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
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 th e cir cuitry 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 MΩ and 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 exp ose d metallic par t. 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.
This spec. sheet is applied all of 47”/55” LCD TV, LT23E
chassis by manufacturing LG TV Plant all over the world
2. Specification
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test instrument..
(2) Adjustment must be done in the correct order
(3) The adjustment must be performed in the circumstance of
25 ºC ±5 ºC of temperature and 65±10% of relative
humidity if there is no specific designation.
(4) The input voltage of the receiver must keep 100~220V,
50/60Hz
(5) Before adjustment, execute Heat-Run for 5 minutes at RF
no signal.
3. Adjustment items
3.1. PCB assembly adjustment items
(1) MAC Address, ESN Key and Wide-vine Key D/L
(2) LAN Test( Ping-Test )
(3) Main S/W program download : Using USB Memory stick
(4) Input Tool - Option
(5) Download EDID : EDID data are automatically downloaded
when adjusting the Tool Option.
(6) ADC Calibration – RGB & Component
(7) Check SW Version
4. PCB assembly adjustment method
4.1. MAC Address, ESN Key and Wide-vine
Key Download
(1) Input Area option.
(2) Adjustment of White Balance : Auto
(3) Adjustment of White Balance : Manual
(4) Intelligent Sensor Inspection Guide
(5) LAN Inspection Guide
(6) Widevine Key Inspection Guide
(7) Model name & Serial number D/L
(8) Wi-Fi MAC Address Check
(9) Local Dimming Inspection Guide
(10) Preset CH information
(11) Internal Press Test
(12) Motion Remote controller Inspection
(13) 3D Function test
▪ Tool Option Input : PCBA Check Process
▪ Area Option Input : Set Assembly Process
*** Tool Option table
MODEL55LM960047LM960047LM860072LM9500
Tool Option133001329993298333148
Tool Option246421464214232550517
Tool Option321325213252135721325
Tool Option421039210391284521039
Tool Option52306323063230636677
Tool Option61321132113211321
Tool Option763019630196276363019
After Input Tool Option and AC off
Before PCBA check, you have to change the Tool option and
have to AC off/on (Plug out and in)
(If missing this process, set can operate abnormally)
4.4.1. Profile
Must be changed the option value because being different with
some setting value depend on module maker, inch and market
4.4.2. Equipment
Adjustment remote control
4.5. EDID D/L method
Recommend that don’t connect HDMI and RGB(D-SUB) cable
when downloading the EDID.
If not possible, recommend that connect the MSPG equipment.
There are two methods of downloading the edid data
It is a VESA regulation. A PC or a MNT will display an optimal
resolution through information
Sharing without any necessity of user input. It is a realization
of “Plug and Play”
4.5.1. 1st Method
EDID datas are automatically downloaded when adjusting the
Tool Options.
Automatically downloaded when pushing the enter key after
adjusting the tool option5.
It takes about 2seconds
4.5.2. 2nd Method
● Caution : Must be checked that the tool option is right or not.
If tool option is wrong, hdmi edid data could not be
downloaded well.
1) Press the ADJ key
2) Move to the 10. EDID D/L and Press the right direction
key(►)
3) Press the right direction key(►) at Start.
4) After about a few seconds, appear “Waiting..” => “OK”, then
compele.
4.4.3. Adjustment method
The input methods are same as other chassis.(Use ADJ Key
on the Adjust Remocon.)
(If not changed the option, the input menu can differ the model
spec.)
Re fe r to Job Expre ss ion of each main ch assis ass’ y
(EBTxxxxxxxx) for Option value
Caution : Don’t Press “IN-STOP” key after completing the
function inspection.
4.5.3. RS-232C command Method
1) Command : AE 00 10
● Caution : Don’t connect HDMI and RGB(D-SUB) cable when
5.2.2. Adjustment of White Balance (for Manual adjustment)
▪ Co lor analyzer(CA100+, CA210) should be used in the
calibrated ch by CS-1000
▪ Operate the zero-calibration of the CA100+ or CA-210, then
stick sensor to the module when adjusting.
▪ For manual adjustment, it is also possible by the following
sequence.
1) Select white pattern of heat-run by pressing “POWER ON”
key on remote control for adjustment then operate heat run
longer than 15 minutes.
(If not executed this step, the condition for W/B may be
different.)
2) Push “Exit” key.
3) Change to the AV mode by remote control.
4) Input external pattern (80% white pattern)
5) Push the ADJ key => Enter “0000” (Password)
6) Select “3. W/B ADJUST”
7) Enter the W/B ADJUST Mode
8) Stick the sensor to the center of the screen and select each
items (Red/Green/Blue Gain and Offset) using ▲/▼(CH +/-)
key on R/C..
9) Adjust R/ G/ B Gain using ◄/►(VOL +/-) key on R/C.
10) Adjust three modes all (Cool / Medium / Warm) : Fix the
one of R/G/B gain and change the others
11) When adjustment is completed, Enter “COPY ALL”
12) Exit adjustment mode using EXIT key on R/C.
※ CASE
First adjust the coordinate far away from the target value(x, y).
(1) x, y >target
i) Decrease the R, G.
(2) x, y < target
i) First decrease the B gain,
ii) Decrease the one of the others.
(3) x >target , y< target
i) First decrease B, so make y a little more than the target.
ii) Adjust x value by decreasing the R
(4) x < target , y >target
i) First decrease B, so make x a little more than the target.
ii) Adjust x value by decreasing the G
● Standard color coordinate and temperature when using the
CA100+ or CA210 equipment
Color coordinate
Mode
Temp
△uv
X Y
Cool
0.269±0.002 0.273±0.002 13000K
0.0000
Medium 0.285±0.002 0.293±0.002 9,300 K 0.000
Warm 0.313±0.002 0.329±0.002 6,500K 0.003
Change reason : When vivid mode, more detail than other
company set.
GP3Aging
GP3Aging
GP3Aging
● In case of Edge LED module, the color coordinates is changing
by aging, so you have to use the below table.
The Time Table of color coordinates by SET Aging Time
■ In the SET applied LED module (LS5700/LM6200/LM6600/
LM7600 Series), cause of the physical characteristics of
LED Module, sets are taken a 120 minutes by aging time
to stabilize a color coordinates. So White Balance Control
equipments have to get the SET Aging Time from the SET
and then going to control the W/B by revise color coordinates
at each time
5.3. Intelligent Sensor Inspection Guide
Step 1. Turn on the TV set.
Step 2. Press “EYE” button on the Adjustment remote controller.
Step 3. Block the Intelligent Sensor module on the front C/A
about 6 seconds.
When the “Sensor Data” is lower than 20, you can see the
“OK” message -> If it doesn’t show “OK” message, the Sensor
Module is defected one.
You have to replace that with a good one.
Green Eye-Check
Sensor Data : 492
BackLight : 100
OK
- To check the Coordinates of White Balance, you have to
measure at the below conditions.
Picture Mode : select Vivid and change
Dynamic Contrast : Off ,
Dynamic Colour : Off,
Clear White : Off
->Picture Mode change : Vidid -> Vivid(User)
(If you miss the upper condition, the coordinates of W/B can be
lower than the spec.)
Step 4. After check the “OK” message come out, take out your
hand from the Sensor module.
-> Check “Sensor Data” value change from “0” to “300” or not.
If it doesn’t change the value, the sensor is also defected
one. You have to replace it.
5.4. LAN Inspection
1) LAN Port connection with PCB
2) Network setting at MENU Mode of TV
3) Setting automatic IP
4) Setting state conrmation
5) If automatic setting is nished, you conrm IP and MAC
1) Conrm Key input Data at the “IN START” MENU Mode
5.6. Model name & Serial number D/L
5.6.1. Notice
1) Serial number D/L is using of scan equipment.
2) Setting of scan equipment operated by Manufacturing
Technology Group.
3) Serial number D/L must be conformed when it is produced in
production line, because serial number D/L is mandatory by
D-book 4.0
4) Check the model name In-start menu -> Factory name
displayed (ex 32LS5700-DA)
5) Check the Diagnostics (DTV country only) -> Buyer model
displayed (ex 32LS5700-DA)
5.7. Wi-Fi MAC ADDRESS CHECK
5.7.1. Notice
1) Using RS232
CommandSet ACK
Transmission [A][l][][Set ID][][20][Cr][O][K][x] or [N][G]
2) Check the menu on in-start
5.6.2. Method : Auto
1) Press “Power on” key of service remocon.(Baud rate : 115200
bps)
2) Connect RS232 Signal Cable to RS-232 Jack
3) Write Serial number by use RS-232.
4) Must check the serial number at Instart menu
5.6.3. Method : Manual
* If the TV set is downloaded By OTA or Service man, Sometimes
model name or serial number is initialized.
( Not always) It is impossible to download by bar code scan, so
It need Manual download.
1) Press the ‘instart’ key of ADJ remote controller.
2) Go to the menu ‘6.Model Number D/L’ like below photo.
3) Input the Factory model name or Serial number like photo.
5.8. Local Dimming Inspection (Optional)
5.8.1. Edge LED models with local dimming
1) Press ‘TILT” key of the Adj. R/C and check moving patterns. The black bar patterns moves from left to right. If local
dimming function does not work, a whole screen shows full
white.