3.

Verify if issue is visible on an

Yes

Issue NOT caused by internal

 

 

external display attached to

 

LCD panel. Go to step 7.

 

 

mini DisplayPort.

 

 

 

 

No

Go to step 4.

 

 

 

 

 

 

 

 

 

4.

Inspect glass panel. Verify if

Yes

Clean glass and/or LCD using

 

 

issue is caused by condensation

 

procedures in Glass Panel

 

 

or contaminants on inside

 

take-apart chapter.

 

 

surface of glass panel.

 

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.

Yes

Replace DisplayPort cable,

X03

 

Disconnect DisplayPort cable

 

vertical sync cable or any

 

 

between LCD display and logic

 

other damaged part/module.

 

 

board, and verify if there is

 

 

 

 

No

Reinstall DisplayPort cable

 

 

damage to cable or connectors.

 

 

 

and vertical sync cable.

 

 

 

 

 

 

Repeat with vertical sync cable

 

Go to step 6.

 

 

 

 

 

 

connected between LCD panel

 

 

 

 

and LED backlight board.

 

 

 

 

 

 

 

 

6.

Verify if issue is still visible after

Yes

Replace LCD panel.

L04

 

reinstalling internal DisplayPort

 

Run Apple Service Display

 

 

cable and vertical sync cable.

 

Utility 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

Yes

Replace video card. Go to

 

 

connector for damage or

 

step 8.

 

 

corrosion then reinstall. Verify if

 

 

 

 

No

Issue likely caused by poor

 

 

issue still occurs.

 

 

 

video card connection.

 

 

 

 

 

 

 

 

 

 

8.

Verify if distorted/blurred

Yes

Replace logic board. Go to

M04

 

image issue is still present.

 

step 9

 

 

 

 

 

 

 

 

No

Issue resolved.

 

 

 

 

 

 

9.

Verify if issue is still present

Yes

Return to step 1 and retest.

 

 

with replacement logic board

 

 

 

 

No

Issue resolved.

 

 

installed.

 

 

 

 

 

 

 

 

 

 

2010-09-09

iMac (27-inch, Mid 2010) Symptom Charts — Display  63

Page 63
Image 63
Apple MD094LL/A manual Yes Replace LCD panel, Reinstalling internal DisplayPort