iMac (27-inch, Mid 2010) Symptom Charts — Display 54
2010-09-09
5. Shine bright (low heat)
ashlight 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. X03
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.
M04
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 Apple Service
Display Utility to verify the
resolution of issue.
Enter the resulting verication
code into the “Notes” eld
of GSX and return system to
customer if repair is complete
X03
L03