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MacBook 2015 - The screen is flickering with horizontal lines

Hello everyone!

I have an issue (see below) on the screen if anyone could help me with the solution or at least with the diagnostic – I thank you in advance!

MacBook (Retina, 12-inch, Early 2015)

Processor 1,2 GHz Dual-Core Intel Core M

Memory 8 GB 1600 MHz DDR3

Graphics Intel HD Graphics 5300 1536 MB

Model A1534

Issue:

The screen is flickering with horizontal lines.

On the black appears blue Lines and on the white appers yellow lines (check attached photos).

The issue occurs even using the power outlet or using the battery.

Actions to try to fix:

·      PRAM and SMC reset (several times);

·      Diagnostic mode does not show any problem;

·      macOS reinstallation.

Findings:

·      In safe mode the issue does not occurs (Why?);

·      If a second display (VGA) or TV (HDMI) is plugged (using the single USB-C port) the issue does not occurs too (Why?).

Any tips will be welcome.

Thank you!!!

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답변 2개

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가장 유용함 가장 최근 가장 오래된
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Solved!

Thanks to mxmln23 on that link:

https://discussions.apple.com/thread/251...

The solution is to use a HDMI Dummy Plug, i. e., a display emulator that cost some bucks.

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You’ll need to do one test here to nail this down, using an external monitor via the the USB-C port in mirror mode. Then when the condition is present does the external display also see these artifacts?

I’m suspecting they are not present which points to the internal displays logic. The fact when you are running in Safe mode also suggests the T-CON logic within the display can’t support the higher scan rate when the OS fully loads.

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Hi Dan,

I've done the test and the MacBook screen neither the VGA monitor present the condition, i. e., the flicker lines.

Could you please explain a little bit more about the T-CON.

Is it possible to lower down the scan rate? (Even using terminal command or third party app)

Thanks

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@whmu - The T-CON is the part which drives the LCD panel of the display within the lid assembly. Basically it converts the Logic board signals to what the LCD display needs to present the image to you in conjunction with the backlight.

Sorry I don't know of any way to over-ride the scan rate the OS wants to use with the internal display. You really only have the Display preference settings. If you have an external display you can often set the scan (resolution) within it. I often do that with my 32" display.

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