42LG72 (CHASSIS:LA86B) - LG TV Service Manual (repair manual). Page 10

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These instructions are applied to all of the LCD TV, LA86B.

(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

20±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 220V, 60Hz

when adjusting.

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

prior to the adjustments.  

(6) Perform preliminary operation after receiving 100% White

Pattern (06CH). (Or 3. White Pattern status of Ez-Adjust)

(7) White Pattern entry method

1) Enter into Ez-Adjust by pressing the ADJ key on the

adjustment R/C.

2) 100% FULL WHITE PATTERN appears if pressing the

OK (

A

) key after selecting the ‘10.WHITE PATTERN’

with the CH +/- KEY.

* It is possible to heat run the set without a separate
signal generator in this mode.

Caution : Care must be taken as afterimage phenomena
may occur about the black level part of screen If leaving
pause image turned on for more than 20 minutes
(especially inner digital pattern (13 CH), Cross Hatch
Pattern (09CH) with significant black/white contrast).

ADC-set is Gain and Black level setting at Analog to Digital
converter, and compensate the RGB deviation.

(1) Remote control for service
(2) 801GF (802B, 802F, 802R) or MSPG-925FA pattern

generator

- Revolution : 480i, 1080p
- Pattern name : Horizontal 100% Color Bar Pattern 
- Pattern level : 0.7±0.1Vp-p
- Image

(3) Using regulation signal cable

(1) ADC 480i Component1 adjustment

1) Check the Component1 connection condition from the

used device.

2) Apply 480i Mode, Horizontal 100% Color Bar Pattern to

Comp1 port.(MSPG-925FA => Model: 209, Pattern: 65)

3) Set the input to Component1 and select ‘Normal’ as

video.

4) Wait for one second or longer after receiving the signal,

press the ADJ key of the R/C to enter into ‘Ez-Adjust’,
select ‘3. ADC 480i Comp1’, and press the Enter key to
automatically adjust.

5) If it is normally adjusted, the message “ADC

Component1 Success” is displayed.

6) If it is not normally adjusted, the message ‘ADC

Component1 480i Fail’ is displayed. If the component is
not connected, the message Component1 Not
Connected, or if the input format is not 480i, the
message ‘Not Valid Format’, or if there is no input signal,
the message ‘Check Signal Status’ is displayed for one
second.

7) If the adjustment is failed, check the pattern or the

adjustment condition and then readjust

(2) ADC 1080p Component1 / RGB adjustment

1) Check the connection condition of Component1 and

RGB from the device to use.

2) Apply 1080p Mode, 100% Horizontal Color Bar Pattern

to Comp1 and RGB port.

(MSPG-925 Series => model:225 , pattern:65 )

3) Set the input to Component1 and select ‘Normal’ as

video.

4) Wait for one second or longer after receiving the signal,

press the ADJ key of the R/C to enter into ‘Ez-Adjust’,
select '4. ADC 1080p Comp1/RGB', and press the Enter
key to automatically adjust the component1.

5) If it is normally adjusted, the message “ADC

Component1 Success” is displayed, or if not, the
message ‘ADC Component1 1080p Fail’ is displayed.

6) When adjusting the Component1 is ended, it is

automatically switched to the RGB-DTV Mode and the
RGB adjustment is started. If it is normally adjusted, the
message “ADC RGB 1080P Success” is displayed.

7) If it is not normally adjusted, check the pattern or the

adjustment condition, and then readjust. The error
message is same to 6).

8) If the adjustment is ended, press the ADJ key to exit

from the adjustment mode. If the 7) adjustment is ended,
press the ADJ or the Exit of the adjustment R/C to exit
from the adjustment mode.