Screen is black but computer on

Question

iMac Intel 20" EMC 2133 and 2210

Model A1224 / Mid 2007 and Early 2008 / 2, 2.4, or 2.66 GHz Core 2 Duo processor

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dran69 @dran69

Rep: 11

Gepost: 14 feb. 2013

Opties

Screen is black but computer on

OK now 2nd problem.

When I start the computer the scree is black.

I've plugged a 2nd screen and it's black as well so I opened the Imac again and I've got the 3 LED's on but not the 4th one.

I've checked all the answers i could find on the ifit website but Im' not sure if thisis the logic board or the video card?

I don't think it's the inverter because I would have the external screen working.

If it's the logic board it's dead but if it's the video card maybe I could find one somewhere but how to be sure??

Thank you for your help

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ok thank you, is there a way to test the inverter?

But if it was the LCD or the inverter I should have the external screen working?

14 feb. 2013 door dran69

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ok thank you, is there a way to test the inverter?

But if it was the LCD or the inverter I should have the external screen working? — dran69

mayer @mayer Rep: 685,2k MacHale Enterprises 3,4k 1,1k 2,6k · Answer 1 · 2013-02-14T10:11:56-07:00

LED #1

Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will remain ON whenever the iMac is connected to a working AC power source. The LED will remain on even when the computer has been shut down or put to sleep. The LED will turn off only if the AC power source is disconnected or the power supply is faulty.

LED #2

Indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

LED #3

Indicates that the computer and the video card are communicating. This LED will be ON when the computer is communicating properly with the video card. If LEDs 1 and 2 are ON and you heard the startup sound, but LED 3 is OFF, then the video card might be installed incorrectly or need replacement.

LED #4

Indicates that the computer and the LCD display panel are communicating. This LED will be ON when the computer is turned on and video signal is being generated. If the LED is ON and there is no image on the LCD display panel, the LCD display panel or inverter might be installed incorrectly or need replacement.