Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
Apple Technician Guide - tim.id.au
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2010-08-05<br />
6. Verify LCD v<strong>id</strong>eo works with a<br />
known-good display assembly.<br />
Backlight Issue / No Backlight<br />
Yes Replace display assembly. L03<br />
No Go to No V<strong>id</strong>eo symptom<br />
code flow.<br />
Unlikely c<strong>au</strong>se: Power adapter, battery, speaker, ODD/HDD, fan microphone, top case<br />
Quick Check<br />
Symptom Quick Check<br />
Backlight Issue / No Backlight<br />
• Display not illuminated<br />
• Flashing, unstable or non<br />
uniform background lighting<br />
• Poor backlight at some or all<br />
settings<br />
Deep Dive<br />
Check that brightness setting is above minimum.<br />
Check Result Action Code<br />
1. Connect external display, clear<br />
PRAM to set brightness to<br />
def<strong>au</strong>lt level and verify if Color<br />
LCD is listed in the System<br />
Profiler’s Graphics/Displays<br />
device tree.<br />
2. Unplug and reseat the LVDS<br />
cable at the logic board.<br />
Repeat verification in System<br />
Profiler.<br />
3. Darken room and verify<br />
backlight by detecting if any<br />
glow is emitted from the<br />
display<br />
4. Swap memory with knowngood<br />
memory to determine if<br />
v<strong>id</strong>eo issue is ram related..<br />
Yes Display panel detected by<br />
system. Go to step 3.<br />
No Go to step 2.<br />
Yes Display panel detected by<br />
system. Go to step 3.<br />
No Go to step 4.<br />
Yes Backlight operating. Go to<br />
step 5.<br />
No Go to step 4.<br />
Yes Reseat or replace defective<br />
memory<br />
No Go to step 5<br />
X01<br />
MacBook Pro (15-inch, 2.53 GHz, M<strong>id</strong> 2009) Symptom Charts — Display 78
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