Apple Macbook Pro Aluminum 13-Inch Black Laptop Keyb Technical Guide - Page 39

Check, Result, Action, Corrupt SMC State preventing

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Deep Dive Check 1. Characterize video issue Define whether the issue is a bad image with backlight OR no video issue. Verify whether some image even distorted is visible. 2. Isolate Peripherals as cause Disconnect all peripherals, external devices, and display adapters if present and verify that video is displayed. Result Yes Action Bad image quality, go to step 5 Code No No image seen or image visible with no backlight, go to Step 2 Yes Suspect peripherals as cause. Reconnect one at a time, verifying unit operation at each stage No Go to Step 3 3. Adjust Brightness Power-on unit , attempt to adjust brightness to maximum using brightness (F1/F2) keys and verify that video is displayed. Yes Video displayed - Brightness set to minimum, panel backlight was inadvertently turned off. If backlight returns to low check for stuck F1 key on keyboard. No Go to Step 4 4. Reset SMC Reset SMC and verify that system video is displayed. Yes Corrupt SMC State preventing video. No Go to Step 5 5. Reset PRAM. Yes Invalid or Corrupt PRAM If no action, use external contents affecting video keyboard with same sequence. output Verify that system video is displayed. No Go to step 6 2010-06-15 MacBook (13-inch, Aluminum, Late 2008) Symptom Charts - Startup and Power Issues 39

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MacBook (13-inch, Aluminum, Late 2008) Symptom Charts — Startup and Power Issues
39
2010-06-15
Deep Dive
Check
Result
Action
Code
1.
Characterize video issue
Define whether the issue is a
bad image with backlight OR
no video issue.
Verify whether some image
even distorted is visible.
Yes
Bad image quality, go to step
5
No
No image seen or image
visible with no backlight, go
to Step 2
2.
Isolate Peripherals as cause
Disconnect all peripherals,
external devices, and display
adapters if present and verify
that video is displayed.
Yes
Suspect peripherals as cause.
Reconnect one at a time,
verifying unit operation at
each stage
No
Go to Step 3
3.
Adjust Brightness
Power-on unit , attempt to
adjust brightness to maximum
using brightness (F1/F2)
keys and verify that video is
displayed.
Yes
Video displayed - Brightness
set to minimum, panel
backlight was inadvertently
turned off. If backlight returns
to low check for stuck F1 key
on keyboard.
No
Go to Step 4
4.
Reset SMC
Reset SMC and verify that
system video is displayed.
Yes
Corrupt SMC State preventing
video.
No
Go to Step 5
5.
Reset PRAM.
If no action, use external
keyboard with same sequence.
Verify that system video is
displayed.
Yes
Invalid or Corrupt PRAM
contents affecting video
output
No
Go to step 6