LG 42LN541C (CHASSIS:LA3AA) Service Manual ▷ View online
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
1. Application range
This spec sheet is applied LED TV with LA3AA chassis
2. Test condition
Each part is tested as below without special notice.
1) Temperature : 25 ºC ± 5 ºC(77 ± 9 ºF) , CST : 40 ºC±5 ºC
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
Market
Input voltage
Frequency
Remark
USA
110~240V
50/60Hz
Standard Voltage of each
product is marked by
models
4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM
5) The receiver must be operated for about 20 minutes prior to
the adjustment
3. Test method
1) Performance: LGE TV test method followed
2) Demanded other specification
- Safety : UL, CSA, IEC specification
- EMC: FCC, ICES, IEC specification
4. General Specification
No
Item
Specification
Result
Remark
1.
Receiving System
1) ATSC / NTSC-M / 64 QAM / 256 QAM
2.
Available Channel
1) VHF : 02~13
2) UHF : 14~69
3) DTV : 02-69
4) CATV : 01~135
5) CADTV : 01~135
3.
Input Voltage
AC 100 ~ 240V 50/60Hz
Mark : 110V, 60Hz (N.America)
4.
Market
NORTH AMERICA
5.
Screen Size
39/42/47/55 inch Wide (1920 × 1080)
FHD + 60Hz
All models without HD models
32 inch Wide (1366 × 768)
HD + 60Hz
6.
Aspect Ratio
16:9
7.
Tuning System
FS
8.
Module
Direct LED LC320DXE-SFR1
LGD
32LN541C-UA
LC420DUE-SFR1
LGD
42LN541C-UA, 42LN549E-UA
LC470DUE-SFR1
LGD
47LN541C-UA, 47LN549E-UA
POLA
LC550DUJ-SEE1
LGD
55LN541C-UA
9.
Operating Environment
1) Temp : 0 ~ 40 deg
2) Humidity : ~ 80 %
10. Storage Environment
1) Temp : -20 ~ 60 deg
2) Humidity : ~ 85 %
- 7 -
5. Supported video resolutions
5.1. Component input(Y, CB/PB, CR/PR)
No
Resolution
H-freq(kHz)
V-freq.(kHz)
Pixel clock
Proposed
1.
720*480
15.73
60.00
13.5135
SDTV ,DVD 480I
2.
720*480
15.73
59.94
13.50
SDTV ,DVD 480I
3.
720*480
31.50
60.00
27.027
SDTV 480P
4.
720*480
31.47
59.94
27.00
SDTV 480P
5.
1280*720
45.00
60.00
74.25
HDTV 720P
6.
1280*720
44.96
59.94
74.176
HDTV 720P
7.
1920*1080
33.75
60.00
74.25
HDTV 1080I
8.
1920*1080
33.72
59.94
74.176
HDTV 1080I
9.
1920*1080
67.50
60.00
148.50
HDTV 1080P
10.
1920*1080
67.432
59.94
148.352
HDTV 1080P
11.
1920*1080
27.00
24.00
74.25
HDTV 1080P
12.
1920*1080
26.97
23.94
74.176
HDTV 1080P
13.
1920*1080
33.75
30.00
74.25
HDTV 1080P
14.
1920*1080
33.71
29.97
74.176
HDTV 1080P
- 8 -
ADJUSTMENT INSTRUCTION
1. Application
This spec. sheet applies to LA3AA Chassis applied LED TV all
models manufactured in TV factory
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 ºC of temperature and 65±10% of relative humidity if
there is no specific designation
(4) The input voltage of the receiver must keep 100~240V,
50/60Hz
(5) At first Worker must turn on the SET by using Power Only
key.
(6) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15 ºC
In case of keeping module is in the circumstance of 0°C, it
should be placed in the circumstance of above 15°C for 2
hours
In case of keeping module is in the circumstance of below
-20°C, it should be placed in the circumstance of above
15°C for 3 hours.
※
Caution
When still image is displayed for a period of 20 minutes or
longer (especially where W/B scale is strong.
Digital pattern 13ch and/or Cross hatch pattern 09ch), there
can some afterimage in the black level area
3. Adjustment items
3.1. Main PCBA Adjustments
(1) ADC adjustment : ADC adjustment is OTP (Auto ADC)
(2) EDID download : HDMI
■ Above adjustment items can be also performed in Final
Assembly if needed.
Both Board-level and Final assembly adjustment items can
be check using In-Start Menu (1.Adjust Check).
3.2. Final assembly adjustment
(1) White Balance adjustment
(2) RS-232C functionality check
(3) Factory Option setting per destination
(4) Shipment mode setting (In-Stop)
(5) GND and HI-POT test
3.3. Appendix
(1) Shipment conditions
(2) Tool option menu
(3) USB Download (S/W Update, Option and Service only)
(4) Preset CH Information
4. MAIN PCBA Adjustments
4.1. ADC Adjustment
4.1.1. Overview
▪ ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate RGB
deviation.
4.1.2. Equipment & Condition
(1) Protocol: RS-232C
(2) Inner Pattern
- Resolution : 1024*768(RGB)
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
4.1.3. Adjustment
4.1.3.1. Adjustment method
- Connect to Jig by using RS-232(USB), adjust RGB
※
Manual adj (If needed in Final Assembly)
- Required equipment : Adjustment R/C
- Enter Service Mode by pushing “ADJ” key,
- Start ‘OTP’ ADC Type by pushing ‘►’ key at [7. ADC
Calibration]
Protocol
CMD 1 CMD 2 Data 1 Data 2
Remark
Enter adj
mode
a
a
00
00
When transfer the ‘Mode
In’,Carry the command
Start ADC
adj
a
d
00
10
Automatically adjustment
(Use internal pattern)
4.1.3.3. ADC RGB
1) Press the In-start Key on the ADJ remote after at least 1
min of signal reception. Then, select ADC Calibration. And
Press OK Button on the menu “Start”. The adjustment will
start automatically.
2) If ADC RGB is successful, “ADC RGB Success” is
displayed and ADC RGB is completed. If ADC calibration is
failure, “ADC RGB Fail” is displayed.
3) If ADC calibration is failure, after rechecking ADC pattern or
condition, retry calibration
- 9 -
4.2. EDID Download
4.2.1. Overview
▪ 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”.
4.2.2. Equipment
(1) Since EDID data is embedded, EDID download JIG, HDMI
cable is not need.
(2) Adjust by using remote controller
4.2.3. Download method
(1) Press Adj. key on the Adj. R/C.
(2) Select EDID D/L menu.
(3) By pressing Enter key, EDID download will begin
(4) If Download is successful, OK is display, but If Download is
failure, NG is displayed.
(5) If Download is failure, Re-try downloads.
※
※
Caution : When EDID Download, must remove HDMI
Cable.
4.2.3.1. Models for EDID Data
2D
8bit-HD
8bit-FHD
(PCM)
32LN541C-UA
39/42/47/55
LN541C-UA
LN549E-UA
4.3. Tool Option Input
- Input Model Tool Option according to BOM
5. Final Assembly Adjustment
5.1. White Balance Adjustment
5.1.1. Overview
5.1.1.1. W/B adj. Objective & How-it-works
(1) Objective: To reduce each Panel’s W/B deviation
(2) How-it-works: When R/G/B gain in the OSD is at 192, it
means the panel is at its Full Dynamic Range.
▪ Case : Cool Mode
- To adjust the white balance without the saturation, G gain
should be adjust at least 172 and change the others (R,B
Gain)
※
When R or B gain is over 255, G gain can be adjust below
172)
▪ Case : Medium / Warm Mode
- To adjust the white balance without the saturation, Fix the
one of R/G/B gain to 192 (default data) and decrease the
others.
(3) Adj. condition: normal temperature
- Surrounding Temperature: 25±5 ºC
- Warm-up time: About 5 Min
- Surrounding Humidity: 20% ~ 80%
- Before White balance adjustment, Keep power on status,
don’t power off
5.1.1.2. Adj. condition and cautionary items
(1) Lighting condition in surrounding area surrounding lighting
should be lower 10 lux. Try to isolate adj. area into dark
surrounding.
(2) Probe location: Color Analyzer (CA-210) probe should be
within 10cm and perpendicular of the module surface
(80°~ 100°)
(3) Aging time
- After Aging Start, Keep the Power ON status during 5
Minutes.
- In case of LCD, Back-light on should be checked using no
signal or Full-white pattern.
5.1.2. Equipment
(1) Color Analyzer: CA-210 (NCG: CH 9 / WCG: CH12 / LED:
CH14)
(2) Adj. Computer(During auto adj., RS-232C protocol is
needed)
(3) Adjust Remocon
(4) Video Signal Generator MSPG-925F 720p/204-Gray
(Model:217, Pattern:49)
→ Only when internal pattern is not available
※ Color Analyzer Matrix should be calibrated using
CS-1000
Click on the first or last page to see other 42LN541C (CHASSIS:LA3AA) service manuals if exist.