DOWNLOAD LG 42LB1DRA (CHASSIS:LA61A) Service Manual ↓ Size: 11.23 MB | Pages: 56 in PDF or view online for FREE

- 9 -

These instructions are applied to all of the LCD TV, LA61A.

(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 equipment.

(2) Adjustments must be done in the correct order.
(3) The adjustments 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 be must kept 110V, 60Hz

when adjusting.

(5) The receiver must be operational for about 15 minutes

prior to the adjustments.  

O

Preliminary action is applied to the test for afterimage

discharge detection, and 100% FULL WHITE PATTERN
must be operated automatically.

O

Test for afterimage discharge detection

1) After pressing Power Only key(only operating by

pressing Power Only key), Full Test Pattern(2 min
30sec) --> Full Black Pattern(30sec) --> After this state,
Full White Pattern is displayed.
(but you must preset the program for Full White State
when you press the Main Power Off/On) 

2) Pattern Mode is deselected by pressing CH +/-, Exit Key.

[ Set is activated HEAT-RUN without signal generator in this

mode.

(1) Test Equipment: PC, Jig for download
(2) Connect the power of VSC B/D.
(3) Execute download program(iMPACK) of PC.
(4) After executing the hot key on the Programmer, click icon
(5) End after confirming

(1) As shown below, connect the MPLAB ICD2 equipment, PC

and Digital Connector.

(2) Turn on the MPLAB ICD2 POWER Supply.
(3) After turn on the PC and MONITOR, select the ‘MPLAB

IDE’ from the screen.

(1) When the program is executed, select the MPLAB ICD2

from Programmer -> Select Programmer . 

Test Pattern 2min 30sec

Test Pattern 30sec

If you turn on a still screen more than 20 minutes (Especially
Digital pattern(13 CH), Cross Hatch Pattern), an afterimage
may occur in the black level part of the screen.

PC

VSC

B/D

+13V

<Digital Board>

Connect the MPLAB ICD2 and connector of Digital Board

Connect the RS-232 or USB Cable

GND
Data

- 10 -

(2) Select "Configure -> Select Device".

(3) When the "Select Device" window appears, select the

PIC18F1220 from "Device" and press OK.

(4) Select "Programmer -> Connect".

When connected with the Micom, the display message on
the Output window appears as below. 

(5) Select "File -> Import", select the Work HEX file and open.

(6) Select "Programmer -> Program".

(7) Download is executed and about 5 seconds later, the

"Programming succeeded" message is displayed on the
Output window and the Download process is ended. 

(8) The execution of process (6) is convenient when using the

short-cut icon.

(1) Connect the MEMORY JIG and PC.
(2) Turn on the JIG MAIN POWER SWITCH.
(3) After turn on the PC and MONITOR, execute the

‘Certificate Downloader v1.4’  from the screen.

(1) After open the ‘Certificate Downloader v1.4’, enter

Connection set and set the as same below.
The port settings are determined by each PC's setup.

(2) Select ‘Connection’ and SET connected to RS-232C. 
(3) After clicking "Enter", confirm that "Enter Password:"

appears. 

- 11 -

(4) Click the "OpenFile - Download" button from CP Data

Download, ‘select the Private Key’ appears and click
ENTER.  

(5) After clicking ENTER, the ‘opens Private key' window

appears and select the Private key applied to the SET.
The Private Key file name is on the Label of the Digital
Board.

(6) When the Dialog window appears, click OK and the write

work will begin.

(7) When completed, click ‘CP Data Download: OK’ 

* When ‘CP Data Download: OK’ does not appear, certificate

has not Download correctly.
SET is rebooted and certificate Download work must be
repeated.  

(1) PC with Factory Test Program
(2) VBI Inserter (Norpak TES3) - Guide Data Discharge

Equipment

* In case of without the VBI Inserter(TES3), a VCR may be

used.

(1) In case of with VBI Inserter(TES3): Signal uses Cable input

and set as below.

(2) In case of without VBI Inserter(TES3) : VCR uses Cable

input and set as below.

* Factory Test S/W must be set to "GlinkTo PC Card" ON.

(1) Turn on the TV and run Factory Test Program of PC.
* Program only needs to run once, regardless of set quantity.
(2) Enter the EZ adjust menu by pressing Adjust on the

Service Remote Control (S R/C).

(3) Go to number 1 Gemstar and press Enter.
(4) TV set screen will appear as shown.

(5) Confirm that VBI Test and Serial Test PASS from the

screen.

Input Signal

RS-232C

- 12 -

(1) Confirm that the Cable Card is inserted in the slot.
(2) Enter the EZ adjust menu by pressing the Adjust key on

the Service Remote Control (S R/C).

(3) Go to number 2 Cable Check and press the Right key (

G

) .

(4) Confirm items below.

<Caution>
Each PCB Assy must be checked by Check JIG Set before
assembly.

8. EDID(The Extended Display 

This is the function that enables “Plug and Play".

1) PC, Jig for adjusting DDC. (PC serial to D-sub

Connection equipment)

2) S/W for writing DDC(EDID data write & read)
3) D-Sub cable
4) Jig for HDMI Cable connection

1) Set devices as below and turn on the PC and JIG.
2) Open S/W for writing DDC (EDID data write & read).

(operated in DOS mode)

ADC-Set adjustment to set the black level and the Gain to
optimum.

Service R/C, 801GF(802B, 802F, 802R) or MSPG925FA
Pattern Generator
(720P The Horizontal 100% Color Bar Pattern output will be
possible and the output level will accurately have to be
revised with 0.7±0.1Vp-p)

- Check the connection Component1 to the test Equipment 
1) Select Component1 as the input with 100% Horizontal

Color Bar Pattern(HozTV31Bar) in 480i Mode and
select ‘Normal’ in screen.

2) After receiving signal for at least 1 second, press the

ADJ Key on the Service R/C to enter the ‘Ez-Adjust’ and
select the ‘4. ADC 480i Comp1’. Pressing the Enter key
to adjust with automatic movement.

3) When the adjustment is over, ‘ADC Component1

Success’ is displayed.

4) If the adjustment has errors, ‘ADC Configuration Error’ is

displayed. And error massage (‘Component Not
Connection’ or ‘Change Format to 480i’ or ‘Check
Pattern of device’) is displayed for 1 second.

Name

Descrambler

Check

CableCARD

OOB Path

FDC_SNR

Video Signal

Normal

OK

CableCARD

TM

is inserted.

OK(Lock)

OK(20dB above)

Normal Screen

Defective

Not OK

CableCARD

TM

is removed.

Not OK(Unlock)

Not OK(20dB under)

Black Screen

(No Picture)

PDP TV SET

(or Digital Board)

<Fig. 2>

<Fig. 3> Adjustment Pattern : 480i/1080i 60Hz HozTV31 Bar Pattern