Tatung VL5A9DA, Service Manual

Page: 22 / 89

22
V. THE PANEL LUMINANCE WAS DOWN
Use white pattern and resolution 1024x768 @ 60Hz , CHROMA 7120 measured the center of panel
Set Contrast, brightness =maximal, RGB= 50
Quit from OSD-screen, measured Y(luminance)
With chroma 7120, check Y= 210±10 CD/M2 ?
Adjust VR201 until maximal, measured Y =
210±10 cd/m2 ?
NG
NG
If the Y less than 160 cd/m2 (after the VR201=
MAX, contrast, brightness = max) then change the
LAMP of panel
If Y can reach
•
180 cd/m2 that means
The lamp still working well, so we just re-do the
white-balance process
As following procedure
OK
Use white-pattern, press MENU button along
with AC power-plug in ( you will in factory
mode) The OSD-menu will be at left-top of
screen,
press AUTO button to automatically adjust
blacklevel value, you will see the sign PASS ,if
FAIL , manual adjust the blacklevel until value 43 !
Set contrast, brightness to max, and turn the VR201
to max , wait for 20 minutes until the luminance Y
stable
The Y should be larger than 200 cd/m2
(for panel which already use for a year, the Y
luminance might be a little down, around 180
cd/m2, there is acceptable too)
Follow this manual page 7 item 4-2 method to
more detail procedure for do a white-balance
adjust
OK