Sky PDS4250, Service Manual, Page: 24 / 62

6.Adjusting Method
-23-
6-1. Adjusting WHITE BALANCE
1) Apply 5 Step Gray Scale pattern to
Video input terminal
(MIK 7253S PATTERN NO.9)
Fig. 2 5 Step Gray Scale Pattern
2) Check initial data of User Menu ( refer to 5-2 )
3) To enter Service mode, press button
“
up > mute > recall > mute
“
on the remote controller and
select PW171, then check initial data of Service mode( refer to 5-2 ).
4) Attach a sensor of White Balance Meter(CA-100) to 80% of white level on the screen.
5) Adjust White Balance by varying Gain of R,G,
* Gain of R, G, should be adjusted to DP+ 10 ,if beyond these then that is a specification fault
* Coordinate of Color is x=0.270 + 0.005, y=0.300 + 0.005 and the Color Temperature is over 10,000-
degree K.
6) Attach a sensor of White Balance Meter to 40% of white level on the screen
7) Adjust White Balance by varying the values of R,G,
* Values of R,G, should be adjusted to DP + 5 ,if beyond these then that is a specification fault
* Coordinate of Color is x=0.270 + 0.005, y=0.300 + 0.005.
8) Repeat No 4) to No 7) until getting that Coordinate of Color is x=0.270, y=0.300, and then adjust
Sub Contrast to over 100 Cd/m square after attaching a sensor of White Balance Meter to 100% of
white level on the screen.
9) To exit from Service mode, press Menu button on the remote controller.
6-2. POWER ADJUSTMENTS
* Video pattern condition : 100 IRE Full White Pattern
* POWER PCB Adjustments mean that you should set the following 2-type power voltages to the
values which were already adjusted by PDP module (LG Module) maker. Therefore, if there are
some problems in picture after adjusting, you should classify that PDP module as a fault and contact
to PDP module maker.
1. Vsus (SUSTAIN Voltage) : Discharge Sustain Voltage
Measurement equipment : Digital Volt Meter ( DC Volt mode )
Adjusting TP : TP204 (See Fig. 4)
Adjusting Location : RV203 (See Fig. 4)
Optimum Adjusting Voltage : Voltage which is written in Label which is at upper right side of
PDP Module. (Typical Voltage : 190 V - Fig. 3)