Справочник Пользователя для Apple MD094LL/A

iMac (27-inch, Mid 2010) Symptom Charts — Display 

 2010-09-09

3.  Verify if issue is visible on an 

external display attached to 

mini DisplayPort.

Yes

Issue NOT caused by internal 

LCD panel. Go to step 7.

No

Go to step 4.

4.  Inspect glass panel. Verify if 

issue is caused by condensation 

or contaminants on inside 

surface of glass panel.

Yes

Clean glass and/or LCD using 

procedures in Glass Panel 

take-apart chapter.

Identify possible sources 

of contamination (nearby 

cigarette/cooking smoke, 

heavy airborne dust, etc.) 

to prevent recurrence. 

Condensation should 

dissipate after computer has 

been running a few hours.

No

Go to step 5.

5.  Remove glass and LCD panel. 

Disconnect DisplayPort cable 

between LCD display and logic 

board, and verify if there is 

damage to cable or connectors.  

 

Repeat with vertical sync cable 

connected between LCD panel 

and LED backlight board.

Yes

Replace DisplayPort cable, 

vertical sync cable or any 

other damaged part/module.

No

Reinstall DisplayPort cable 

and vertical sync cable. 

Go to step 6.

6.  Verify if issue is still visible after 

reinstalling internal DisplayPort 

cable and vertical sync cable.

Yes

Replace LCD panel.  

Run 

 to verify the resolution 

of issue.  

Enter the resulting verification 

code into the “Notes” field 

of GSX and return system to 

customer if repair is complete

No

Issue resolved. 

7.  Remove video card, inspect 

connector for damage or 

corrosion then reinstall. Verify if 

issue still occurs.

Yes

Replace video card. Go to 

step 8.

No

Issue likely caused by poor 

video card connection.

8.  Verify if distorted/blurred 

image issue is still present.

Yes

Replace logic board. Go to 

step 9

No

Issue resolved. 

9.  Verify if issue is still present 

with replacement logic board 

installed.

Yes

Return to step 1 and retest.

No

Issue resolved.