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 />
No V<strong>id</strong>eo/Bad V<strong>id</strong>eo<br />
Unlikely c<strong>au</strong>se: hard drive, optical drive, top case, battery, power adapter<br />
Quick Check<br />
Symptom Quick Check<br />
Power, but No V<strong>id</strong>eo<br />
• Power<br />
• No v<strong>id</strong>eo<br />
• fan, hard drive spin, or optical<br />
drive reset sound<br />
• sleep LED is on or went on<br />
• light if Caps Lock pressed<br />
Deep Dive<br />
1. Reset SMC.<br />
2. Reset PRAM.<br />
3. If no startup chime, verify with known-good<br />
memory.<br />
4. Verify with external monitor.<br />
5. Press Alt key on startup..<br />
Check Result Action Code<br />
1. Characterize v<strong>id</strong>eo issue<br />
Define whether the issue is a<br />
bad image with backlight OR<br />
no v<strong>id</strong>eo issue.<br />
Verify whether some image<br />
even distorted is visible.<br />
2. Isolate Peripherals as c<strong>au</strong>se<br />
Disconnect all peripherals,<br />
external devices, Express<br />
Card and display adapters if<br />
present and verify that v<strong>id</strong>eo is<br />
displayed.<br />
3. Adjust Brightness<br />
Power-on unit , attempt to<br />
adjust brightness to maximum<br />
using brightness (F1/F2)<br />
keys and verify that v<strong>id</strong>eo is<br />
displayed.<br />
Yes Bad image quality, go to step<br />
5<br />
No No image seen or no<br />
backlight, go to Step 2<br />
Yes Suspect peripherals as c<strong>au</strong>se.<br />
Reconnect one at a <strong>tim</strong>e,<br />
verifying unit operation at<br />
each stage<br />
No Go to Step 3<br />
Yes V<strong>id</strong>eo displayed - Brightness<br />
set to minimum, panel<br />
backlight was inadvertently<br />
turned off. If backlight returns<br />
to low check for stuck F1 key<br />
on keyboard.<br />
No Go to Step 4<br />
MacBook Pro (15-inch, 2.53 GHz, M<strong>id</strong> 2009) Symptom Charts — Startup and Power Issues 42
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