Apple MD094LL/A Manuale Utente

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

 2010-09-09

5.  Shine bright (low heat) 

flashlight onto front of LCD. 

With computer powered ON 

verify if a faint image is visible.

Yes

LCD panel functional but 

backlight is missing or 

dim. Remove LCD panel 

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 

step 6.

No

No image nor backlight.  

Go to step 7.

6.  Power ON system. Verify if 

image is now visible on LCD 

panel with correct backlight 

level.

Yes

Issue resolved. 

No

Replace LED backlight board. 

Retest. If issue persists, go to 

step 7.

7.  Inspect and reseat internal 

DisplayPort cable (between 

logic board and LCD panel). 

Power ON system. Verify if 

image is visible on built-in LCD 

display.

Yes

Issue resolved. 

No

Replace internal DisplayPort 

cable.

If issue persists, 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