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What is causing this grey screen to LCD, still displaying to external?

MacBook 13" A1342 Mid-2010

I have just changed a logic board and I get a grey screen displayed on the LCD.

The MacBook still boots and still displays using a Mini-displayport to HDMI adapter.

I have tested with another lvds cable from another machine that is no longer functional (can't double check the cable) and with a new LCD which has the same issue. I did come across a question that indicated the nVidia chip might have lifted a little and some people have had success reflowing the BGA.

I don't want to do this if it is just a cable or connection problem.

Has anyone come across this before and how can I fix it?

Answered! View the answer I have this problem too

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If the external monitor is working, your video chip is fine. Stick with replacing the cable. Why was the logic board replaced?

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3 Comments:

Someone spilled liquid on it, near the LVDS connector, the IC had chipped somehow. Basically it was dead.

I have a LVDS cable on order but this is just annoying the heck out of me. is it likely to be a bent pin or something?

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Most likely a corroded LVDS cable. Patience.

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Yes it was LVDS. Not corroded but the pins had been slightly damaged.

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