Adjustment Instruction - LG 20LS1R-ZG Service Manual

1. Application
This document is applied to 20.1" LCD TV(or Monitor TV)
which is manufactured in Monitor (or TV) Factory or is
produced on the basis of this data
2. Designation
2.1 The adjustment is according to the order which is
designated and which must be followed, according to the
plan which can be changed only on agreeing.
2.2. Power Adjustment: Free Voltage
2.3. Magnetic Field Condition: Nil
2.4. Input signal Unit: Product Specification Standard
2.5. Reserve after operation: Above 30 Minutes
2.6. Adjustment equipments: Pattern Generator (MSPG-925L
or Equivalent), DDC Adjustment Jig equipment, SVC
remote controller
3. Main PCB check process
* Caution *
If DDC CMD don't work, please check below.
IIC_SW is "0" or "1".
- IIC_SW "0" : DDC Communications.
(DDC2AB) in Factory Side
-IIC_SW "1" : EDID Write/Read (DDC2B) and Factory
default(Shipping Condition).
How to change IIC_SW
1.Power-on state
2. Push "IN-START" key in SVC remote controller
3. Enter "Etc." menu, II_SW Change 0 or 1 by "VOL+" key
3.1 APC
After Manual-Insult, executing APC
3.2 ISP UOC file
3.2.1 Required Equipment
- JIG for ISP
- PC that is installed with "WISP" program.
- Control + Power LED PCB Ass'y
3.2.2 ISP Sequence
1) Connect main pcb ass'y with JIG for ISP
2) Execute "WISP" Program
3) Compare UOC version in BOM with version of hex file.
4) Push "Browse..." button in WISP program and select
hex file
5) Push "Auto Execute" button
6) Occur an Error, try again and again. 4)~5)
7) After finishing ISP, Must AC off / ON
8) Amber LED is blink during write default value in
EEPROM (24C32)
9) ALL ISP process is finished when Amber LED is off and
Blue LED is ON
10) After ISP, automatically input source change "AV2"
and II_SW set to °∞0°±)

ADJUSTMENT INSTRUCTION

3.3 ADC Process
"IIC_ SW" must set "0" for Auto Adjust (After ISP,
automatically set "0")
3.3.1 DCXO setting in Video
Signal equipment displays
A
Output Voltage : 700 mVp-p
Impress Resolution : CVBS NTSC-J 60Hz .
Pattern : 8 Color-Bar pattern (Refer below picture).
(Model:207, Pattern: 33 at MSPG925)
(DCXO setting is done automatically by DDC
communication)
[DEXO adjustment pattern]
3.3.2 AV2 input ADC
3.3.2.1 Auto Gain/Offset Adjustment
Signal equipment displays
A
Output Voltage : 700 mVp-p
Impress Resolution : CVBS 576i.
Pattern : gray pattern that left & right is black and center is
white signal (Refer below picture).
(Model:202, Pattern: 29 at MSPG925L)
Adjust by commanding AUTO_COLOR_ADJUST (0xF1)
A
0x00 0x00 instruction.
3.3.2.2 Confirmation
Convert to PC in Input-source
A
Signal equipment displays
A
Output Voltage : 700 mVp-p
Impress Resolution SXGA (1280 x 1024 @ 60Hz)
Pattern : gray pattern that left & right is black and center is
white signal (Refer below picture).
(Model : 45, Pattern : 28 at MSPG925L)
Adjust by commanding AUTO_COLOR_ADJUST (0xF1)
A
0x00 0x00 instruction.
3.3.3 RGB-PC input ADC
3.3.3.1 Auto Gain/Offset Adjustment
SConvert to PC in Input-source
A
Signal equipment displays
A
Output Voltage : 700 mVp-p
Impress Resolution SXGA (1280 x 1024 @ 60Hz)
Pattern : gray pattern that left & right is black and center is
white signal (Refer below picture).
(Model : 45, Pattern : 28 at MSPG925L)
Adjust by commanding AUTO_COLOR_ADJUST(0xF1)
A
0x00 0x00 instruction.
3.3.3.2 Confirmation
We confirm whether "0x00" address of EEPROM "0xA0" is
A
"0xAA" or not.
If "0x00" address of EEPROM "0xA0" isn't "0xAA", we
A
adjust once more
We can confirm the ADC values from "0x06~0x0B"
A
addresses in a page "0xA0"
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