26LC7D (CHASSIS:LB73A) - LG TV Service Manual (repair manual). Page 9

- 9 -

These instructions are applied to all of the 26" LCD TV,
LB73A Chassis

(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 220V~,

60Hz when adjusting.

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

prior to the adjustments.  

* Perform preliminary operation after receiving White Pattern.
* White Pattern entry method

- Turn the power on.
- 100% FULL WHITE PATTERN appears if pressing the

Power on key of adjustment remote control.

* Set is activated HEAT RUN without signal generator in this

mode.

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

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

‘program icon’.

(5) End after confirming.

MST3362M-Set adjustment to set the black level and the Gain
of optimum with an automatic movement from the analog =>
digital converter.

Service R/C, MSPG-925 Pattern Generator
(480i, 1080i 60Hz Color Bar Pattern output will be possible
and the output level will accurately have to be revised with
0.7±0.1V

P-P

)

1) Select Component1 as the input with Color Bar Pattern

in 480i 60Hz mode and select ‘Component1’ on 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 ‘1. ADC 480i Comp1’. Pressing the Vol+
Key to adjust the component1.  

3) When the adjustment is over, 'Component1 Adjustment

OK’ is displayed. If the adjustment has errors,
'Component1 Adjustment Failed! Try Again!’ is
displayed.

4) Readjust after confirming the case Pattern or adjustment

condition where the adjustment had errors. 

5) After adjustment is complete, exit the adjustment mode

by pressing the ADJ KEY.

1) Select Component2, RGB-DTV as the input with Color

Bar Pattern in 1080i 60Hz mode and select
‘Component2’ on 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 ‘2. ADC 1080i Comp2/RGB’. Pressing
the Vol+ Key to adjust the component2.  

3) When the adjustment is over, 'Component2 Adjustment

OK’ is displayed. If the adjustment has errors,
'Component2 Adjustment Failed! Try Again!’ is
displayed. and If the adjustment has errors, 'RGB
Adjustment Failed! Try Again!’ is displayed.

4) Readjust after confirming the case Pattern or adjustment

condition where the adjustment had errors. 

5) After adjustment is complete, exit the adjustment mode

by pressing the ADJ KEY.

This is a adjustment to reduce the color difference of video
signal Main/Sub Display.

Service R/C, MSPG-925 Pattern Generator.

LCD TV SET

<Fig. 1>  Connection Diagram of CPLD Download

(Fig. 3) Adjust Pattern :100% 8 Color Bar Pattern