becomes unusual display from SCART2 mode
Is Video input
of A/V jack normal?
(J1201)
Yes
Check the input source.
No
Same as Block A
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5. In case of no sound
(1) Symptom
1) LED is green.
2) Screen display but sound is not output
2) Screen display but sound is not output
(2) Check follow
All input (mode)
is no sound?
Is the speaker
On it men?
Set on speaker in
menu.
Is the speaker
Cable normal?
Check the Speaker
Cable
IC1300 operates
Normal?
Replace IC1300
(MSP4450)
IC1301 operates
Normal?
Replace IC1301
(STA335BW)
Replace VSC BD
Yes
No
Only HDMI is
No sound?
Yes
Download
the EDID data.
No
No
No
No
No
Only RF is
no sound?
no sound?
Yes
Check
the Tuner IN/OUT
No
Check the signal before
CXA2069 refer to circuit diagram
Only
AV/component/PC
input is no sound?
Yes
Only specific input
(except HDMI,
DTV,RF) is no
DTV,RF) is no
sound?
Yes
Is the output of
CXA2069 normal?
Check the signal after CXA2069
refer to circuit diagram
No
Replace CXA2069
No
Yes
Yes
Yes
Yes
No
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Common
Interface
LVDS 51P
AV
1
DTV Out
MNT
Out
RGB
RS-232
PC AUDIO
ST
i5100
MPEG Decoder
1.2V
2.5V
3.3V
5V
8V
FLI8548H-LF
(COR
TEZ Plus)
Digital V
ideo
Processor
1.8V
2.5V
3.3V
HDMI
HDMI
S/W
3.3V
Power
3.3V
ST
5V
12V
6V
19V
R
L
CXA2069Q
AUDIO/VIDEO
SW
9V
MSP4450K
Sound
Processor
9V
5V
ST
A333BW
Audio IC
18V
Buf
fer
3.3V
ICL3232
3.3V
V V V V
L L L L
R R R R
Y Y Y Y////CCCC
Component
YYYY
PPPP
bbbb
P
PPP
rrrr
LLLL
RRRR
RF IN
1.8V
3.3V
5V
D/A
T
otal
T
uner
TDFC-G336P
HDMI
S/PDIF
74LCX157
3.3V
74LCX157
3.3V
FE_TS_Data
TS_DA
T
A
CI_TS_Data
8Bit(656,27MHz)
CVBS,DTV L/R OUT
I2S, SPDIF_STI_OUT
I2S
I2S
SPDIF_MSP_OUT
SPDIF_OUT
TMDS
TMDS
HDMI_CEC
COMP Y/Pb/Pr
PC R/G/B/HV_SYNC
SCART
R/G/B/FB
I2S
SIDE A/V
SIF/AM_AUDIO
COMP & PC R/LIN
AV R/L
OUT
TV R/L OUT
TV R/L
OUT
SCART
V,R/LIN
DTV/MNT
V,R/L
OUT
TU_MAIN
TV_VOUT
V
,Y/C
L/R
MAIN_V/Y/C OUT
REC8
12V
LVDS
RX/TX
DEMUX
3.3V
3.3V
RX/TX
COR_STI_SW
OAD_CONT
COMM_
UAR
T_TX
COMM_
URT_RX
UAR
T0_RX
UAR
T1_RX
UART0_TX
UART1_TX
OAD_CONT
Sound Signal
V
ideo Signal
Sound&V
ideo
Signal
RX/TD Signal
Etc. Signal
DEBUG_UART_TX
DEBUG_UART_TX
UAR
T0_RX
UAR
T0_TX
DEMUX
BLOCK DIAGRAM
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