View LG 37LT760H (CHASSIS:LD2FF) Service Manual online
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1. Application Range
This spec. sheet applies to LD2FF Chassis applied LCD TV
all models manufactured in TV factory.
(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 °C ± 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 AC 100-240
V~, 50/60 Hz.
(5) The receiver must be operated for about 5 minutes prior to
the adjustment when module is in the circumstance of over
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
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.
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. MAIN PCBA Adjustments
3.1. ADC Calibration
ADC adjustment is needed to find the optimum black level
and gain in Analog-to-Digital device and to compensate RGB
3.1.2. Equipment & Condition
(1) USB to RS-232C Jig
(2) MSPG-925 Series Pattern Generator (MSPG-925FA,
pattern - 65)
- Resolution : 1080P Comp1
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7 ± 0.1 Vp-p
3.1.3. Adjustment method
(1) Adjustment method
- Don’t need to adjust ADC because there is data in OTP
and adjusted initially.
3.2. MAC address D/L, CI+ D/L
3.2.1. Equipment & Condition
1) Play file: keydownload.exe
3.2.2. Communication Port connection
1) Key Write: Com 1,2,3,4 and 115200 (Baudrate)
2) Barcode: Com 1,2,3,4 and 9600 (Baudrate)
3.2.3. 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)
3.2.4. Communication Port connection
Connect: PCBA Jig → RS-232C Port== PC → RS-232C Port
- In INSTART menu, check these keys.
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