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Origineel bericht door: Richdave ,

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'''FYI - From the 2009 21.5/27 inch service manual'''

'''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

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