Specification; Adc Calibration; Pc Input Adc; Component Input Adc - LG 42PG20R Service Manual

1. Application Range
This spec. sheet is applied to all of the PP81A Chassis.

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±5cC 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) Before adjustment, execute Heat-Run for 30 minutes at RF
no signal.

3. ADC calibration

3-1. PC input ADC

(1) Auto RGB Gain/Offset Adjustment
1) Convert to PC in Input-source
2) Signal equipment displays
Output Voltage : 700 mVp-p
Impress Resolution XGA (1024 x 768 @ 60Hz)
Model : 60 in Pattern Generator
Pattern : 54 in Pattern Generator (MSPG-925 SERISE)
[1/2 Black & White Pattern (Refer below picture)].
3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)
0x00 0x02 instruction.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
INSTRUÇÕES DE REGULAÇÃO
<Fig. 1>
(2) Confirmation
1) We confirm whether "0xB6(RGB)" address of EEPROM
"0xA2" is "0xAA" or not.
2) If "0xB6(RGB)" address of EEPROM "0xB2" isn't "0xAA",
we adjust once more
3) We can confirm the ADC values from "0xB0~0xB5(RGB)"
addresses in a page "0xA2"
[ Manual ADC process using Service Remocon. After enter
Service Mode by pushing "ADJ" key, execute "ADC Adjust" by
G
pushing " " key at "Adjust-RGB".

3-2. COMPONENT input ADC

(1) Component Gain/Offset Adjustment
1) Convert to Component in Input-source
2) Signal equipment displays
Impress Resolution 720P
MODEL : 216 in Pattern Generator(720P Mode)
PATTERN : 33 in Pattern Generator( MSPG-925 SERISE)
Adjustment pattern (COMPONENT)
3) Adjust by commanding AUTO_COLOR_ADJUST(0xF1)
0x00 0x02 instruction
(2) Confirmation
1) We confirm whether "0xC8(720P)" address of EEPROM
"0xA2" is "0xAA" or not.
2) If "0xC8(720P)" address of EEPROM "0xA2" isn't "0xAA",
we adjust once more
3) We can confirm the ADC values from "0xB9~0xBE(480i)/
0xC2~(1080i)" addresses in a page "0xA2"
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LGE Internal Use Only