 Apple Technician Guide - tim.id.au

2010-08-05
Deep Dive: Vertical/Horizontal Lines
Check Result Action Code
1. Horizontal lines may be related
to a failing RAM module. Verify
if video issue only happens
AFTER the Apple logo and the
spinning wheel has appeared.
2. Start with shift key down
(safe mode) to disable system
extensions. Verify if issue still
happens when booting in safe
mode.
3. Isolate with only one memory
module installed , then with
the other one. Test with
known-good memory. Verify
that issue only happens with
specific RAM module(s).
4. Isolate with one known-good
memory module installed
in one of the memory slots.
Repeat by testing in the other
memory slot with knowngood
memory module. Verify
that issue only happens with
specific memory slot on logic
board.
5. Run Clamshell Service
Diagnostic utility and check
for LCD panel presence. If not
found, reseat the LVDS cable to
the logic board video output. Is
normal video restored?
6. Connect external compatible
DisplayPort display (or
DisplayPort adapter and
display). Verify if correct video
appears on external display.
Yes Issue only happens AFTER
Apple logo and spinning
wheel appears. Go to step 2.
No Issues happens since startup.
Go to step 5.
Yes Go to step 5.
No No video issue when booting
in safe mode. Go to step 3.
Yes Replace affected RAM
module.
No Go to step 4
X02
Yes Replace logic board. M07
No Go to step 5
Yes Issue resolved by reseating
loose LVDS cable..
No Go to step 6
Yes Go to step 7.
No Replace logic board M04
MacBook Pro (15-inch, 2.53 GHz, Mid 2009) Symptom Charts — Display 74