55LH80YD (CHASSIS:LB91F) - LG TV Service Manual (repair manual). Page 11

This  specification  sheet  applied  to  LB92F  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.  But  it  is

flexible when its factory local problem occurs. . 

3)  The  adjustment  must  be  performed  in  the  circumstance  of

25±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 220V, 60Hz. 
5) Before adjustment, execute Heat-Run for 5 minutes.
6) Displayed 100% White Pattern in state of Heat-Run 

• How to make set white pattern   

1) Press Power ON button of Service Remocon  
2) Press  ADJ  button  of  Service  remocon.  Select  “7.  Test

pattern” and, after select “White” using navigation button,
and then you can see 100% Full White pattern.    

*  In  this  status  you  can  maintain  Heat-Run  useless  any

pattern generator 

*  Notice:  if  you  maintain  one  picture  over  20  minutes

(Especially  sharp  distinction  black  with  white  pattern  or
Cross  hatch  pattern)  then  it  can  appear  image  stick  near
black level. 

* Confirm Tool option before adjustment
* You must confirm and modify that Media-box option in state of

Wireless or wired and TV option in state of HDMI5.

- ADC Calibration(Media-Box Only)
- 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-Star Menu 1.ADJUST
CHECK.

* Don't  use  Instop  key  after  Media-Box  Main  b/d  board  test

and Media-Box assemble & test. 

- Wireless Pairing
- White Balance adjustment
- RS-232C functionality check
- Factory Option setting per destination
- EYE-Q Test
- Ship-out mode setting (In-Stop)

4.1.1 Overview

ADC adjustment is needed to find the optimum black level and
gain  in  Analog-to-Digital  device  and  to  compensate  RGB
deviation.

4.1.2  Equipment & Condition

- ADC Comp 480i / ADC Comp 1080p

=> Select  component  480i  signal  that  is  same  as  the

image  below  on  the  Media-Box  with  using  Pattern
Generator(MSPG-925FA or etc)

3) Adjustment ADC RGB

4) Image

4.1.3 Adjustment

4.1.3.1 Adjustment method

- Using RS-232, adjust items listed in 3.1 in the other shown in

“4.1.3.3”

Ref.) ADC Adj. RS232C Protocol_Ver1.0

4.1.3.2 Adj. order
- aa 00 00  [Enter ADC adj. mode]
- xb 00 04  [Change input source to Component1]
- ad 00 10  [Adjust 480i Comp1]
- xb 00 60  [Change input source to RGB-DTV]
- ad 00 10  [Adjust 1080p Comp1/RGB]
- ad 00 90  End adj.

- 11 -

Protocol

Command

Set ACK

Enter adj. mode

aa 00 00

a 00 OK00x

Source change

xb 00 40

b 00 OK40x (Adjust 480i Comp1 )

xb 00 60 

b 00 OK60x (Adjust 1024*768 RGB)

Begin adj.

ad 00 10

Return adj. result

OKx (Case of Success)

NGx (Case of Fail)

Read adj. data

(main)

(main)

ad 00 20 

000000000000000000000000007c007b006dx

(sub)

(Sub)

ad 00 21

000000070000000000000000007c00830077x

Confirm adj.

ad 00 99

NG 03 00x (Fail)

NG 03 01x (Fail)

NG 03 02x (Fail)

OK 03 03x (Success)

End adj.

aa 00 90

a 00 OK90x