Model A1311 / Mid 2010 / 3.06 & 3.2 GHz Core i3 or 3.6 GHz Core i5 Processor

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iMac.s Internal Display not working, External does.

Internal Display not working, External does.

Hi, I have read a lot about this issue and have done some of the things to rectify this issue but could not resolve this.

First, When I power on the Imac, I can hear chime, Hard drive and fan noise, Three led are lit on the logic board, while fourth remains off. I checked by changing Graphics Card, Inverter Board, Power Supply and lvds connector, and even LED. But still not able to see anything on internal LED while when I connect External monitor, I can use it as a normal mac.

Please help, What can be the issue.

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First couple of troubleshooting questions are: Have you done either a PRAM reset or an SMC reset?

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See if you can discern the desktop with a flashlight.

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this is a very popular problem caused by different issues, one of the following solutions might work for you

lets start with the basics

basically the first thing you might want to do is changing the graphics card and if that doesn't work , you can try the following methods

1. have you wondered if the problem is with the screen and not the cables?

2. also consider that it might be the iMac's display mode that's not configured properly.

3. the problem might lie with the SMC , and if thats the case you, you should read more about it here. its a topic on how to reset your mac's smc http://www.macissues.com/2014/04/11/when...

4. if all those options fail, you might have to replace the motherboard itself and if that also fails..... you will have to take it back to the store and use your warranty

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I had the same problem: Only external video, LED 4 not lid. It was a faulty inductor on the main board. Look:

After HD changed, fuse (wall) tripped, no internal video, but external

Regards.

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kamal kant Mehandiratta will be eternally grateful.
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