LG 55LM7600 (CHASSIS:LJ22E) Service Manual ▷ View online
P4102
1
SCL
2
SDA
3
GND
4
KEY1
5
KEY2
6
St 3.5V
7
GND
8
RED_LED
9
IR
10
GND
Checking order
1, 2. Check IR cable condition between IR & Main board.
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
3. Check the st-by 3.3V on the terminal 6.
4. When checking the Pre-Amp when the power is in ON condition, it is normal when the Analog
Tester needle moves slowly, and defective when it does not move at all.
Remote controller operation checking method
D. Function error_ No response in remote controller,
key error
<ALL MODELS>
A27
Established
date
Revised
date
Error
symptom
Content
LCD TV
①
②
③
④
2010. 12 .14
Standard Repair Process Detail Technical Manual
Sequence of the Vcom adjustment
D. VCOM Adjustment
1. Case
■ LCD module change
■ T-Con board change
■ T-Con board change
2. Equipment
■ Service Remote controller
3. Adjust sequence
■ Press the ‘adj’ key
■ select V-COM
■ As pushing the right or the left button on the remote controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press the exit key and finish the VCOM adjustment.)
■ Push the OK key to store the value. Then the message “Saving OK” is pop.
■ Press the exit key to finish V-COM adjustment.
■ select V-COM
■ As pushing the right or the left button on the remote controller, And find the V-COM value Which is no or
minimized the Flicker.
(If there is no flicker at default value, Press the exit key and finish the VCOM adjustment.)
■ Push the OK key to store the value. Then the message “Saving OK” is pop.
■ Press the exit key to finish V-COM adjustment.
A28
Established
date
Revised
date
Error
symptom
Content
LCD TV
2010. 12 .14
Standard Repair Process Detail Technical Manual
5. Block Diagram for Middle-end models(Main B’D)
L/R In
SPDIF OUT
USB
Audio
AMP
(NTP7500
or STA380)
I2S Out
Main
Soc
CVBS
ISDB-T
Demod
Demod
FE_TS_DATA[8]
USB1
RS-232C
only Dev
PC-RGB
PC-AUDIO
OPTIC
LAN
SYSTEM
DDR3
X
1600 X
16
(2Gb)
HDMI1
HDMI2
HDMI3
Side
Rear
RGB,H/V
Ethernet
CVBS
UART
SYSTEM EEPROM X 1
(256Kb)
HDMI
MUX
(HDCP
EEPROM)
M-Remote
Module
Air
Analog 2~69ch
Digital 2~69ch
Analog 2~69ch
Digital 2~69ch
INPUT
Switch
ANALOG
DEMOD
USB2
USB3
USB3
HDMI4
LVDS
41P
51P
eMMC X 1
(4GB)
USB_WIFI
SYSTEM
DDR3
X
1600 X 16
(2Gb)
DDR
CONTROLER A/B
SPI
LOCAL DIMMING
I2C
Sub Micom
(RENESAS)
IR
Remote Control
SYSTEM
DDR3
X
1600 X
16
(2Gb)
SYSTEM
DDR3
X
1600 X 16
(2Gb)
UART
EPI
50P
50P
50P
X_TAL
27MHz
Cable
Analog 1~125ch
Analog 1~125ch
TDSH-T151F, T101F
* LVDS LS5700/LM6200 Series
* EPI Above LM6400 Series
5. Block diagram for Middle models(Backend)
IC7700
TPS65178
IC7701
TPS65198
50Pin
EPI LEFT
50Pin
EPI RIGHT
VCOM, GIP_RST
R(0옴)
OPT
DISCHG
VGL_I
VGL
_I
VGH_ODD, VGH_EVEN
VGH_R, VGH_F, VST
R
(0옴)
CLK1~6_I
CLK1~6
VC
OM
_P
/N
/L
O
O
P
VGL_FB
CTRLN
VCC
CTRLP
VGH_FB
VDD
SWP
SWN
Main
SoC
R
(47옴)
EO_SOC
MCLK_SOC
GST_SOC
GCLK_SOC
GCLK
MCLK
GST
EO
[TCON6]
[TCON5]
[TCON4]
[TCON3]
* EPI & T-con (LM6400 ~ LM7600 Series)
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