LG 42LG3RC (CHASSIS:LP81F) Service Manual ▷ View online
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7. Unusual display from component 1 mode
Yes
Is video
input of the Com1
Jack normal? (Check
R8011/12/13)
Check the input source.
Change IC801.
No
8. Unusual display from component 2 model
Yes
Is video
input of the Com2
Jack normal? (Check
R8030/32/33)
Check the input source.
Change IC801.
No
9. Unusual display from RGB model
Yes
Is video
input of the Com2
Jack normal? (Check
R8035/37/39)
Check the input source.
Change IC801.
No
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Set on speaker
in menu.
in menu.
Download the
EDID data.
EDID data.
Check the signal after
IC600 refer to circuit
diagram.
IC600 refer to circuit
diagram.
No
No
No
Replace speaker B/D.
No
No
Check the Speaker
cable.
cable.
No
Replace IC600.
No
Replace IC801
No
Yes
Yes
All input(mode)
is no sound.
All input(mode)
is no sound.
Is the speaker
cable normal?
cable normal?
Is the speaker
on it menu?
Yes
Only AV/COM2/PC
input is no sound.
Is the output of
IC600 normal?
IC600 normal?
Yes
Yes
Only RF is no sound.
Yes
Is IC801 operated
normality?
Yes
Replace IC601
Replace Main B/D.
No
Is IC601 operated
normality?
Yes
10. 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 process
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AV1 in
SideAV in
(AV2 in)
Comp1 in
Comp2 in
RGB in
(D/L)
CVBS IN
Y/Pb/Pr IN
R/G/B/HS/VS IN
CVBS IN
LINE OUT
LINE
IN
AMP_MUTE
RS-232C
Rx/Tx
MX3232
RF
(Tuner)
PC Audio
in
DISPLAY MODULE
EDID NVM
EDID NVM
HDMI1
HDMI2
HDMI3
USB
TMDS351PAG
HDMI MUX
Zoran
VADDIS-966XD
MPEG Decoder
DDR MEM
DDR MEM
SERIAL
FLASH
Mstar
Romeo
LGE6891CD
TW9910
Sub Decoder
NTP3000A
Digital
Audio AMP
MAIN NVM
MC74HC4066
Audio SW
LM324
X4 AMP
SERIAL
FLASH
BD2041
Protect IC
EDID NVM
DDC/HDP/CEC
TMDS(HDMI in)
DDC/HPD/CEC
TMDS(HDMI in)
TMDS(HDMI in)
USB(AV I/O, Data I/O)
+5V
CVBS
OUT
656 IN
SW_RESE
T
PART_I2
C
PART_I2C
SW_RESE
T
I2S OUT
LVDS
MPEG RX/TX
MPEG RESET
I2S IN
656 IN
TMDS(HDMI in)
DDC/HPD/CEC
DDC/HPD/CEC
[CEC not through HDMI MUX, direct JACK to MAIN IC]
DDC
DDC
DDC
UART_Rx/Tx
AUDIO_SW
LINE
IN
LINE
IN
LINE
IN
Y/Pb/Pr IN
LINE
IN
Y/C IN
LINE
IN
EDID NVM
ROM_I2C
DSUB_DDC
x0.55
x0.55
x0.55
x0.55
S_VIDEO_DET
LINE_MUTE
LINE OUT
x4
x0.55
LINE
IN
CVBS IN
SIF IN
TUNER_I2C
PART_I2C
HDMI_SEL
(Option)
(Option)
(Option)
TPA3107D
Audio Amp
Spk
O
u
t
1W(Mono)
SW_RESET
BLOCK DIAGRAM
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510
300
200
120
122
500
901
900
801
804
803
530
802
550
830
805
806
522
821
540
400
121
200T
200N
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.
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
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