DOWNLOAD LG 42LF20FR (CHASSIS:LP91A) Service Manual ↓ Size: 7.76 MB | Pages: 28 in PDF or view online for FREE

Model
42LF20FR (CHASSIS:LP91A)
Pages
28
Size
7.76 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lf20fr-chassis-lp91a.pdf
Date

LG 42LF20FR (CHASSIS:LP91A) Service Manual ▷ View online

- 9 -
ADJUSTMENT INSTRUCTION
1. Application Range
This specification sheet is applied to all of the LCD TV,
LP91A/B/C/D chassis.
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 ±5 °C 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) Download the MSTAR main software
(IC800, Mstar ISP Utility)
1) Using D/L Jig
2) Using USB Memory Stick.
(2) Input Tool-Option/Area option.
(3) Download the EDID
- EDID datas are automatically download when adjusting
the Tool Option2
(4) ADC Calibration – RGB / Component
(4) Check SW Version.
3.2. SET assembly adjustment items
(1) Input Area option
(2) Adjustment of White Balance : Auto & Manual
(3) Input Tool-Option/Area option
(4) Intelligent Sensor Inspection Guide
(5) Preset CH information
(6) Factoring Option Data input
4. PCB assembly adjustment method
4.1. Mstar Main S/W program download
4.1.1. Using D/L Jig
(1) Preliminary steps
1) Connect the download jig to D-sub(RGB) jack
(2) Download steps
1) Execute ‘ISP Tool’ program, the main window(Mstar ISP
utility Vx.x.x) will be opened
2) Click the “Connect” button and confirm “Dialog Box”
3) Click the “Config.” button and Change speed I2C Speed
setting : 350Khz~400Khz
4) Read and write bin file.
Click “(1)Read” tab, and then load download
file(XXXX.bin) by clicking “Read”.
-  LH20/ LH30
1
Filexxx.bin
1
Filexxx.bin
Filexxx.bin
5) Click “(2)Auto” tab and set as below
6) Click “(3)Run”.
7) After downloading, you can see the “(4)Pass” message.
4.1.2. Using the Memory Stick
* USB download : Service Mode
1) Insert the USB memory stick to the ISB port.
2) Automatically detect the SW Version.
-> S/W download process is executed automatically.
3) Show the message “Copy the file from the Memory”
4) After Finished the Download, Automatically DC Off -> On
5) Check The update SW Version.
4.2. Input tool option.
Adjust tool option refer to the BOM.
- Tool Option Input : PCBA Check Process
- Area Option Input : Set Assembly Process
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)
(1) Profile : Must be changed the option value because being
different with some setting value depend on
module maker, inch and market 
(2) Equipment : adjustment remote control.
(3). Adjustment method
- The input methods are same as other chassis.(Use IN-
START Key on the Adjust Remocon.)
(If not changed the option, the input menu can differ the
model spec.)
Refer to Job Expression of each main chassis ass’y
(EBTxxxxxxxx) for Option value  
Caution : Don’t Press “IN-STOP” key after completing the
function inspection.
4.3. 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
4.3.1. 1st Method
EDID datas are automatically downloaded when adjusting the
Tool Option2.
Automatically downloaded when pushing the enter key after
adjusting the tool option2.
It takes about 2seconds.
4.3.2. 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 EDID D/L and Press the right direction key(
G
)
3) Press the right direction key(
G
) at Start.
4) After about a few seconds, appear “OK”, then compele.
4.3.3. RS-232C command Method
(1) Command : AE 00 10 
* Caution 
Don’t connect HDMI and RGB(D-SUB) cable when
downloading the EDID.
If the cables are connected, Downloading of edid could be
failed.
- 10 -
1
Filexxx.bin
 
 
4.3.4. EDID data
(1) Analog(RGB): 128bytes>
(2) HDMI 1 : 256Bytes
(3) HDMI 2 : 256Bytes
(4) HDMI 3 : 256Bytes
4.4. ADC Calibration
4.4.1. ADC Calibration - Component (Using External pattern)
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925F/MSPG-1025/MSPG-3233 Pattern Generator
(2) Process
1) Change the Input to Component1 or 2 mode.
2) Input the Component 480i@60Hz 100% Color Bar
YPbPr signal into Component1 or 2.
(MSPG-925F Model: 209 / Pattern: 65 )
3) Press ADJ key on R/C for adjustment.
4) Enter Password number. Password is “0 0 0 0”.
5) Select “0. ADC calibration : Component” by using 
D
/
E
(CH +/-) and press ENTER(
A
).
6) ADC adjustment is executed automatically .
7) When ADC adjustment is finished, this OSD appear
4.4.2. ADC Calibration -  RGB (Using External pattern)
(1) Required Equipments
- Remote controller for adjustment
- MSPG-925F/MSPG-1025/MSPG-3233 Pattern Generator
(2) Process
1) Change the Input to RGB mode..
2) Input the PC 1024x768@60Hz Horizontal Color Bar
signal into RGB.
(MSPG-925F Model: 60 / Pattern: 65 ) 
3) Press ADJ key on R/C for adjustment.
4) Enter Password number. Password is “0 0 0 0”.
5) Select “0. ADC calibration : RGB” by using 
D
/
E
(CH +/-)
and press ENTER(
A
).
6) ADC adjustment is executed automatically .
7) When ADC adjustment is finished, this OSD appear
- 11 -
OK
OK
4.5. Check SW Version
(1) Method
1) Push In-star key on Adjust remote-controller.
2) SW Version check
Check “SW VER : V3.xx” – LH70
5. PCB assembly adjustment method
5.1. Input Area-Option
(1) Profile : Must be changed the Area option value because
being different of each Country’s Language and
signal Condition.  
(2) Equipment : adjustment remote control.
(3) Adjustment method 
- The input methods are same as other chassis.(Use IN-
START Key on the Adjust Remocon.)
Refer to Job Expression of each main chassis ass’y
(EBTxxxxxxxx) for Option value.
* White Balance Adjustment
- Purpose : Adjust the color temperature to reduce the
deviation of the module color temperature.
- Principle : To adjust the white balance without the saturation,
Fix the one of R/G/B gain to 192 (default data)
and decrease the others.
- Adjustment mode : Three modes – Cool / Medium / Warm
- Required Equipment
1) Remote controller for adjustment 
2) Color Analyzer : CA100+ or CA-210 or same product -
LCD TV( ch : 9 ),
(should be used in the calibrated ch by CS-1000)
3) Auto W/B adjustment instrument(only for Auto adjustment)
5.2. Adjustment of White Balance
: (For automatic adjustment)
* LP91A~D Support RS-232C & I2C DDC Communication-
White Balance Mode.
(1) Enter the adjustment mode of DDC
- Set command delay time : 50ms
- Enter the DDC adjustment mode at the same time heat-
run mode when pushing the power on by power only key
- Maintain the DDC adjustment mode with same condition
of Heat-run => Maintain after AC off/on in status of Heat-
run pattern display)
(2) Release the DDC adjustment mode
- Release the adjust mode after AC off/on or std-by off/on
in status of finishing the Hear-run mode
- Release the Adjust mode when receiving the aging off
command(F3 00 00) from adjustment equipment.
- Need to transmit the aging off command to TV set after
finishing the adjustment.
- Check DDC adjust mode release by exit key and release
DDC adjust mode)
(3) Enter the adjust mode of white balance)
- Enter the white balance adjustment mode with aging
command (F3, 00, FF)
* Luminance min value is 150cd in the Cool/Medium/Warm
mode(For LCD)
5.3. Adjustment of White Balance
(for Manual adjustment)
(1) Color  analyzer(CA100+, CA210) should be used in the
calibrated ch by CS-1000
(2) Operate the zero-calibration of the CA100+ or CA-210,
then stick sensor to the module when adjusting.
(3) 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 (85% 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
D
/
E
(CH +/-) key on R/C..
9) Adjust R/ G/ B Gain using 
F
/
G
(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.
- 12 -
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