Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 76

Noise / Unstable Flickering, Quick Check, Symptom, Check, Result, Action

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2010-06-15 4. Swap memory with known- Yes good memory to determine if video issue is ram related.. No 5. Inspect LVDS connectors and Yes cable under magnification for pinched cables and damaged or bent pins. Do any of the connections appear to be defective? No 6. Substitute a known-good Yes display clamshell to test logic board video output. Is No backlight and display text back to normal? Reseat or replace defective X01 memory Go to step 5 Defective LVDS cable. Replace display assembly. Defective LVDS connector on logic board. Replace logic M25 board. If connections are OK and secure and the display is still blank, go to step 6. Replace display assembly. L09 Poor or no backlight LED M25 Driver power at logic board. Replace logic board. Noise / Unstable Flickering Unlikely cause: power adapter, battery, speakers, optical drive, hard drive, fan, microphone, top case, Quick Check Symptom Noise / Unstable Flickering • Image flicker • Audible noise Quick Check 1. Verify known-good source sound file not causing speaker distortion. Deep Dive Check 1. Verify if user's issue is due to video flickering coming from display. Result Yes No Action Suspected flickering issue, go to step 2. Audible noise issue, go to step 5. Code MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Display 76

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MacBook (13-inch, Aluminum, Late 2008) Symptom Charts — Display
76
2010-06-15
4.
Swap memory with known-
good memory to determine if
video issue is ram related..
Yes
Reseat or replace defective
memory
X01
No
Go to step 5
5.
Inspect LVDS connectors and
cable under magnification for
pinched cables and damaged
or bent pins. Do any of the
connections appear to be
defective?
Yes
Defective LVDS cable. Replace
display assembly.
Defective LVDS connector
on logic board. Replace logic
board.
M25
No
If connections are OK and
secure and the display is still
blank, go to step 6.
6.
Substitute a known-good
display clamshell to test
logic board video output.
Is
backlight and display text back
to normal?
Yes
Replace display assembly.
L09
No
Poor or no backlight LED
Driver power at logic board.
Replace logic board.
M25
Noise / Unstable Flickering
Unlikely cause:
power adapter, battery, speakers, optical drive, hard drive, fan, microphone, top
case,
Quick Check
Symptom
Quick Check
Noise / Unstable Flickering
•
Image flicker
•
Audible noise
1.
Verify known-good source sound file not causing
speaker distortion.
Deep Dive
Check
Result
Action
Code
1.
Verify if user’s issue is due to
video flickering coming from
display.
Yes
Suspected flickering issue, go
to step 2.
No
Audible noise issue, go to
step 5.