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Powers on, no chime, screen lights up but no picture.

Hi, I recently replaced the MagSafe board on this model, because the old one didn't charge. After doing this it now charges and can be turned on - i can hear the CD-drive turning on. However it doesn't boot properly; there is no chime, and though the screen lights up no picture is showing. I suspect the lvds cable is broken, but could it be anything else? Is there a way to test it?

I also tried connecting an external screen an nothing happend.

Thank you.

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Take a look on here https://support.apple.com/en-us/HT204325 and see if it might help. also try a separate display

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Doesn't sound like a LVDS cable issue. Try disconnecting it does the system start up correctly then? If not then the issue is something else.

Can you give us some background information here. Did you get the system wet, banged or dropped?

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No, none of the above. The Mac belongs to a friend of mine, so I don't know how it broke in the first place. But she has told me that it got progressively harder to make it to charge until it stopped completely.

It looks like it has been dropped (the plastic is broken over the charging socket). But as I understand it there has been no problems with the display prior to my 'fix' of the magsafe. Also the damage to the plastic is an old one.

I did consider the display itself to be the problem, but as there was no problems with it before and I have not dropped it, gotten it wet or the like i didn't think it would be broken.

The thing that concerns me the most is the missing chime when I power it on. It seems to me that i should boot up normally regardless of the screen being connected...?

From the guide that I followed I learned that the LVDS cable is very fragile but I wasn't to careful removing it. This leaves me to think that I might have bend it or otherwise damaged it.

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I have tried taking it apart and put it back together again, SMC reset, disconnecting the battery for a while and double checked everything that I've touched - no luck.

I have also (in a particularly frustating momement) ordered a new LVDS-caple, hoping that this would be enough to fix it.

Thank you again.

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I do think you have other issues here. I won't be so quick at replacing the LVDS cable. If you disconnect the internal display (LVDS cable) the system should still start up (getting the bong). If that doesn't happen you have other problems.

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I thought so too. I just don't know what more it could be.. The logic board maybe..?

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Did you use proper ESD protection? It doesn't take much to kill a logic board.

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Okay, so i've been trying some different stuff now. (including everything on the link from Oldturkey)

And here's where I'm at: MacBook powers on and boots up no problem. I connected it to an external screen and everything is as it should be, picture on and desktop is there with all the files and so on.

The only problem is that the LCD screen on the MacBook itself only shows a solid white screen. It has no picture but lights up.

I changed the LVDS cable without any effect. I changed the Magsafe board back to the orignal and back again just to see if this could somehow be the problem, but with no luck.

But since it powers on and boots up without a problem using the external monitor, I don't see how the logic board could be faulty.

Any suggestions? The socket into which the LVDS-cables connects on the logic board is a bit worn from my 'repairs', but doesn't seem to be broken.

Thank you for your help.

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You could have a damaged connector on the logic board, or the display its self is bad. The fact you see a white screen just tells us the backlight is working, but the data signal is not getting through.

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