Page 1
LG
M
y
2015 Direct View UHD Training
55UF7600 WebOS
2.0
UHD LCD TV
MAIN BOARD INFORMATION
ain Board Layout and
Voltage Measurements
Page 2
55UF7600 Main Board (Photo)
55UF7600 (2015) Main Board Section
September 2016
Page 01
LG
Page 3
55UF7600 Main Board Component Layout
P2300 "MAIN Board" to "SMPS Board" P201
LABELPIN STBY RUN Diode Check
23-24
18-22
GND GndGnd Gnd
24V OL0V 25.46V
16-17 GND GndGnd Gnd
11-15
9-10
7-8
6
5
4
3
2
1
12V OL0V 11.88V
GND GndGnd Gnd
3.5V 1.23V3.54V 3.52V
GND GndGnd Gnd
3.5V 1.23V
3.54V 3.52V
P-DIM2 0V OL0.92V
P-DIM
0.17V-2.55V
0V OL
DRV_ON 0V 3.46V 1.54V
PWR_ON 0V 3.51V OL
Dim to Bright
(1) PWR_ON: turns on the 12V and 24V lines.
Backlight power goes to 63.62V.
(2) INV_CTL: (DRV_ON on SMPS) turns on the
Backlights. Backlight power goes to 80V.
(3) P-DIM: controls the backlight brightness. Controlled
by Cust. Menu, Video, Backlights. Range 0% to
100% directly proportional to DC voltage to Backlight
brightness. P-DIM is actually a PWM signal.
(4) P-DIM2: Fixed Voltage.
KEY VOLAGES
P4100 "MAIN" to "Joy Stick J1, M-Remote/WiFi"
LABELPIN STBY RUN Diode Check
2
3.5V_WOL OL0V 3.49V
12 Key 1 1.98V3.55V 3.52V
14 Key 2 1.98V3.55V 3.52V
15 IR 1.89V3.54V 3.78V
16 3.5V_ST 1.25V3.56V 3.52V
Pin 2 is power for the M-Remote / WiFi Board
Pin 16 is power for the IR/Joy Stick Board
IR peak/peak 3.80V
September 2016
LD12900: Indicates VX1 Signal to
T-CON is good if LD12900 is illuminated.
If Off, possible causes:
Improper seated or defective Vx1 cable
or problem with signal processing.
LD12901 turned on by Q12900
Note: With top 3 screws left out of the
board, video looks double image like it's
in 3D.
Q402 M2_DDR_RESET_N
Q7100 I2C_SCL6 Buffer
Q7101 I2C_SDA6 Buffer
Q7102 HTPDAn Driver
Q7103 LOCKAn Driver
Q7104 HTPDAn Switch
Q7105 LOCKAn Switch
Q401 M1_DDR_RESET_N Select
WiFi pin 1
Joy Stick pin 2
Joy Stick pin 3
Joy Stick pin 7
Joy Stick pin 4
To the
T-CON
13.2V
Pins 48-51
IC2307 12V
PWR_Det
IC2300
+1.1V_VDDC_CPU
To
SMPS
Q2300
PWR_ON
X3000
(32.768KHz)
Q3001
CEC
SW3000
Micom Reset
All Speaker plug pins
(Min) 2.83V-3.20V (Max)
Diode Check (OL)
Page 02
LD12901
IC1901
SPI FLASH
DDR_VTT_URSA
P7100
IC2307
Panel_VCC
IC2309
IC2300
Q2321
P2300
3
X3000
IC3000
P3000
S
D
G
Q3001
SW3000
Q5800
B
E
C
+3.5V_WiFi
IC4100
P5800
Q12900
LD1900
EB
C
Q1901
DDR_VTT_1
IC2303
Q7101 FET
Q7100 FET
Q7102 Q7104
Q7103 Q7105
1
2
3
Q2301
+1.8V
1
Q2300
2
Micro
Mute
IC5800
Audio
B
C
E
IC2500
URSA9
IC2900
DDR
IC13100
Q402
+1.5V_DDR
IC600
IC602
D
Q2302
GS
IC402
In
Out
Adj
RS232
IC6801
JK3801
RS232
P4000
P4100
55UF7600 (2015) Main Board Section 08
X1900
(24MHz)
+1.5V_U_DDR
IC2800
DDR
IC13403
IC407
IC405 IC406
DDR
AVDD_3P3
Processor
DDR
DDR
Q2302 CPU_VID1 Select
Q401
C
DDR-VTT
E
B
IC401
IC2301
IC102
NVRAM
P101
IC6100
JK5000
LAN
JK3803
Head
Phone
MAIN BOARD
JK3802
To
Ft. Joy Stick /
IR
N/C
DDR
P1905
IC2600
DDR
IC2700
M13507
DDR
IC201
+3.5V_WOL
IC100
Q400
B
E
C
IC400
Head Phone Amp
Optical
JK3800
Heatsink Clip
IC13408
+1.1V_U_VDDC
CORE_VIDO Selector
D
Q2500
S
G
IC2501
CORE_VID1 Selector
D
Q2501
S
G
+1.1V_VDDC
Heatsink
Clip
+5V_Normal
+3.3V_Normal
3
1
2
IC200
X600
(24MHz)
USB_+5V
IC2305
IC2302
IC4300
+5V_USB_3
Q400 M0_DDR_RESET_N Select
IC8100
MEMC
/FRC
Main Board
p/n: EBT63818912 AUSYLJR
p/n: EAJ63109901 BUSYMJR
p/n: EAY63729101 BUSYLJR
p/n: EBT63990602 AUSYMJR
p/n: EBT63990603 AUSYMJR
TU_CVBS
TU6705
TDJH-H301F
Access Tuner
TUNER
pins from the
TU6401
back
side
Q6502
B
9
1
Q3300
C
E
Hot
Swap
JK4300
USB3 USB2 USB1
JK4302
JK4500
HDMI3 HDMI2 HDMI1
JK3203
JK3200
JK3202
B
C
E
TUNER PINS
9. CVBS
8. SIF
7. DIF (N)
6. DIF (P)
5. SDA_RF
4. SCL_RF
3. DIF AGC
2. N/C
1. +3.3V_LNA_TU
LG
Page 4
55UF7600 Main Board Crystals Measurements
X1900
(24MHz)
X1900 Top Right Leg P/P
24Mhz 1.42VDC
1.35VDC
Bottom Left Leg
2.92V p/p
3.6V p/p
55UF7600 (2015) Main Board Section
Top Right
2.92V / 25nSec
Bottom Left
3.6V / 25nSec
X600 Top Left Leg
24Mhz 1.68VDC 3.72V p/p
X3000
X3000 Right Leg
0.68VDC
Left Leg
24Mhz 0.15VDC 856mV p/p
P/P
1.08mV p/p
X600
(24MHz)
1.70VDC
Bottom Right Leg
P/P
3.04V p/p
Top Left
3.04V / 10nSec
Bottom Right
3.72V / 10nSec
Right Leg
1.08V / 10uSec
Left Leg
856mV / 10uSec
Page 03September 2016
LG
Page 5
55UF7600 Main Board (Small) Component Voltages
Pin Memory Pin Regulator Pin Regulator Pin LD1900 Pin Driver
[1] Gnd [1] Gnd [1] 3. 49V (Out) [E] 0.67V [B] 0V
[2] Gnd [2] 11. 85V (Vcc In) [2] Gnd [B] 0.52V [C] 3.29V
[3] Gnd [3] Gnd [3] 0.43V (n/c) [C] Gnd [E] Gnd
[4] Gnd [4] 0.80V (FB) [4] 3.51V (En)
[5] 3. 30V [5] 1. 36V (Comp) [5] 3. 51V (Vcc In) Q2300 PWR_On Q6502 TU_CVBS
[6] 3. 30V [ 6] 3.47V (Enable) Pin Switch Pin Buffer
[7] Gnd [7] 1. 07V (Out) IC4300 +5V_USB_1 [1] 3.50V [B] 1.52V
[8] 3. 30V [8] 1. 07V (Out) Pin Regulator [2] 2.84V [C] Gnd
IC200 +3.5V_WOL IC2301 +1.8V_DDR [2] Gnd
Pin Regulator Pin Regulator [3] 3.28V (Enable) Q2301 CPU_VID0 Q7100 I2C_SCL6
[1] 3.49V (Out) [In] 3.29V (In) [4] 3.30V (USB_OCD3) Pin Select Pin Switch
[2] Gnd [Out] 1.79V (Out) [5] 0.40V [G] 0.31V [G] 3.05V
[3] 0. 17V n/c [Adj] 0.54V [6] 5. 11V (Out) [S] Gnd [S] 3.27V
[4] 3. 51V (WOL_CTL) [D] 0.07V [D] 3.26V
[5] 3.50V (Vcc In) IC2302 (+3.3V_NORM AL) IC13100 DDR_VTT_URSA
IC201 AVDD_3P 3 [1] Gnd [1] 1. 52V (In) Pin Select Pin Switch
Pin Regulator [2] 11.82V (Vcc In) [2] Gnd [G] 3. 29V [G] 3.05V
[1] Gnd [3] Gnd [3] 0.76V [S] Gnd [S] 3.27V
[2] 3. 31V (Out) [4] 0.70V (FB) [4] 0.76V (Out) [D] 0. 07V [D] 3.26V
[3] 3. 50V (In) [5] 1. 97V (Comp) [5] n/ c
IC402 DDR_VTT [7] 3.31V (Out) [7] n/c Pin IC2309 Pin Driver
Pin Switch [8] 3.31V (Out) [8] n/c [B] 0.66V [G] 0.18V
[1] 1. 51V (in) [E] Gnd [S] 0.0V
[2] Gnd IC2303 +1.5V_DDR IC13403 (+1. 5V_U_DDR) [C] 0. 60V [D] 1.96V
[3] 0.76V Pin Regulator Pin Regulator
[4] 0. 76V (out) [1] 3. 40V (Enable) [1] 3.49V (Enable) Q2500 CORE_VIDO Q7103 LOCKAn
[5] n/c [2] 0.76V [2] 0.77V Pin Select Pin Driver
[6] 3. 29V (Enable) [3] 5. 23V [ 3] 5.23V [G] 3.31V [G] 0.18V
[7] n/c [4] 2.49V [4] 2.51V [S] Gnd [S] 0.0V
[8] n/c [5] Gnd [5] Gnd [D] 0.07V [D] 1.97V
IC407 DDR_VTT_1 [7] 6.60V [7] 6. 47V Q2501 CORE_VID1 Q7104 HTPDAn
Pin Switch [8] 11.84V (V cc In) [8] 11.84V (I n) Pin S elect Pin Switch
[1] 1. 52V (in) [G] 3.31V [G] 0.63V
[2] Gnd IC2307 PWR_Det Q400 M 0_DDR_RESET_N [S] Gnd [S] 0.0V
[3] 0. 76V Pin 12V Sense Pin Select [D] 0.07V [D] 0.04V
[4] 0. 76V (out) [1] Gnd [E] Gnd
[5] n/ c [2] 3.61V (Out) [B] 0.0V Q3001 CEC Q7105 LOCKAn
[6] 3. 29V (Enable) [3] 3. 64V (In) [C] Do Not Measure Pin Bi-Directional Pin Switch
[7] n/c [G] 3.51V [G] 0.0V
[8] n/c Q2309 Panel_VCC Q401 M1_DDR_RESET_N [S] 3.48V [S] 0.64V
IC1901 SPI FLASH [1] 11.85V (Vcc In) [E] Gnd
Pin Memory [2] 11.85V (Vcc In) [B] 0.64V Q3300 HDMI Q12900 Drives
[1] 3. 29V (CS) [3] 11. 85V (Vcc In) [C] 0.07V Pin Hot Swap Pin LD12901
[2] 3.28V (SO) [4] 1.86V (CTL) [B] 0V [E] 0.63V
[3] 0V (WP) [5] 11. 84V (Out) Q402 M2_DDR_RESET_N [E] Gnd [B] 0.02V
[4] Gnd [6] 11. 84V (Out) Pin Select [C] 0.63V [C] Gnd
[5] 3. 29V (SPI_DI) [7] 11.84V (Out) [E] Gnd
[6] 0V (SPI_CK) [8] 11.84V (Out) [B] 0.0V
[7] 3. 29V (Hold) [C] 1.56V
[8] 3.29V (In)
Pin Regulator Pin Regulator Q2302 CPU_VID1 Q7101 I2C_SDA6
[6] 3. 47V (Enable) [6] 3. 29V (Enable) Q2321 Driver for Q7102 HTPDAn
[6] 1. 57V (Out) [6] 1.53V (Out)
Pin Switch Pin Select [D] 3.43V [D] 0.05V
[1] 5. 11V (In) [3] 3. 49V [E] 2. 23V
55UF7600 (2015) Main Board Section
September 2016
Page 04
Page 6
55UF7600 Main Board (Large) Component Voltages
[2]
0.43V (Freq)
[10]
Gnd
[21]
3.06V
[45]
0V
IC2305 IC3000 IC5800
+5V_NORMAL / +5V_USB Micro Audio
Regulator Pin Processor Pin Pin Amp Pin
Pin Pin
[1] 25.35V (In) [15] 3.43V (OCP2)
[2] 25.35V (In) [16] 5.11V
[3] 25.35V (In) [17] 5.11V
[4] Gnd [18] 11.53V
[5] Gnd [19] 5.11V (Out)
[6] Gnd [20] 5.11V (Out)
[7] 6.30V [21] 5.11V (Out)
[8] 6.30V [22] 1.94V
[9] 3.51V (Enable) [23] 0.60V
[10] 5.10V (Out USB2) [24] 0.35V
[11] 5.10V (Out USB3) [25] 1.24V
[12] 3.28V (USB2 Ctrl) [26] 0.45V
[13] 3.28V (USB3 Ctrl) [27] 0.45V
[14] 3.43V (OCP2) [28] Gnd
IC2501 [17] 3.51V [41] 0.65V [17] Gnd [38] 1.61V
+1.1V_VDDC [18] 3.51V [42] 0.13V [18] 2.16V (Out R-) [39] Gnd
Pin Regulator [19] 3.29V [43] 0V [19-20] 18.67V (R B+) [40] 3.31V (In)
[1] 3.51V (EN) [9] 11.83V (In) [20] 3.09V [44] 0.14V
[1] 3.23V [25] 0V [1] n/c [21] 2.16V (Out R+)
[2] 3.23V [26] 3.51V [2] 1.24V [22] Gnd
[3] 2.69V [27] 3.51V [3] n/c [23] 4.71V
[4] 2.09V [28] 0.03V [4] Gnd [24] 5.12V
[5] 3.46V [29] 0.1V [5] n/c [25] 5.14V
[6] 3.5V [30] 0V [6] 1.26V [26] n/c
[7] 3.49V [31] 3.34V [7] 0V [27] 5.11V
[8] 3.51V [32] 3.51V [8] 1.62V [28] 4.72V
[9] 0V [33] 3.51V [9] n/c [29] Gnd
[10] 3.51V [34] 3.75V [10] 2.62V [30] 2.16V (Out L-)
[11] 3.51V [35] 0V [11] 2.43V [31-32] 18.67V (L B+)
[12] 0V [36] 0V [12] 3.30V (Mute) [33] 2.16V (Out L+)
[13] 3.51V [37] 0.02V [13] n/c [34] Gnd
[14] 3.72V [38] 0V [14] 0.0V [35] 4.71V
[15] 3.53V [39] 3.51V [15] n/c [36] 3.03V (Reset)
[16] 0V [40] 3.51V [16] 4.71V [37] Gnd
55UF7600 (2015) Main Board Section
September 2016
[3] 0.63V (FB) [11] Gnd [22] 0V [46] 2.09V IC13408
[4] 4.84V (SS) [12] Gnd [23] 0V [47] Gnd +1.1V_U_VDDC
[5] Gnd [13] Gnd [24] 0.1V [48] 3.51V Pin Regulator
[6] 4.83V (PG) [14] 11.83V (In) [1] 3.51V (EN) [9] 11.83V (12V In)
[7] 4.87V (VCC) [15]
[8] 5.79V (BST) [16]
IC6100 [1] 3.52V [9] n/c [5] Gnd [13] Gnd
Head Phone [2] 5.39V [10] n/c [6] 4.83V (PG) [14] 11.83V (12V In)
Pin Amp Pin [3] 0V [11] 3.09V [7] 4.87V (VCC) [15]
[1] Gnd [8] 1.66V [4] 0.02V [12] 3.52V [8] 5.95V (BST) [16]
[2] 0V (R In) [9] 3.31V (3.3V_Normal In) [5] (-5.33V) [13] 0V
[3] 0V (R Out) [10] Gnd [6] (-5.34V) [14] (-5.24V)
[4] Gnd [11] n/c [7] n/c [15] Gnd
[5] 3.49V (Mute) [12] 0V (L Out) [8] n/c [16] 3.52V (3.5V_ST In)
[6] (-3.18V) [13] 0V (L In)
[7] (-1.59V) [14] Gnd
1.02V (Out)
1.02V (Out)
Pin Data [4] 4.84V (SS) [12] Gnd
IC6801 [2] 0.43V (Freq) [10] Gnd
RS232 [3] 0.63V (FB) [11] Gnd
1.18V (Out)
1.18V (Out)
Page 05
Page 7
LG
y
2015 Direct View UHD Training
55UF7600 WebOS
2.0
UHD LCD TV
POWER SUPPLY BOARD INFORMATION
SMPS Board Layout and
Voltage Measurements
Page 8
55UF7600 Power Supply Board Component Layout
P801 Black "SMPS Board" to the "Backlights"
LABELPIN RUN
VC_6
1
2
3
4
5
6
7
8
P802 White "SMPS Board" to the "Backlights"
1
2
3
4
5
6 OLVC_3 7.37V-27.16V
7
7.30V-26.72V
7.36V-26.77V
VC_4
N.C.
N.C.
N.C
N.C.
79.5V-79.9V
LED+
Bright (100%) to *Dim (0%)
LABELPIN RUN Diode
79.5V-79.9V
LED+
N.C.
N.C.
N.C
N.C.
VC_1
7.60V-27.03V8
Bright (100%) to *Dim (0%)
n/c
n/c
n/c
n/c
n/c
Diode
OL
OLVC_5 7.20V-26.93V
OL
n/c
n/c
n/c
n/cn/c
OL
OL
n/c
n/c
n/cn/c
n/cn/c
OLVC_2 7.22V-26.94V
OL
EL85
EL84
EL86
P202
P202
EL90
EL87
EL91
See Backlight Section concerning
“Testing a Backlight Block VC_1-VC_6”
to confirm if the problems is the SMPS
or the Panel.
IC102
6.56V
31V
Hot Gnd
0.89V
Chassis
7.60V
+25.36V
D254D253
Stby: 354V
Run: 393V
82uF/460V
392V
104V
MODEL
OUTPUT
F101
82uF/460V
D601
D602
D603
Q102 Q103
3.15A / 250V
L601
3.5V = 1.7A
12V = 3.5A
24V = 1.2A
Note: Sometimes LD701 blinks during
normal start-up (7 times). Local
Dimming Error Code.
SMPS BOARD
p/n: EAY63729101
T102T101
P100
n/c
105.2V
HGnd
VOLTAGE LABEL
LGP4955-15UL6
AC 100V~240V~50/60Hz. 2.8AINPUT
63.3V = 1.08A (49)
72.6V = 1.08A (55)
Backlights
P801 P802
Gnd LED+
D261
D252
D251
D252
D255
D256
IC102
BD101
55UF7600 (2015) Power Supply Section
P201 "SMPS Board" to P2300 "MAIN Board"
LABELPIN STBY RUN
28
To
EL85
EL87
EL91
EL86
EL84
P202P203
100uF/
120V
EL90
P702
+79.8V
+48.75V
LD701
See Note 2
Normal: Off
n/c
+49.02V
+48.98V
100uF/
100V
C251
C271
+11.96V
+11.96V
L202
100uF/
100V
P201
Main/T-CON
To
*V_SYNC 0V 0.02V OL
27
*SIN 0V 0.05V OL
26
*Gnd
25
*SCLK 0V 0.04V OL
Gnd23-24
Gnd Gnd Gnd
Gnd Gnd Gnd
24V18-22 0V 25.46V 1.11V
16-17
11-15
Gnd
12V
9-10 Gnd
7-8
3.5V33.54V 3.52V 1.74V
6
Gnd Gnd Gnd Gnd
5
3.5V 1.74V
(4)
P-DIM2 0V
(3)
P-DIM40V OL
Gnd Gnd Gnd
0V 11.88V 0.34V
Gnd Gnd Gnd
3.54V 3.52V
0.17V~2.55V
0.92V
DRV_ON2 0V 3.46V OL
VA101
L
E
L201
F100
5A /
250V
PWR_ON1 0V 3.51V OL
(3)
Dim to Bright
Note: Main board only has 24 pins.
(Top 4 are for local dimming from the T-CON).
PWR_ON Pin 1: Turns on 12V and 24V
(Also see Note 1)
DRV_ON Pin 2: Turns on Backlights.
(Also see Note 2) DRV_ON is
INV_CTL from Main.
P-DIM Pin 3: Controls Backlights via customer’s menu
Backlights 0% to 100%.
P-DIM2 Pin 4: Fixed Voltage.
Note 1: Backlight power is 63.62V with PWR_ON arrives, (no
backlights)
Secondary
Primary
LF101LF102
N
SK100
AC
This Screw is a
different size
M4 * L9 w/washer
Note 2: Backlight Power goes to 80V when DRV_ON arrives,
Backlights On).
LD701 normal state is Off. If it is blinking, it indicates a
problem. Missing DRV_ON, LED feedback error, Controller
Error, etc….
Example: If either P801 or P802 is disconnected, backlights
come on, but only ½ the screen is lit, then LD701 blinks 3
times every 5 seconds. If DRV_ON is missing,
LD701 (after 1 minute), blinks 5 times every 5 seconds.
(4)
Diode
OL
Fixed
September 2016
Page 01
LG
Page 9
s
o
55UF7600 Power Supply Board Voltage Information
P201 "SMPS Board" Stand-Alone
Pin Label Test 1 Test 2
28 *Vsync
27 *SCLK
26 *Gnd
25 *SCLK
23-24 Gnd
18-22 24V
16-17 Gnd
11-15 12V
9-10 Gnd
7-8 3.5V
6Gnd
53.5V
4
3
2
1
(3)
P-DIM2
(3)
P-DIM
(2)
DRV-ON
(1)
PWR-ON
n/a n/a
n/a n/a
n/a n/a
n/a n/a
Gnd Gnd
24.50V 24.65V
Gnd Gnd
12.07V 12.04V
Gnd Gnd
3.54V 3.53V
Gnd Gnd
3.54V 3.53V
3.52V 3.50V
3.52V 3.50V
0V 3.53V
3.54V 3.53V
BL Off BL On
If P801 is disconnected, the backlight power will start at 37.7V,
then jump to 47.97V and then fall back to 47.87V. Warning:
Backlight power is slow to bleed down after power off, connected
or disconnected.
If P801 is disconnected, Front Right half LEDs stay on.
If P802 is disconnected, Front Left half LEDs stay on.
If P801 or P802 is unplugged, LD701 blinks at a rate of 3 times
every 5 seconds.
LED Pow e r during TEST 1. 63.62V
Test 1 LED Ground Return Line 12.35V
LED Power during TEST 2. 76.2V
Test 2 LED Ground Return Line 1.17V
SMPS Controller IC is IC101
Backlight Driver IC is IC801
Backlight Controller IC is IC701
D251 3.5V_ST Source (ba ck of the boa rd)
D252 D261 24V Source
D253 D254 D255 12V Source
D259 D263 Ba ckl ight P ow e r Sou rce
P201 "SMPS Board" With Smart Jig
Pin Label W/Jig
28 *Vsync
27 *SCLK
26 *Gnd
25 *SCLK
23-24 Gnd
18-22 24V
16-17 Gnd
11-15 12V
9-10 Gnd
7-8 3.5V
6Gnd
53.5V
4
3
2
1
(3)
P-DIM2
(3)
P-DIM
(2)
DRV-ON
(1)
PWR-ON
n/c
n/c
n/c
n/c
Gnd
24.72V
Gnd
12.04V
Gnd
3.51V
Gnd
3.51V
n/c
n/c
3.28V
3.51V
BL On
55UF7600 (2015) Power Supply Section
After 1 minute LD701 Red LED Blinks 5 times every 5 sec ond
Average: Backlights are not on
LD701 does not blink
Average: Each varies due to brightness uniformi ty software
(1) PWR_ON turns on the 12V and 24V lines. Backlight power
approx. 63.62V.
(2) DRV_ON (INV_ON from Main) turns on the Backlights.
Backlight power goes to approx. 80V.
(3) P_DIM controls the backlight brightness. Controlled via the
Customer’s Menu: Home
Range 0% to 100% directly proportional to DC voltage to Backlight
brightness. (0.17V~2.55V)
P_DIM is actually a 4V p/p PWM signal.
(4) P_DIM2 fixed voltage.
LED Power during Jig Test 75.7V
Test 2 LED Ground Return Line 0.97V-1.45V
SMPS Controller IC is IC100
Backlight Driver IC is IC801
Backlight Controller IC is IC701
D203 3.5V_ST S ource
D251 D252 24V So urce
D255 D256 D255 12V So urce
D210 (D251) Backl ight Pow e r Source
Additional Details:
11.18V Average voltage swing for a block of LEDs. V1-V6
1.17V Average Feedback Voltage (High Bright)
12.35V Average Feedback Voltage (Dim)
79.5V Backlight power 100% Backlights
79.9V Backlight power 0% Backlights
42.29V Total Voltage Drop (Bright, Vivid)
144 Total LEDs 6 Blocks
24 LEDs per-Block 3.26V per-diode Voltage drop
P_DIM (1.58V (50%) Backlight Power 79.7V. Backlight Drive
16.16V.
Note: Sometimes LD701 blinks during normal start-up (7 times).
Local Dimming Error Code.
Settings Picture Backlights.
LD701 does not blink
Each varies due to brightness unif
September 2016
Page 02
LG
Page 10
LG
T
y
2015 Direct View UHD Training
55UF7600 WebOS
2.0
UHD LCD TV
T-CON BOARD INFORMATION
-CON Board Layout and
Voltage Measurements
Page 11
55UF7600 T-CON Board (Photo)
55UF7600 (2015) T-CON Board Section
September 2016
Page 01
LG
Page 12
55UF7600 T-CON (TFT Drive) Components Identified
Caution: Make sure the screws are installed when the T-CON is operating, damage may occur without them.
55UF7600 (2015) T-CON Section
Note: To run the Panel Test (Testing the T-CON without the
Main board), simply unplug CN1. Jump 12V to the fuse F1.
Apply power to the set. (Backlights and Power Supply should be
working OK). T-CON outputs color patterns on the screen. This
test confirms the T-CON, Power Supply, Panel and Backlights
are working normally. (Note: If backlights are not working, apply
12V to fuse and use a flashlight behind the panel to look for
pattern changes).
(8.09V)
(8.09V)
HVDD
(11.76V)
VIN
L1
Warning: Do not use
the Smart Jig on this
T-CON. Damage will
occur.
FL3
L6
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
C502
C501
C503
C500
VCOM1
VCOM2
VST
VGH_EVEN
VGT_ODD
* Toggles Every Second
8.91V
CLK1
8.96V
CLK2
8.96V
CLK3
8.96V
CLK4
8.91V
CLK5
8.91V
CLK6
8.91V
CLK7
8.91V
CLK8
Q2
Gnd
0.61V
-0.27V
-4.98V
4.70V
4.71V
16.64V
16.64V
8.09V
1.80V
5.94V
6.14V
-4.91V
-4.96V to 28V*
-4.96V to 28V*
VDD
VDD
HVDD
VCC18
32.8V - 33.0V p/p
CLK8
CLK7
CLK4
CLK6
CLK3
CLK5
(16.61V)
L3
(16.63V)
CLK2
CLK1
D3
VGH
(28.05V)
C500
CN2 CN3
CN2 Key Voltages CN3 Key Voltages
Vcore
CLK1 – CLK8
All have similar
waveforms
CN2 Video: Pins 14, 15 / 17, 18 / 20, 21 / 23, 24 / 26, 27 / 29, 30
VCC18
HVDD
VDD
VGL1
VGH_EVEN
VGH_ODD
VGH
29
U2
42
43 56
C501
C503
Pin 33
Pin 34, 35
Pin 36
Pin 37-40
Pin 45
Pin 49
Pin 50
Pin 51
1528
14
1
GCLK
C502
D1
MCLK
GST
VCOM1
VCOM2
VST
VGH_EVEN
VGH_ODD
EQ
TO MAIN
Warning Do Not Use Jig
Gnd
(3.30V)
VCC
45
Q2
VGL1
(-4.97V)
88
89 132
GCLK
3.56V p/p
LVDS
CN1
UC1
MCLK
3.60V p/p
EQ
No Waveform
CN1
CN5 “T-CON” to P201 "SMPS"
Gnd
F1
5A/125V
144
176
VIN: (PANEL_VCC 12V)
Pins 1-2 (Gnd)
Pins 3-5 (11.97V)
From Main
Panel_VCC Supply
(11.76V)
VIN
(11.76V)
VIN
L4
(1.20V)
Vcore
(11.76V)
1
2
3
4
(16.66V)
D4
U1
(1.80V)
VCC18
(1.81V)
U4
C512
C511
5 10152025303540455055605 1015202530354045505560
RS1
133
10Mhz
RS1
1.63Vdc
3.72V p/p
Top Legs
1.56Vdc
3.58V p/p
Bottom Legs
VCOMRFB
Vcore
GST
3.24V p/p
VCC18
HVDD
VDD
VGL1
VGH_EVEN
VGH_ODD
VGH
CN3 Video: Pins 31, 32 / 34, 35 / 37, 38 / 40, 41 / 43, 44 / 46, 47
7
12
13 18
C510
C513
16
24
19
U3
V1 V9 V14
Pin 28
Pin 26, 27
Pin 25
Pin 21-24
Pin 16
Pin 12
Pin 11
Pin 10
Q3
VDD
Source
(16.65V)
VDD
V5 V10 V18
LABELPIN RUN Diode Check
V_SYNC 0.03V 0.76V
Gnd
SCLK 0.06V
Gnd Gnd
SIN 0.08V
Local Dimming
to SMPS
CN5
FL2
U1
Pin 1
Pin 2
Pin 3
Pin 4
Pin 5
Pin 6
Pin 7
Pin 8
16.64V
C511
16.64V
C512
8.09V
C513
1.80V
C510
15.79V
V1
12.12V
V5
8.39V
V9
7.78V
V10
3.90V
V14
0.38V
V18
VCOMRFB 5.90V
Pin 1
Pin 2
Pin 3
Pin 1
Pin 2
Pin 3
0.76V
0.86V
Gnd
Gnd
Gnd
Gnd
3.27V
3.26V
3.29V
3.30V
VDD
VDD
HVDD
VCC18
Q3
8.99V
16.65V
16.66V
U4
Gnd
1.81V
3.30V
January 2016
Page 02
LG
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