Apple 2009 iMac - Page 51

iMac (21.5-inch, Late 2009) Symptom Charts — Display 51
2010-11-18
Pixel Anomalies
Unlikely cause: logic board, power supply, hard drive, optical drive, fans, speakers, camera,
microphone
Quick Check
Symptoms Quick Check
Pixel Anomalies
• Dark dot anomalies
• Bright dot anomalies
• Debris on inside surface of
glass panel
• Debris on surface of LCD panel
1. Clean outside surface of glass panel.
2. See kBase #HT1721: About LCD display pixel
anomalies.
Deep Dive
Check Result Action Code
1. Determine if “defects” are dust/
debris on surface of glass panel
or LCD.
Yes Clean glass and/or LCD using
procedures in Glass Panel
take-apart chapter.
No Go to step 2.
2. Determine if bright pixel
defects exceed acceptable
number. See kBase #HT1721:
About LCD display pixel
anomalies.
Yes Replace LCD panel. L08
No LCD panel meets bright pixel
defect specications.
Go to step 3.
3. Determine if dark pixel defects
exceed acceptable number. See
kBase #HT1721: About LCD
display pixel anomalies.
Yes Replace LCD panel. L08
No LCD panel meets dark pixel
defect specications.
Go to step 4.
4. Determine if combination
of bright/dark pixel defects
exceed acceptable number. See
kBase #HT1721: About LCD
display pixel anomalies.
Yes Replace LCD panel. L08
No Explain to user that LCD
panel is operating within
specications for pixel defects.
Do NOT replace LCD panel.