Pular para o conteúdo principal
Ajuda

Versão atual de: mayer ,

Texto:

This may take some trial and error to find the problem. Resetting the SMC - First unplug the unit and press the start button for 5 seconds. Next try a PRAM reset, hit the start button and immediately hold down the Option & Command and P and R keys wait till you hear it tone three times. Next re-seat the RAM, here's how: [guide|990]
 
This failing you will need to open it and examine the diagnostic LEDs:
 
Here's a video on how to open it up:
 
http://www.youtube.com/watch?v=8Xs_1QCyPAg&feature=related
 
You will need suction cups:
You will need suction cups:
 
http://www.ifixit.com/Tools/Heavy-duty-Suction-Cups/IF145-023
 
and a Torx screwdriver set, here's what I use:
 
http://www.ifixit.com/Tools/54-Piece-Bit-Driver-Kit/IF145-022
 
LED Startup Sequence
 
LED #1 = Power available.
 
If no LED is visible:
 
• Verify AC source
 
• Verify known-good AC cable is connected
 
• Verify cable connection between AC inlet and power supply
 
• Verify cable connection between power supply and logic board
 
• Verify power supply
 
LED #1 + LED #2 = Power available, and system is powered on.
 
If second LED is not visible when power button is pressed:
 
• Verify power button connection to logic board
 
• Verify power button functionality
 
• Verify cable connection between power supply and logic board
 
• Verify power supply
 
• Verify logic board
 
LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found.
 
If third LED is not visible after power on:
 
• Verify that MXM video card is seated properly
 
• Verify logic board
 
LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found.
 
If fourth LED is not visible after power on:
 
• Verify cable connections between LCD panel and logic board
 
• Inspect LCD display cables for cable damage
 
• Verify external video functionality, and according to result check the following items:
 
-If external display works then verify/replace LED backlight board
 
-If external display works then verify/replace LCD panel
 
-If external display does not work verify/replace logic board

Status:

open

Postagem original de: mayer ,

Texto:

This may take some trial and error to find the problem.  Resetting the SMC - First unplug the unit and press the start button for 5 seconds.  Next try a PRAM reset, hit the start button and immediately hold down the Option & Command and P and R keys wait till you hear it tone three times.  Next re-seat the RAM, here's how:  [guide|990]

This failing you will need to open it and examine the diagnostic LEDs:

Here's a video on how to open it up:

http://www.youtube.com/watch?v=8Xs_1QCyPAg&feature=related

You will suction cups:

http://www.ifixit.com/Tools/Heavy-duty-Suction-Cups/IF145-023

and a Torx screwdriver set, here's what I use:

http://www.ifixit.com/Tools/54-Piece-Bit-Driver-Kit/IF145-022

LED Startup Sequence

LED #1 = Power available.

If no LED is visible:

• Verify AC source

• Verify known-good AC cable is connected

• Verify cable connection between AC inlet and power supply

• Verify cable connection between power supply and logic board

• Verify power supply

LED #1 + LED #2 = Power available, and system is powered on.

If second LED is not visible when power button is pressed:

• Verify power button connection to logic board

• Verify power button functionality

• Verify cable connection between power supply and logic board

• Verify power supply

• Verify logic board

LED #1 + LED #2 + LED #3 = Power available, system is powered on, and video card found.

If third LED is not visible after power on:

• Verify that MXM video card is seated properly

• Verify logic board

LED #1 + LED #2 + LED #3 + LED #4 = Power available, system is powered on, video card found, and internal LCD found.

If fourth LED is not visible after power on:

• Verify cable connections between LCD panel and logic board

• Inspect LCD display cables for cable damage

• Verify external video functionality, and according to result check the following items:

-If external display works then verify/replace LED backlight board

-If external display works then verify/replace LCD panel

-If external display does not work verify/replace logic board

Status:

open