Specifications

LED Cinema Display (24-inch) Symptom Charts — Display Issues 27
2010-02-08
Deep Dive: Pixel Anomalies
Unlikely cause: logic board, power supply, blower, subwoofer, speakers, camera, microphone
Check Result Action Code
Determine if “defects” are dust/1.
debris on surface of glass panel
or LCD panel.
Yes
Clean glass/LCD panel.
Note: If debris is inside LCD, it
can’t be cleaned, therefore
replace LCD panel.
No Go to step 2.
Determine if bright pixel 2.
defects exceed the acceptable
number. See kBase #HT1721
Yes Replace LCD panel. L08
No LCD meets bright pixel defect
specications. Go to step 3.
Determine if dark pixel defects 3.
exceed the acceptable
number. See kBase #HT1721
Yes Replace LCD panel. L08
No LCD meets dark pixel defect
specications. Go to step 3.
Determine if the combination 4.
of bright/dark pixel defects
exceed the acceptable
number. See kBase #HT1721
Yes Replace LCD panel. L08
No Explain to user that LCD is
within specications for pixel
defects. Do not replace LCD.
Deep Dive: Non-Uniform Brightness
Unlikely cause: logic board, power supply, blower, subwoofer, speakers, camera, microphone
Check Result Action Code
Determine if brightness 1.
uniformity issue is visible after
display has warmed up for
approximately 15 minutes.
Yes Go to step 2.
No Display backlight can take
several minutes to stabilize.
Display user-provided 2.
examples showing brightness
uniformity issue. Determine if
issue appears excessive when
compared to a similar unit.
Yes Go to step 3.
No Explain to user that
LCD appears to meet
specications.
Remove front bezel and 3.
loosen screws securing LCD.
Determine if brightness
uniformity improves.
Yes Inspect for mechanical
interference with screws/
chassis/wires making contact
with back of LCD. Retest
No
Replace LCD panel. L07