LG 34UC88 User manual

Internal Use Only
P/NO :
CHASSIS :
MODEL :
CAUTION
BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
SERVICE MANUAL
MFL68920174 (1601-REV01)
LM55E
34UC88 34UC88-BF
34CB88 34CB88-PF
LED MONITOR

- 2 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
CONTENTS .............................................................................................. 2
SAFETY PRECAUTIONS ........................................................................ 3
SPECIFICATION ....................................................................................... 4
ADJUSTMENT INSTRUCTION ............................................................... 7
TROUBLE SHOOTING GUIDE .............................................................. 11
BLOCK DIAGRAM ................................................................................. 15
EXPLODED VIEW .................................................................................. 16
CONTENTS

- 3 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in
Exploded View.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 MΩand 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
IMPORTANT SAFETY NOTICE
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
SAFETY PRECAUTIONS

- 4 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
SPECIFICATION
NOTE : Specications and others are subject to change without notice for improvement.
1. General Specication
No. Item Specication Remarks
1Supported Sync. Type Separate Sync., Digital
2 Operating Frequency
HDMI Horizontal 30 ~ 90kHz
Vertical 56 ~ 61 Hz Native : 30 ~ 60 Hz
DP/TBT Horizontal 30 ~ 90kHz
Vertical 56 ~ 61 Hz Native : 30 ~ 60 Hz
DP
(FreeSync)
Horizontal 90 Hz
Vertical 55 ~ 75 Hz
3 Resolution
HDMI Max 3440×1440 @ 60 Hz
Recommend 3440×1440 @ 60 Hz
DP/TBT Max 3440×1440 @ 60 Hz
Recommend 3440×1440 @ 60 Hz
4 Input Voltage Input Voltage Voltage :100 - 240 Vac, 50 or 60 Hz, 1.5 A
2. Engineering Specication
No Item Content Remark
1 Customer BRAND
2 User Model Name 34UC88
3 Sale region World Wide
4 Feature 34 Inch Wide Curved LCD MONITOR(WQHD)
5 Chassis Name LM55E
6 General Scope External SW &Adj. 5-way joystick switch
Function PBP, Picture Mode Ratio, Gamma Calibration, SES, Six
Color, 7W speaker x 2, DisplayPort, HDMI x 2, Screen
split, USB hub(USB3.0 x 2)
7 Input HDMI1/2 IN HDMI 1 and HDMI 2
DP IN Display Port
Thunderbolt N/A
USB UP USB upstream(only with Host PC)
USB 1/2 USB downstream(only with Host PC)
Quick Charge(USB 1 only)
H/P Audio L/R
8 Power Code Length : 1.55 ± 0.05 M, Shape : Wall-out, Color : Black
Weight : 0.17 kg
Refer to Sufx standard
and power cord table
9 Cable TBT
(Thunderbolt)
Length : ,Shape : ,Color: ,Pin N/A
USB Length : ,Shape : ,Color: ,Pin N/A
Displayport Length : 1.8 ± 0.05 M
Shape : Detachable Type
Color : Black
Weight : 0.10kg±10%,
EAD63127603
HDMI Length : 1.8±0.05 M
Shape : Detachable Type
Color : Black
Weight : 0.09kg±10%,
EAD00926103
10 Power Input: AC 100 - 240 V 50 - 60Hz, 1.5A Max
Output: DC 19V 5.79A, 110W Adapter
Color : Black
Weight : 0.438kg±10%, without vinyl bag
EAY63032202

- 5 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
3. Signal Timing (Resolution)
3.1. Signal (Video & Sync)
3.2. H/V Timing
No. Section Pol. Dot Clock
[MHz]
Frequen-
cy
[kHz]/[Hz]
Total
Cycle
(E)
Dis-
play
(A)
Front
Porch(B)
Sync.
(D)
Back
Porch(F)
Resolution Input
source
1 H(Pixels) - 25.175 31.469 800 640 16 96 48 640 x 480 HDMI
V(Lines) - 59.94 525 480 10 2 33 DP
2 H(Pixels) + 40 37.879 1056 800 40 128 88 800 x 600 HDMI
V(Lines) + 60.317 628 600 1 4 23 DP
3 H(Pixels) - 65 48.363 1344 1024 24 136 160 1024 x 768 HDMI
V(Lines) - 60 806 768 3 6 29 DP
4 H(Pixels) + 79.99 54.347 1472 1152 32 96 192 1152 x 864 HDMI
V(Lines) + 60.05 905 864 1 3 37 DP
5 H(Pixels) + 74.25 45 1650 1280 110 40 220 1280x720 HDMI
V(Lines) + 60 750 720 5 5 20 DP
6 H(Pixels) + 108 63.981 1688 1280 48 112 248 1280x1024 HDMI
V(Lines) + 60.02 1066 1024 1 3 38 DP
7 H(Pixels) + 108 60 1800 1600 24 80 96 1600 x 900 HDMI
V(Lines) + 60 1000 900 1 3 96 DP
8 H(Pixels) - 146.25 65.29 2240 1680 104 176 280 1680x1050 HDMI
V(Lines) + 59.954 1089 1050 3 6 30 DP
9 H(Pixels) + 148.5 67.5 2200 1920 88 44 148 1920x1080 HDMI
V(Lines) - 60 1125 1080 4 5 36 DP
10 H(Pixels) - 185.58 66.7 2784 2560 64 64 96 2560x1080 HDMI
V(Lines) + 60 1111 1080 3 10 18 DP
11 H(Pixels) + 157.75 43.82 3600 3440 48 32 80 3440x1440 HDMI
V(Lines) + 29.99 1461 1440 3 10 8 DP
12 H(Pixels) + 265.25 73.68 3600 3440 48 32 80 3440x1440 HDMI
V(Lines) + 49.99 1474 1440 3 10 21 DP
13 H(Pixels) + 319.75 88.82 3600 3440 48 32 80 3440x1440 HDMI
V(Lines) + 59.97 1481 1440 3 10 28 DP

- 6 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
No. Factory support mode Horizontal frequency Horizontal frequency
(Preset Mode) (KHz) (Hz)
1 640x480P 31.47 60
2 720x480P 31.47 60
3 1280x720P 45 60
4 1920x1080P 67.5 60
5 1280x720P 37.5 50
6 1920x1080P 56.25 50
7 2560x1080P 56.25 60
8 2560x1080P 66 50
9 720x576P 31.25 50
3.3. HDMI Video input

- 7 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
ADJUSTMENT INSTRUCTION
1. Application Range
This document is applied to LM55E chassis Monitor which is
manufactured in Monitor Factory or is produced on the basis
of this data.
2. Designation
(1) The adjustment is according to the order which is desig-
nated and which must be followed, according to the plan
which can be changed only on agreeing.
(2) Power Adjustment: Free Voltage
(3) Magnetic Field Condition: Nil.
(4) Input signal Unit: Product Specication Standard
(5) Reserve after operation: Above 5 Minutes (Heat Run)
Temperature : at 25 °C ± 5 °C
Relative humidity : 65 % ± 10 %
Input voltage : 100 V~ 240 V, 50/60Hz
(6) Adjustment equipments: Color Analyzer (CA-210 or CA-
110), DDC Adjustment Jig equipment,
3. Main PCB check process
*
APC - After Manual-Insert, executing APC
3.1. ADC Process
N/A
3.2. EDID Process
3.2.1. EDID Download
F/W includes default EDID for All input ports, aging on Mode If
AC ON, default EDID is automatically loaded to EEPROM.
Update serial number in EDID of HDMI1.
→Caution : Never connect HDMI Cable when execute
NVRAM Init and AC On at rst for downloading
HDMI EDID automatically.
** Protocol : DDC 2AB
- EDID Ver. 1.3 FOR HDMI 1 (256Byte)
- EDID Ver. 1.3 FOR HDMI 1 (256Byte)_PBP Mode
- EDID Ver. 1.3 FOR HDMI 2 (256Byte)
- EDID Ver. 1.3 FOR HDMI 2 (256Byte)_ PBP Mode
No Item Content 16 Data
1 Manufacturer ID GSM 1E 6D
2 Product ID HDMI : 30454
Display Port (10bit /
Free-sync) : 30436
Display Port (8bit) :
30266
E6 76
E4 76
E2 5A
E3 5A
E5 76
3 Year 2015 19
4 Version 1 1
5 Revision HDMI : 3
DP : 4
HDMI : 3
DP : 4
6 Serial Number * *
7Week / Year ** **
8 Model Name LG ULTRAWIDE -
9 Check Sum *** ***
10 Color Depth
(0x14h)
8bit / 10bit A5 / B5
* * * *
* * * * * * * * * *
* * * * * * * * * *
** **
***
***
* * * *
* * * * * * * * * *
* * * * * * * * * *
** **
***
***
* * * *
* * * * * * * * * *
* * * * * * * * * *
** **
***
***
* * * *
* * * * * * * * * *
* * * * * * * * * *
** **
***
***

- 8 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
- EDID Ver. 1.4 FOR Display Port_8bit (256Byte)
- EDID Ver. 1.4 FOR Display Port (256Byte) _ PBP Mode
- EDID Ver. 1.4 FOR Display Port_10bit (256Byte)
- EDID Ver. 1.4 FOR Display Port_Free-sync (256Byte)
3.3. Function Check
3.3.1. Check Screen
■ Check input and signal items. (cf. work instructions)
1. HDMI1/2 (3440 x 1440 @60Hz)
2. DisplayPort1.2 (3440 x 1440 @60Hz) - using PC
4. Total Assembly line process
4.1. Write HDCP Key
Write HDCP Key into EEPROM by using DDC2AB protocol
& HDCP Adjustment Jig equipment. If error is occurred, try to
write again. After download HDCP key, send command ‘0xE6
00 00’ for loading RAM memory correctly.
4.2. White balance adjustment
- Adjust PRESET Warm(6500K) Color coordinates and
Gamma calibration .
■ Set the CA-210 for calibration.
■ Input Gamma calibration Pattern (R,G,B, Grey 20 )
■ Set as Warm(6500K) by commanding COLOR_MODE_
CHANGE Command code.
■ Gamma calibration and verify
■ Warm(6500K) color adjustment
Adjust to meet x/y color coordinate as below
x y
2~4 min 0.318 0.339
4~8 min 0.318 0.338
8~10 min 0.317 0.337
10~25 min 0.316 0.334
25~40 min 0.314 0.332
40 min~ 0.313 0.329
Save Warm(6500K) Color by commanding COLOR SAVE
Command code.
* * * *
* *
* * * ** * * * * * * ** * * *
** **
***
***
* * * *
* *
* * * ** * * * * * * ** * * *
** **
***
***
* * * *
* *
* * * ** * * * * * * ** * * *
** **
***
***
* * * *
* *
* * * ** * * * * * * ** * * *
** **
***
***

- 9 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Insert HDMI Jack which is connected with PC for White Bal-
ance or equivalent device.
→Total Assembly line should check whether the color
coordinate(x,y) data refer to below table were meet or not.
*Note : x,y coordinates are drifted about 0.007 after 30 mins
heat-run. So checking color coordinate within 5-min at
total assembly line, consider x,y coordinates might be
up to 0.007 than x,y target of each color temperature.
* Note : Manual W/B process
1) Power off => Power on (‘←’ 3 times, ‘→’ 1 time and push ‘
’)
2) and push the “←” or “→”.
3) In Service Menu.
* When doing Adjustment, Please make circumstance as
below.
4.3. DPM Operation check
■ Measurement Condition: 100 ~ 240 V @ 50/60Hz
(1) Set Input to DVI-D, DisplayPort, HDMI1, HDMI2
(2) Turn off the source device.
(3) Check DPM operation refer to the below table.
5. Signal composition for adjustment
5.1. I2C (100K BPS)
5.2. COMMUNICATION START
# Until ACK BIT goes LOW, Repeat it.
5.3. Command form.
Command form use DDC2AB standard communication
protocol.
a. LEN : DATA BYTE number to send.
b. CMD : Command language that monitor executes.
c. VAL : FOS DATA
d. CS : Dada’s CHECHSUM that transmit
e. DELAY : 50MS
f. A : Acknowledge
5.4. Screen adjust command (LENGTH = 84)
5.5. EEPROM Data Write
5.5.1 Siganl TABLE
LEN : 84h+Bytes
CMD : E8h
ADH : E2PROM Slave Address(A0,A2,A4,A6,A8,AA,AC,AE),
Not 00h(Reserved by Buffer To EEPROM)
ADL : E2PROM Sub Address(00~FF)
Data : Write data
Delay : 20ms
Color
Temperature
Cool 9,300 °K X=0.283 (±0.03)
Y=0.298 (±0.03)
<Test Signal>
Inner pattern
(255gray,80IRE)
Medium 8,000 °K X=0.295 (±0.03)
Y=0.305 (±0.03)
Warm 6,500 °K X=0.313 (±0.03)
Y=0.329 (±0.03)
Luminance
(cd/m²)
Cool Min : 170 <Test Signal>
Inner pattern
(255gray,80IRE)
Medium Min : 200
Warm Min : 260
Operating
Condition
Sync (H/V)
or Video
EUT
(MSPG6100)
LED
(SET)
Wattage
(W)
Sleep
mode
Off/Off Off White blinking 1.2W
Off
mode
- - Off 0.3
No.
Adjustment contents
CMD(h
ex)
AD R
VAL(hex)
Explanation
1
EEPR O M AL L IN ITIA
L
E4
00
00
adjustment Initialization
2
EEPR O M R EAD
E7
Slave add
At EEPR O M R e ad
3
EEPR O M W R ITE
E8
Slave add
D a ta
Write data at EEPROM
4
R GAIN
16
00
00-64
Tune Gain
5
G GAIN
18
00
00-64
6
B GAIN
00
00-64
7
BRIGHT(Backlight)
10
00
00-64
Tune Analog Bright
8
FAC T OR Y R ESET
F0
00
0
Factory reset
9
AUTO_COLOR_ADJ
U ST
F1
00
0
AUTO COLOR Tuning
0:Auto color
10
COLOR_MODE_CH
AN G E
F2
00
1
WARM(6500K)
2
COOL(9300K)
11
Elapsed time Clear
E9
00
00
Aging off &Clear elapse
d time
12
Aging On/Off
F3
00
FF/00
F F:O N / 0 0 :O F F
13
InputSelect
F4
00
0xD0
1:DisplayPort
0x90
2:HDMI1
0x91
3:HDMI2
0xD1
4:Thunderbolt (UC98 o
n ly )
14
SYSTEM R ESET
F5
00
00
RestartSystem
15
SelectLanguage
68
00
0x00 ~ 0x0F
00:English,
01:German
02:French
03:Spanish
04:Ita li a n
05:Swedish,
06:Fin nis h
07:Portuguese
08:Br a z il
09:Polis h
0A: Russian
0B: Greek
0C : Ukrainian
0D : Chinese
0E:Japanese
0F: Korean
EDID SN UPDATE
0x77
0
0x01~0x02
0x 01 :HDMI1
0x 02 :HDMI2
APD command
0x F7
00
0x00~0x01
0x 00:OFF
0x 01:ON
Module name
LM340UW3

- 10 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
5.5.2. Command Set
* Use
■ FOS Default write :
<14mode data> write
SyncFlags, HPeriodH, HPeriodL, VtotalH, VtotalL, SrcHTo-
talH, SrcHTotalL
SrcHStartH, SrcHStartL, SrcVStartH,SrcVStartL,
HsyncPhase
■ Temporary Data write: Write to particular address of EE-
PROM.
5.6. E2PROM Data Read
5.6.1. Signal TABLE
5.6.2. COMMAND SET
5.6.3. Use
Read E2PROM’s specic area as unit of 128(80h)-byte. (84h)
5.6.4 EDID Write
EEPROM access by using DDC2B protocol
■ 1-Byte write
L : 0x00~0x7F
D : data
■ 8-byte write
L : 0x00,0x10,….0x70
5.6.5. EDID Read
- DDC2B Command.(A0/A1)
- 128 Byte transfer of EDID Buffer of MICOM
No. Adjustment
contents
CMD(hex) LEN Explanation
1EEPROM
WRITE
E8 94 16-Byte Write
2 (84+n) n-byte Write
No. Adjustment
contents
CMD
(hex)
ADH
(hex)
ADL
(hex)
Explanation
1 EEPROM
READ
E7 A0 0 0-Page 0~7F Read
2 80 0-Page 80~FF Read
3 A2 0 1-Page 0~7F Read
4 80 1-Page 80~FF Read
5 A4 0 2-Page 0~7F Read
6 80 2-Page 80~FF Read
7 A6 0 3-Page 0~7F Read
8 80 3-Page 80~FF Read
9 A8 0 4-Page 0~7F Read
10 80 4-Page 80~FF Read
11 AA 0 5-Page 0~7F Read
12 80 5-Page 80~FF Read
13 AC 0 6-Page 0~7F Read
14 80 6-Page 80~FF Read
15 AE 0 7-Page 0~7F Read
16 80 7-Page 80~FF Read

- 11 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
TROUBLE SHOOTING GUIDE
1. No Power
Replace X200
N
Check C410
Voltage Level (19V)
Check Power connector
OK ? Replace Adapter
Y
N Y
Check IC400 Output
Voltage Level (3.3V)
Replace IC400 &
Recheck
Y
N
Check X200 Clock
12MHz
Check IC401 Output
Voltage Level (5V)
Replace IC401 &
Recheck
N
Y
Replace IC202 Flash
Memory
Y
Check IC403 Output
Voltage Level (1.15V, 1.8)
Replace IC403 &
Recheck
N
Y

- 12 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
2. No Screen on
Replace eDP Cable
N
Module Back Light On?
Check IC700, IC701
Replace LED Driver IC
Y
N
N
Check Panel Power 10V (L408)
Check IC402 Output 10V
Replace IC402 &
Recheck
Y
N
Check Panel eDP AUX
P101(#17,18)
Check IC200
Repair Scaler
Y
N
Check eDP FFC Cable for Damage
or Open Conductors
Check LED Driver Output
(IC700, IC701 –1,2,5,6 PIN)
Replace T-Con Board or Module
Y
Check IC204
Replace Main Scaler IC
N
Check WLED_ENABLE High?
(IC700, IC701 -3 PIN)
Y

- 13 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
3. No Video – HDMI
Replace Main Scaler
Check input signal format
Is it supported?
Check JK100(JK101) for
proper connection or
Damage
Replace Connector
Y
N
Check I2C Signal(EDID) Re Download EDID Data
Y
N
Y
Check HDMI Cable for
Damage or Open Connector
Y

- 14 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
4. No Video – DP
Replace Main Scaler
Check input signal format
Is it supported?
Check JK102 for proper
connection or Damage Replace Connector
Y
N
Y
Check DP Cable for Damage
or Open Connector
Y

- 15 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
BLOCK DIAGRAM
e-
DP
MST9U16Q1
(Mstar)
E-DP
DC Jack
HDMI Input
DP Input
USB UP
USB DN
X-TAL
12MHz
DP
SWITCH
HDMI
SWITCH
3.3V 12V
TMDS
TMDS
ASM1074
(USB HUB)
ASM1458
USB S/W USB3.0
USB3.0
USB 3.0
3.3V
3.3V 1.05V
X-TAL
25MHz
TMDS
TP A6138
(HP AMP)
HP
Audio L,R
+19V
USB
Quick
USB
Quick
USB 5V
USB 5V
DNW116
I2S SP(L)
SP(R)
3.3V 1.8V 1.15V
TMDS
TMDS

- 16 - LGE Internal Use OnlyCopyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes
EXPLODED VIEW
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts
are identified by in EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as recommended
in this manual to prevent Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
IMPORTANT SAFETY NOTICE
900
910
911
800
300
200
100
540
120
510
121
400
LV1 535