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Model A1502 / 2.4, 2.6, or 2.8 GHz dual-core Intel processor / Released October 2013

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No backlight but LCD is ok

Hello,

I have no backlight after battery replacement.

Ext display works and internal display is detected in macOS.

Logic Board is 820-3536-A

Do anybody know which voltages are aspected on the backlight pins 1, 8 and 28-30 (Display connector)?

I have 52V at Pin1. That seems for me a little bit high?

Any hints/ideas?

Thanks

Answered! View the answer I have this problem too

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Hi @sk8erdeluxe

Have you tried reseating the connector for the display?

Iv seen this sort of thing many times and that’s all it was,might be a bit more complicated but it worth a shot:-)

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Not yet.

I don't have the equipment at home.

But I can reseating it on monday in office.

But is there a way to be sure that it is the connector?

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@sk8erdeluxe

Unfortunately there now way to be sure without measuring voltages in the connector

However it would be the most likely of all the possibilities:-)

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Habe das Problem gelöst.

Musst das Display Kabel austauschen.

Dieses war defekt.

Vielen Dank für die Unterstützung!

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Based on the information provided, it seems that you are experiencing a backlight issue on your MacBook after replacing the battery. Here are a few suggestions that you could try to troubleshoot the issue:

  1. Check the backlight fuse: The backlight fuse is responsible for supplying power to the backlight circuit. It's possible that the fuse may have been damaged during the battery replacement process. Try checking the fuse with a multimeter to ensure that it is still functioning properly.
  2. Check the backlight cable: It's possible that the backlight cable may have been damaged or not properly connected during the battery replacement. Try disconnecting and reconnecting the cable to ensure that it is properly seated.
  3. Check the voltage on the backlight pins: According to the schematic for the 820-3536-A logic board, pins 1, 8, and 28-30 on the display connector should have a voltage of around 12V. A voltage of 52V on pin 1 seems high and could indicate a problem with the backlight circuit. Try checking the voltage on the other pins to see if they are within the expected range.
  4. Contact Apple or a repair professional: If you are not comfortable performing the above steps, it may be best to contact Apple or a repair professional for further assistance. They may be able to provide additional troubleshooting steps or arrange for a repair if necessary.

I hope these suggestions help resolve the backlight issue on your MacBook. Good luck with your repair efforts!

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1 Comment:

1. I checked the backlight fuse. It's ok

2. The cable looks fine and i tried several times disconnecting and connecting again. Nothing changed.

3. Pin 1 has 51,95V, Pin 8 has 1,46V and Pin 28-30 has 5,12V. I think the other voltages are ok (8, 28-30) but this 52V are strange on pin 1.

4. Maybe that is the last help

I think I have to go deeper into the backlight circuit

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Manuel Schmidberger will be eternally grateful.
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