Adjustment Instruction - LG 55LF5950 Service Manual

1. Application
This spec. sheet applies to LA50H 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
3.2. Main PCBA Adjustments
(1) ADC adjustment(OTP) : Component
(2) EDID downloads for HDMI
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) Tool option menu, USB Download (S/W Update, Option
and Service only)
(2) Manual adjustment for White balance.
(3) Shipment conditions, Channel pre-set
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes

ADJUSTMENT INSTRUCTION

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4. MAIN PCBA Adjustments
4.1. ADC Calibration
- An ADC calibration is not necessary because MAIN SoC
(LGExxxx) is already calibrated from IC Maker
4.2. MAC Address, ESN Key and Widevine
Key, DTCP Key, HDCP1.4, HDCP2.0
download
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
- US, Canada models: DETECT -> MAC_WRITE ->
WIDEVINE_WRITE
(4) Play : START
(5) Check of result: Ready, Test, OK or NG
4.2.4. Communication Port connection
(1) Connect: PCBA Jig -> RS-232C Port == PC -> RS-232C
Port
4.2.5. Download
- All models (15Y LCD TV + MAC + Widevine + ESN Key +
HDCP1.4 and HDCP2.0)
4.2.6. Inspection
- In INSTART menu, check these keys.
LGE Internal Use Only