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Screen issues after impact or liquid

Hello All—

I have acquired a damaged MacBook Pro 15" Retina 2015 that actually appears to be fully functional with the exception of the built-in display. Connecting to an external display works fine, and everything boots and runs as you'd expect. I was told that the machine "got wet", but the moisture indicators on at least the lower side of the logic board are clear (haven't pulled board to check the topside). The left side of the case has a slight bend right about where the forwardmost Thunderbolt port is, so I'm wondering if the actual damage was from a fall or if it really did get wet (or both).

Anyway, the screen displays a picture, but it oscillates every couple of seconds between the lowermost couple of inches being scrambled and the entire thing being scrambled, w/ multiple iterations of the desktop stacked vertically. Almost like a vertical sync issue. Pictures below.

Any suggestions on what to look at? If I can get this operational w/o buying a screen OR at least figure out if the problem lies w/ screen or logic board, that'd be great.

Thx,

Fred

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I would still like to know what components to check on the logic board to try to pin down if it is the panel for sure. For this "gimme" system, I don't plan to buy a $400+ panel whether it fixes it or whether it doesn't and I return it. This system took a pretty good shot, enough to bend the case, and supposedly got wet also. So I'm curious about whether the display issue could possibly be related to a logic board component (WLED or fuse or something). Have multimeter, will travel— er, *test*! Going to unaccept the answer because curiously I didn't accept in the first place but moreso because I'm interested in digging a little deeper, if anyone knows how.

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Hi Fred, I can confirm the display is definitely damaged. Replace a lot of the LCD panels for these, and your issue occurs when the damage is along the bottom edge of the screen, under the black border (so no physical crack is visible). When this section is damaged, it will either cause vertical bars to appear or flickering of the screen to occur.

WLED driver and backlight fuse are for the backlight, if these were bad, the screen will not light up, will flicker, or brightness change will not respond. Definitely the display, can bet money on that :)

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Okay, thanks for the confirmation, Reece! FWIW, I was simply mentioning the backlight-related components as an example of when a display problem ain't actually the display. :-) But if it's the panel, I'll see what options I can come up with, likely short of buying a panel for $400+. The machine is basically a "bonus" system that I was given for parts, so I don't want to go spending large sums of money on it just to get it operational again, especially since it has some "bendy" cosmetic damage. So, is there anything that can be repaired along that bottom edge section, or is it panel-and-all replacement?

Thanks again,

Fred

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You would need to replace the LCD panel (it is the bottom of the panel that gets damaged). The easiest way is to replace the whole lid assembly, or you can find someone who can just replace the LCD panel, which will save on cost

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Sounds like a damaged display. I would replace it.

Here's how: MacBook Pro 15" Retina Display Mid 2015 Display Assembly Replacement

Here's the part, if this doesn't fix it, you can return the part:

MacBook Pro 15" Retina (Mid 2015) Display Assembly

MacBook Pro 15" Retina (Mid 2015) Display Assembly Image

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Like I said, I would like to determine if it is actually the display, and likely will not purchase a display panel. If it is indeed the panel and unfixable, I may either use it as a desktop or part it out. Thx.

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If the external monitor is working that pretty well limits where the issue is.

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Most likely limits location to the panel, yes, but not with 100% certainty. For instance, if I had a dark screen that was visible with a flashlight, and also worked on an external display, that might be the backlight fuse— a logic board component. That's why I'm asking for things to look at before concluding it's the display only. I'm hoping that those with component-level knowledge can either confirm it's the display or point me at other ways to isolate, such as with a multimeter.

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Fred Turner will be eternally grateful.
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