Inspection Procedure - Acer PD726W Service Manual

Inspection Procedure

No Step
1 Reset
1 Frequency
and Track-
ing
2 Boundary
3 Focus
4 HDTV
45
Specification
After final QC Step, please do OSD reset to erase all saved change again and restore the
factory defaults. The following actions will allow you to erase all end-user's settings and
restore the original setting:
1. Please enter the service mode.
2. Choose "Factory Reset" then choose "Yes" and press "Enter" to see if it works.
Eliminate visual
wavy noise by
Rsync, Frequency
or Tracking selec-
tion.
Horz. And Vert.
position of video
should be adjust-
able to be the
screen frame.
The text in the
corner should be
clear after adjust
the focus ring.
No discolor
Procedure
- Test Signal :1280x768@60Hz
- Test Pattern : Line Moire Pattern
- check and see if image
sharpness and focus are
well-performed.
- If not, re-adjust by the following
steps:
(1) Select "Frequency" function
to adjust the total pixel number of
pixel clock in one line period.
(2) Then, select "Tracking" func-
tion and use right or left arrow key
to adjust the vgalue to minimize
video flicker.
- Test Signal : 1280x768@60Hz
- Test Pattern : Boundary Frame
- Adjust Resync or Frequency /
Tracking / H. Position /
V. Position to the inner of the
screen.
- Test Signal : 1280x768@60Hz
- Test Pattern : Text Pattern
- Adjust the center clearly;
meanwhile, one slightly vague
corner in the image is allowed.
- Test Signal : 480P, 720P, 1080i
- Test Pattern : Color Bar
- Equipment: Quantum Data 802B
or CHROMA2327
*Please refer to page 4~7 to enter
Service Mode. Use 480i signal,
color bar pattern to do video
calibration; then, use 576p signal
by 4:3 screen and 1080i signal
by 16:9 screen. If the test result
was in discoloration or flickering,
please return the unit back to the
repair center.
Photo
Chapter 4