5.

Shine bright (low heat)

Yes

LCD panel functional but

 

 

flashlight onto front of LCD.

 

backlight is missing or

 

 

With computer powered ON

 

dim. Remove LCD panel

 

 

verify if a faint image is visible.

 

and inspect and reseat the

 

 

 

 

following cable connections:

 

 

 

 

-Backlight power cable

 

 

 

 

between backlight board and

 

 

 

 

LCD panel.

 

 

 

 

-Vertical sync cable between

 

 

 

 

backlight board and LCD

 

 

 

 

panel.

 

 

 

 

-DC power cable to backlight

 

 

 

 

board and power supply.

 

 

 

 

Replace any damaged cable.

 

 

 

 

Reinstall LCD panel and go to

X03

 

 

 

step 6.

 

 

 

 

 

 

 

 

No

No image nor backlight.

 

 

 

 

Go to step 7.

 

 

 

 

 

 

6.

Power ON system. Verify if

Yes

Issue resolved.

 

 

image is now visible on LCD

 

 

 

 

No

Replace LED backlight board.

M04

 

panel with correct backlight

 

 

Retest. If issue persists, go to

 

 

level.

 

 

 

 

step 7.

 

 

 

 

 

 

 

 

 

 

7.

Inspect and reseat internal

Yes

Issue resolved.

 

 

DisplayPort cable (between

 

 

 

 

No

Replace internal DisplayPort

X03

 

logic board and LCD panel).

 

 

cable.

 

 

Power ON system. Verify if

 

 

 

 

 

 

 

image is visible on built-in LCD

 

If issue persists, replace LCD

L03

 

display.

 

 

 

panel. Run Apple Service

 

 

 

 

 

 

 

 

Display 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

 

 

 

 

 

 

2010-09-09

iMac (27-inch, Mid 2010) Symptom Charts — Display  54

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Image 54
Apple MD094LL/A manual Panel with correct backlight, Logic board and LCD panel, Display