Adjustment Instruction; Automatic Adjustment; Adc Adjustment; Equipment & Condition - LG 55UF6800 Service Manual

1. Application Range
This spec. sheet applies to LA5ZY 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
15ºC
▪ 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
▪ MAC Address Download
▪ ADC adjustment : 480i Comp1, 1920*1080 Comp1
▪ EDID/DDC download
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
▪ White Balance adjustment
▪ RS-232C functionality check
▪ PING Test
▪ Factory Option setting per destination
▪ Ship-out mode setting (In-Stop)
3.3. Etc.
▪ Ship-out mode
▪ Service Option Default
▪ USB Download(S/W Update, Option, Service only)
▪ ISP Download (Option)
Copyright © LG Electronics. Inc. All rights reserved.
Only for training and service purposes

ADJUSTMENT INSTRUCTION

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4. Automatic Adjustment

4.1. ADC Adjustment

ADC adjustment is needed to find the optimum black level and
gain in Analog-to-Digital device and to compensate RGB
deviation.
4.1.1. Equipment & Condition
(1) USB to RS-232C Jig
(2) MSPG-925 Series Pattern Generator(MSPG-925FA,
pattern -65)
- Resolution : 480i Comp1
1080P Comp1
- Pattern : Horizontal 100% Color Bar Pattern
- Pattern level : 0.7±0.1 Vp-p
- Image
4.1.2. Adjustment method
▪ Using USB, adjust items listed in 3.1 in the other shown in
"4.1.3.3"
4.1.3. 3 Adj. protocol
Protocol Command
Enter adj. mode aa 00 00
Source change xb 00 40
xb 00 60
Begin adj. ad 00 10
Return adj. result
Read adj. data (main)
ad 00 20
(sub )
ad 00 21
Confirm adj. ad 00 99
End adj. ad 00 90
Ref.) ADC Adj. RS232C Protocol_Ver1.0
Adj. order
▪ aa 00 00 [Enter ADC adj. mode]
▪ x b 0 0 0 4 [ C h a n g e
Component1(480i&1080p)]
▪ ad 00 10 [Adjust 480i&1080p Comp1]
▪ xb 00 06 [Change input source to RGB(1024*768)]
▪ ad 00 10 [Adjust 1920*1080 RGB]
▪ aa 00 90 End adj.
Set ACK
a 00 OK00x
b 00 OK04x (Adjust 480i, 1080p Comp1 )
b 00 OK06x (Adjust 1920*1080 RGB)
OKx (Case of Success)
NGx (Case of Fail)
(main)
000000000000000000000000007c007b-
006dx
(Sub)
000000070000000000000000007c0083
0077x
NG 03 00x (Fail)
NG 03 01x (Fail)
NG 03 02x (Fail)
OK 03 03x (Success)
a 00 OK90x
i n p u t s o u r c e
LGE Internal Use Only
t o