Page 1
LG
2017 4K LCD UHD Training
60UJ7700 WebOS
MAIN BOARD INFORMATION AND TROUBLESHOOTING
3.5
4K LCD TV
Main Circuit Board
Information and Troubleshooting
Note: Part numbers may change over time, please check GSFS for
correct part number before ordering.
Published: December 21st, 2018
Page 2
60UJ7700 Main Board Picture
MAIN BOARD
p/n: EBT64532903
AUSYLJR/BUSYLJR
P7600 51pin
To T-CON
60UJ7700 (2017) Main
HDMI 1
P1001 18pin
To SMPS
December (2018)
P5800 4pin
To Speakers
OPTICAL
LAN
USB 2
AV
P4000 25pin
To Joystick, PWR LED, IR and WiFi/M-Remote
Page 01
HDMI 3
HDMI 4
TUNER
HDMI 2
(ARC)
USB 1
LG
Page 3
60UJ7700 Main Board Component Layout
P1001 "MAIN Board" to "SMPS Board" P201
PIN LABEL RUN DiodeSTBY
(5)
1
V_SYNC
(5)
SIN
3
4
5
60V
Gnd Gnd Gnd Gnd
(5)
SCLK
(2)
MS (Drv_On)
(3)
P_DIM1
0V
0V 3.29V OL2
0V
0V
0.24V
0.14V
2.09V OL
*0.17V-3.28V
7-8 Gnd Gnd Gnd Gnd
9-12
15
13.2V
(1)
PWR_ON
(4)
P_DIM2
7.90V
0V
13.11V
3.36V
1.35V
P4000 "MAIN Board" to “IR/Joy Stick” / WiFi
PIN RUNLABEL DIODE
1 +3.5V 0V 1.67V
STBY
3.48V
0.04V2 WiFi_DM 0V 1.50V
0.04V3 WiFi_DP 0V 1.49V
Gnd4GndGnd Gnd
3.44V5 WOL_ON 3.48V OL
3.47V6 3.5V 3.48V 1.67V
3.48V7 Combo_Reset 3.48V 2.28V
8
GndGnd Gnd Gnd
0.01V9 Wakeup_Device 0V 2.26V
10
11
Gnd Gnd Gnd
12
0.01VWakeup_Host 0V 2.26V
Gnd
GndGnd Gnd Gnd
n/c13 N/C n/c n/c
14
15
N/C n/c n/c
N/C n/c n/c
16
n/c
n/c
3.48VEYE_SDA 3.48V OL
3.48V17 EYE_SCL 3.48V OL
18
GndGnd Gnd Gnd
3.46V19 IR 3.48V 2.27V
0.01V20 LED 2.73V OL
21
Gnd Gnd Gnd
22
Gnd
3.48V3.5V 3.48V 1.98V
3.48V23 KEY2 3.48V 2.30V
Gnd24 KEY1 Gnd Gnd
25
IR Signal: 3.76V p/p
Note IR Pin 19: When reading DC, if a Key is pressed on the
Remote, the voltage drops to (2.9V ~ 3.2V).
Key 2 Drops to 0.52V when Joystick button is pushed.
GndGnd Gnd Gnd
December 2018
OL
OL
OL
OL
OL
OL
(4)
SMPS
Fixed Voltage
(5)
For Local Dimming
PIN
17
*Dim 0% to Bright 100%
P_DIM: *1.79V 50%
18
15
16
13
14
11-12
7-10
513 Gnd Gnd Gnd Gnd
613.2V14 7.90V 13.11V OL
3
416 0V
1-217-18 Gnd Gnd Gnd Gnd
WiFi
1
2
3
4
5
6
7
8
IR/Joy
10
9
8
7
6
5
4
3
2
1
P1001 Connector
(Pin 14): A13.2V
For Audio.
(Pin 9-12): D13.2V
For All Others.
SW3001
P7600
To T-CON
Vx1_Lock_Drive
D
Q1001
G
P1001
Q5800
MUTE
Normal Hi
LD1000
Vx1_Lock
PWR_ON
Q1000
C
EB
C
E
B
To SMPS
P5800
R- R+ L- L+
To Speakers
All Speaker Pins 1.44V
Diode Check All Pins “0L”
Speakers are 6 ohm.
MAIN BOARD DIODE
CHECKS
(All Connectors Connected)
+13.2V (OL)
+3.5V_ST (0.62V)
+3.5V_WiFi (0.99V)
IR (1.38V)
Key2 (1.29V) with Power key
pressed (1.11V)
Micro_Reset
PWR_DET
S
2
IC1300
1
3
JK3403
LD1000 Lights when Vx1
Connected Correctly
JK5000
Optical
LAN
IC5800
Audio
Composite/Component
P4000
(1)
PWR-On Pin 15: Turns on 13.2V to the Main. No backlights at this time. Backlight Power is 105V.
(2)
MS (DRV_On) Pin 5: Turns on the Backlights. Backlight power goes to 138V.
(3)
P_DIM1 Pin 6: Will vary according to incoming video IRE level and OSD Backlight setting Output from the
Video Processor. And the Backlight settings in the Customer’s Menu 0% TO 100%. It is then routed out
P1001 to P201 and sent to the LED Driver IC on the Back of the SMPS.
The Range is: Dim 0.17V ~ Bright 3.28V. (1.76V at 50%). PDIM is actually a 3.44V p/p pulse (PWM Control).
Page 02
Vx1_Lock
60UJ7700 (2017) Main Board Section
Heat Sink
IC502
MAIN BOARD
Main Board
p/n: EBT64532903
AUSYLJR/BUSYLJR
JK3103
USB 2
JK4600
IC4700
+5V_USB3
JK3400
To Joy Stick / IR and WiFi / M-Remote
HDMI 3
JK3104
HDMI 4
IC501
+1.5V_DDR
L1501
IC402
IC401
Pin 19 IR: 3.48V p/p
IR Voltage: Drops to 3.01V
when IR Received.
Access
Tuner pins
From the
back side.
TU6700
TDJS-H301F
11
1
IC2100
+0.9V_CPU
IC2000
TU_CVSB
Q6502
E
C
B
IC4501
+5V_USB2
+3.3V_Normal
IC1400
+5V_Normal
IC1600
IC1800
+1.8V_IO
+0.9V_Core
HDMI 1
JK3101
HDMI 2
JK3102
JK4400
USB 1
LG
Page 4
60UJ7700 Main Board P1001 Voltages and Diode Checks
P1001 "MAIN Board" To P201 "SMPS Board"
Pin Label STBY Run Diode Check
1
(5)
V_SYNC 0V 0.02V OL
Note1: Pin 15 (PWR_ON) Power On: Turns on the 13.2V line.
Backlights are not on. BL PWR is 105V.
60UJ7700 (2017) Main
(5)
2
SIN 0V 0.07V OL
3 Gnd Gnd Gnd Gnd
(5)
4
5
6
SCLK 0V 0.14V OL
(2)
DRV-ON 0V 3.28V 1.82V
(3)
P-DIM 0V 0.28V~3.31V OL
7-8 Gnd Gnd Gnd Gnd
9-12 +D13.2V 3.56V 3.52V OL
13 Gnd Gnd Gnd Gnd
14 +A13.2V 3.56V 3.52V OL
15
16
(1)
PWR-ON 0V 3.3V OL
(4)
P-DIM2 0V 1.35V 2.04V
17-18 Gnd Gnd Gnd Gnd
Note2: Pin 5 MS (DRV_ON) Drive On: Is (INV_ON “Inverter On”)
from Main. This turns on the Backlights. Backlight Power is 138V.
Note3: Pin 6 (P_DIM1): Controls the backlight brightness. Controlled
by Customer’s Menu, Video, Backlights. Range 0% to 100% directly
proportional to DC voltage to Backlight brightness. P-DIM is actually
a PWM signal. (1.79V at 50%).
Note4: Pin 16 (P_DIM2): Is a Fixed Voltage.
Note5: Pins 1, 2 and 4: SCLK (Serial Clock P), V-SYNC (Video
Sync) and SIN (Serial Input Data) are used for Local
Dimming.
A13.2V for Audio (pin 14), D13.2V for All Others (pin 9-12)
December (2018)
Page 03
LG
Page 5
60UJ7700 Main Board P4000 Voltages and Diode Checks
60UJ7700 (2017) Main
P4000 "MAIN" To "IR/Joy Stick" - P1 and "WiFi"
Pin Label STBY Run Diode Check
1 +3.5V_WiFi 0V 3.48V 1.67V WiFi 1
2 WiFi_DM 0V 0.03V 1.50V WiFi 2
3 WiFi_DP 0V 0.03V 1.49V WiFi 3
4 Gnd Gnd Gnd Gnd WiFi 4
5 WOL/WiFi/Power/On 3.48V 3.44V OL WiFi 5
6 3.5V 3.48V 3.47V 1.67V WiFi 6
7 Combo_Reset 3.48V 3.48V 2.28V WiFi 7
8 Gnd Gnd Gnd Gnd WiFi 8
9 N/C n/c n/c n/c
10 N/C n/c n/c n/c
11 N/C n/c n/c n/c
12 N/C n/c n/c n/c
13 N/C n/c n/c n/c
14 N/C n/c n/c n/c
15 N/C n/c n/c n/c
16 EYE_SDA 3.48V 3.48V OL Ft IR 10
17 EYE_SCL 3.48V 3.48V OL Ft IR 9
18 Gnd Gnd Gnd Gnd Ft IR 8
19 IR 3.48V 3.46V 2.27V Ft IR 7
20 LED_R 2.73V 0V OL Ft IR 6
21 Gnd Gnd Gnd Gnd Ft IR 5
22 3.5V_ST 3.48V 3.48V 1.98V Ft IR 4
23 Key 2 3.48V 3.48V 2.30V Ft IR 3
24 Key 1 Gnd Gnd Gnd Ft IR 2
25 Gnd Gnd Gnd Gnd Ft IR 1
IR 3.76V p/p
* When General Mobile TV On (Turn on via WiFi)
is turned on, these voltages stay On in Stand-By.
IR Signal: 3.76V p/p
Note IR Pin 19: When reading DC, if a Key is
pressed on the Remote, the voltage drops:
(2.9V ~ 3.2V).
IR Drops to 2.90-3.20V when receiving IR Signal.
Key 2 Drops to 0.52V when Joystick button is
pushed.
December (2018)
Page 04
LG
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