LG DI-28Z12, Service Manual

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SC (Vertical “S” Correction)

Adjust so that all distance between each horizontal lines are
to be the same. 

EW (Horizontal Width)

Adjust so that digital circle pattern looks like exact circle.

EP (East-west Parabolar)

Adjust so that middle portion of the outemost left and right
vertical paralled with vertical lines of the picture tube.

EC (East-west Coner)

Adjust so that the vertical line at every 4 corners of the
screen looks like parallel with the vertical lines of the picture
tube.

ET (East-west Trapezium)

Adjust to make the length of top horizontal line same with it
of the bottom horizontal line.

Position of Blanking

1) Selection to the Mode of 4:3
2) Adjust the blanking width control (VR1701) for the same

left and right side of the picture tube.

:

Screen & White Balance (W/B) Adjustment

NOTE : This adjustment should be preformed after screen 

voltage adjustment.

1)  Turn the TV set to receive white pattern of PAL standard

signal.

2) Adjust contrast, Brightness for 45

!

1ft-L at the center area of

screen.

3) Press Yellow button after SVC Mode on remote controller

then you can find "RG---/GG---/BG---" OSD around middle-
left of screen.

4) Set the "GG---" to "GG031".
5) Press CH (UP/DOWN) button you can find "RG---"/"BG---"

OSD around middle-left of screen.

6) Adjust volume up or down button in each status of "RG---

"/"BG---" for X=281

!

8, Y=288

!

8 with color analyzer

Table 1 : White Balance initial data

NOTE : "* " marked items don't need adjust.

:

Deflection Data Adjustment

NOTE: To enter SVC mode, press "SVC" button on the Remote

control or "OK" button on both TV set and the Remote
control.

1. Deflection Adjustment Flow

1)  At deflection adjustment mode, select FUBK signal.

And then, deflection data adjustment OSD displays and at
the left top of its auto detected field frequency and deflection
adjustment mode are displayed.

2)  Press "Yellow" button and at deflection adjustment mode

(press "

DE

/

FG

" button) adjust with 50Hz 16:9 mode and

the other mode data are stored automatically. After finishing
adjustment at 50Hz 16:9 mode and check the adjusted data
of different mode.

3) Check the adjusted data changing 50Hz ZOOM1, ZOOM2

and 4:3 mode by pressing "ARC" button and if errors,
readjust at each mode.

Adjustment at 50Hz Wide mode

Item

RG

GG

BG

YD

PK

Range of Change

0~63

0~63

0~63

0~63

0~63

Initial Data

31

31

31

*   03

*   05

Adjustment

R-Drive

G-Drive

B-Drive

Y-Delay

Peak White Limit

Test Point 

: Observe Display

Adjust

: Screen Control of FBT

R, G, B Drive level (For SVC Mode)

16:9, 4:3

ZOOM1

ZOOM2

ZOOM1

16:9, 4:3 
ZOOM2

Top

Bottom

Vertical Size

[

Deflection Adjustment Flowchart

Enter SVC Mode

: Press MENU button 2 times

: Press MENU button twice

Adjust deflection data, 50Hz wide mode 

Press ARC button

Adjust position of blanking

(50Hz 4:3 Mode)

Adjust deflection data

(50Hz ZOOM1, 4:3 mode)

Swap into AV mode

Return to TV mode

Adjust deflection data

(60Hz 16:9, ZOOM1, ZOOM2, 4:3 mode)