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Okay, seeing if i can get some advice... so been having these issues with my MacBook Pro Retina mid 2015 inch with the display flashing, going blank the coming back on, then keeps going through that again. Seeing what is most likely to cause is and what i can do...
Screen
Display cables
Or logic board issues
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!st, Make a back-Up just in case of the worst, I think it can be a sign of the beginning of a failing screen....How long has this been going on for? Does this happen when the screen is open at all angles? Open up the laptop, have a clean up of the display connection for good measure, check the LVDS cable for any wear or damage, lets see if that helped in any way. IF the screen 'dies' it can be a failing backlight circuit issue or a faulty display cable, but hopefully not the screen. @danj What's your opinion?
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Okay, just some additional information the external display does work perfectly with hdmi and some history the display i pulled off my other MBP, same model and all that, but that machine stopped working due to some spilled liquid. The MBP i have now i brought off eBay, which had a cracked screen, but didn't have these issues with that display. So after i changed the display, it worked as normal few atleast afew weeks, then these issues happened
@mrdjsilva Take note that 2013/14 A1398 MBP's use a different technology where as the 2015 is an updated version 3.0 > 3.1, they are not compatible, are you sure the screen is from the same year model? Otherwise they will not function correctly. Did the liquid spill get onto the display anywhere as it may have gotten into the mechanics and over time the after effects are happening?
Both MBPs are mid-2015 models, as far as i know the liquid only got through the keyboard but everything was kept off until it was completely dry, not too sure it got inside the display parts but was left over a month or two before i try turning back on and the other mbp was just dead then but i reused the screen from that and when swapping other i didnt notice any corrosion or anything like that on the connectors or anything like that
@mrdjsilva If the MBP was closed then maybe the moisture has evaporated into the lower part of the screen behind the rubber surround where the T-Con board is located. This would cause all sorts of issues. @danj will get to this question later, see what he has to say on it. In the meantime it maybe worth a try running diagnostics (Connect the charger, Power Up + D key), I doubt it will pick up on anything but lets see if it reports something with graphics. Is this a dual graphic model with Intel & AMD graphics?.
@mrdjsilva - sound like you had damage into both the display and the logic board. Here the logic board got wet and due to what was spilled left a deposit of junk which has shorted out the displays power logic just enough to cause it to cycle on and off.
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@mrdjsilva - It's time to fully remove the logic board locate the spills damage and carefully clean what you can off. Often times one need to replace components as they could have been damaged by the spill either directly or via electrolysis as the power try's running down the created pathway the spill offers. While turning off the system is assumed to prevent the risk there is still active logic on your logic board between being in Sleep Mode and even with the battery connected. Which is why you must disconnect it and to slow the corrosion keep the system as cool as possible, just don't freeze it! Until you can take it apart to properly clean the internals. A minor splash is less of a risk than a drenching.
Follow this guide MacBook Pro 15" Retina Display Mid 2015 Logic Board Replacement before cleaning the area take a couple of good pictures so we can see things and then again afterwards. The first of the general area of the board so we can identify it and then a good in focus one of the damage. Blurred and poorly lit pics won't help us.
@mrdjsilva - Nothing visible within either the display cable or its connection. A fuse wouldn't be sporadic in failing other that a cold solder joint or corrosion effecting things. I don't see any of the liquid markers red on this side. What does the other side show?
I do see a messed up Keyboard ZIF latch
And what it should look like
@mrdjsilva - Sorry it does look like something spilled and has corroded a few chips. Let's get a tighter picture of this area to be sure as it's a bit fuzzy
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We are told that the board is from another unit purchased from eBay that had a cracked screen. The issue is most likely the display assembly that was from the water damaged unit and swapped over to the new board was also affected, causing the cut outs from within the displays components. The only real way to test this is to get another known working display assembly to test.
@livfe - Yes I got that but I don't think that's the system in question
Sys-A had a display issue took Sys-B's display off to test with Sys-A. Sys-B was wet? Bought Sys-C with cracked screen transferred screen (Sys-A or Sys-B??) to it as it likely had a better board.
So... if the logic board of Sys-B was wet? Then the logic board is the focus. If that's the system we are seeing the problem with.
Let us wait for @mrdjsilva to confirm clearly what he has toyed with. 2 or 3 units. Otherwise this becomes a confusing mess more.
Sorry for the late reply, my bad, @livfe and @danj.
So there are only two systems the one that got wet and the one from eBay that originally had a cracked screen other then the screen being cracked it wasnt cutting out.
The unit that did get wet has been dried out for a few months now, but I removed its display had a look at it didnt notice any damanged to the connectors but it did get a clean either way. So I moved it to the one from eBay (that had the cracked screen).
Initially the ebay mbp after the screen swap, everything seemed to work fine for like a week or two, then it started to do what you see in the video and sometimes it just runs normally but eventually it will cut out so im leaning towards the display cable or the display, not really looking at the logic board anymore since runs normally and the external display works
@mrdjsilva - let's clarify the issue from the vid you have a backlight failure not a video failure which is why the external didn't encounter the issue. The display has four data flows via the ribbon cables the two primary are related to the video feed to the LCD and the third power to light up the LCD (3 cables). Then you have the SameTime camera and the diagnostic sensors in the last.
The source of the power for the Backlight is the issue here. As you aren't touching the lid the ribbon cable is not likely if the cable is kinked or damaged then that would more likely effected one of the three strings of the Backlight which is not what I see here having a stage light appearance.
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@mrdjsilva since you have already changed the logic board check the backlight voltages on pin 1 on the display connector. In your case, since it is intermittent, you will most likely see the voltages change in sequence with your display turning on and off. If backlight is 45V or more there is no load on the backlight circuit. Use a known good screen and check the cable connector ends. If backlight is 25V-40V the boost circuit is working. Check the connector, cable, and LCD.
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