Read LG 42LT760H-SA (CHASSIS:LJ3AZ) Service Manual online
- 8 -
ADJUSTMENT INSTRUCTION
1. Application Range
This spec. sheet applies to LJ3AZ 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 ±5ºC 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) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
15
▪ 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 PCB Check Process
(1) MAC Address Download
(2) CI+ Key Download
(3) Adjust 1920*1080 RGB
(4) EDID downloads for HDMI and RGB-PC
● Remark
- Above adjustment items can be also performed in Final
Assembly if needed. Adjustment items in both PCBA and
final assembly stages can be checked by using the INSTART
Menu -> 1.ADJUST CHECK
3.2. Final Assembly adjustment
(1) White Balance adjustment
(2) Adjust ADC (OPT)
(3) RS-232C functionality check
(4) PING Test
(5) Factory Option setting per destination
(6) Ship-out mode setting (IN-STOP)
(7) GND and HI-POT test
3.3. Appendix
(1) Tool option menu, USB Download (S/W Update, Option and
Service only)
(2) Manual adjustment for ADC calibration and White balance.
(3) Shipment conditions, Channel pre-set
4. MAIN PCBA Adjustments
4.1. ADC Calibration
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) USB to RS-232C Jig
2) MSPG-925 Series Pattern Generator(MSPG-925FA, pattern
-65)
- Resolution : 1080P Comp1
1920*1080P RGB
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
- Image
4.1.3. Adjustment method
▪ Don’t need to adjust ADC because there is data in OTP and
adjusted initially
4.2. MAC Address D/L and CI+ D/L (Widevine
and ESN : Spec Out)
4.2.1. Equipment & Condition
1) Play file: keydownload.exe
4.2.2. Communication Port connection
1) Key Write: Com 1,2,3,4 and 115200 (Baudrate)
2) Barcode: Com 1,2,3,4 and 9600 (Baudrate)
4.2.3. Download process
1) Select the download items.
2) Mode check: Online Only
3) Check the test process
- DETECT -> MAC -> CI+
4) Play: START
5) Check of result: Ready, Test, OK or NG
6) Printer Out (MAC Address Label)
4.2.4. Communication Port connection
1) Connect: PCBA Jig->RS-232C Port == PC->RS-232C Port
Click on the first or last page to see other 42LT760H-SA (CHASSIS:LJ3AZ) service manuals if exist.