Acer P3250 Refresh, Service Manual, Page: 67 / 140

P3150/P3250/P3150 Refresh/P3250 Refresh Confidential
4-5
- Adjust Resync or Frequency/Tracking/H.
Position/V. Position to the inner screen.
Inspection item - Eliminate visul wavy noise by Rsync, Frequency
or Tracking selction.
- Check if there is noise on the screen.
- Horizontal and vertical position of the vedio
should be adjustable to the screen frame.
Criteria - If there is noise on the screen, the product is
considered as faliure product.
- If there is noise on the screen, use auto or
manual “frequency” function or “tracking” func -
tion to adjust the screen.
- The PC mode functionally sure be workable
include support format with frequency and auto
detected functional will be workable.
2. Light Leak
Procedure
- Test equipment: video generator.
- Test signal: analog 1024x768@60Hz
- Test Pattern: gray 1 0 patterns
- Check if the light leaks.
* Light leak on reflective edge, eyecatcher, bond -
wires and exposed metal.
Inspection item - Light leak check.
- Bright blemish (dirty).
Criteria - The bright blemish is unacceptable when it is
more than four under gray 10 pattern.
- Ref. below table
Note: The defect criteria follows TI specification.
3. Blemish (Dark)
Procedure - Test equipment: video generator.
- Test signal: analog 1024x768@60Hz.
- Test Pattern: blue 60
Inspection item - Dark blemish check.(dirty)
Criteria - The bright blemish is unacceptable when it is
Gray 1 0
Blue 60