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发布于2016年3月,是一款同时拥有着iphone 6s般的硬件规格以及4英寸屏幕体积的iPhone。有深空灰色、银色、金色及玫瑰金色四种配色以及16/64GB容量可选。国行型号为A1723和A1724。

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Liquid damage and possible blown backlight

Alright guys, so I am working on an iPhone SE. It got a little wet, wet enough to the point of when they brought me it, the screen would not work. The rest of the phone you could tell worked (they had the phone turned on!!). So I cleaned the logic board up, took the shields off of course and then reassembled with a new screen and only half of the screen worked. One side of the screen would work fine, the other side had lines going through it and it was a little black. So I got another screen and tried again with the same results. I posted to here about it and they told me I might have gotten a bad batch. So I ordered a more expensive screen that was a lot better and now when I plug ANY screen into it, it stays as a black screen but all of the chips are getting hot.

I am assuming I have a bad back light filter or diode. The only problem is, I can't find anything on this phone. I want to find the back light components, but there isn't much online showing me where to find them. Any one have any advice on where to find them or what could even be the problem?

I am pretty sure about this because I do it every time I test a screen but I will ask anyway! I do not have the metal plate on the back of the screen on, I am only plugging in the screen itself so the digitizer and LCD, and also the home button to see if I could do HOME + Power, but ended up with the same results.

Does the board have to be mounted to the enclosure for it to work? Because I put the board in the enclosure but I do not screw anything down, I just connect the cables to their connectors so I can test. And like I said, the board is getting hot, and when I plug a charger into it, it gets very hot.

Any help will be much appreciated!

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Update (01/05/2017)

@gigabit87898 I don't think this is underfill, this looks differently. The white stuff could be corrosion but I can't get it off! I took a picture of both using my cell phone and the microscope, its not the best picture but does show you what I am talking about. Did you find anything out from the other pictures I sent? Here is the up close microscope shots of them http://imgur.com/gallery/9xBcG. Do you have any suggestion on how to better clean a board? +

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Did you clean the board? Clean it with isopropyl alcohol, and see which chips are getting hot. Please provide a picture so we can see which components are burnt.

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Yes I did clean it with 99% isopropyl alcohol. I have a bunch of pictures, sorry if the quality isn't awesome, my microscope doesn't have a camera yet! here is a link to all of the pictures. http://imgur.com/a/7vA8m

I also found a capacitor that is on the bottom of the front of the board, to the left of the SIM card reader and below the black chip. It is below the 8th capacitor from the left. It has black gunk stuck all over it and looks fried. Not sure what it is for though. Also I have never seen this, but I have white stuff stuck all over part of the board. I am not sure if they are fuses or what they are, but there is a bunch of them, they have a white top and blue on the side. But around a few of them there is white on the logic board itself, not just on the component. And near the white is a capacitor is what it looks like that is bent inwards. All of this is on the front of the board, and the white stuff is to the left of the chip that had the bad capacitor below it, and is to the right side of that chip, second row.

I am not sure if that helps you guys, I can't give you everything because I don't have a board view or anything else for it!

The black stuff is under fill, it's supposed to be there. The white/blue chip is a resistor, but the white stuff on the board is corrosion. Clean the board better, make sure to clean it thoroughly.

@jetlabbelectro youre right; that is not underfill it looks like a very fried/damaged component. To clean it you could give it a ultrasonic cleaning, I suggest you get another damaged SE board to use as a donor to take parts from. The iCloud ones work the best as donors.

@gigabit87898 I have one! Is the white stuff normal too? And do we know where that component went to? Thanks for all of your help by the way!

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@jetlabbelectro

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the component in question here is reference designator C3418_RF which is a 2.2UF 4V x5R ceramic capacitor in a 0201 package. It is part of your Baseband circuitry. Best way of cleaning your board would be with an ultrasonic bath. If you do not have it available follow the direction given above.

@gigabit87898 sure you do....;-) check your email.

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@gigabit87898 I haven't received anything in my email! Are you talking to me about that?

And also, would the capacitor in question have anything to do with the screen not working?

@jetlabbelectro the email comment is directed toward @gigabit87898 The capacitor is for the baseband and not the screen. You have more issues going on with your phone "the board is getting hot, and when I plug a charger into it, it gets very hot." heat indicates a shortcircuit which could be on any power rail. What have you checked on the board thus far? Have you at least replaced the battery and the lightning port assembly?

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wow, how much have you blown on this repair already ?? btw i had a similar issue while repairing my old iphone 5 (replacing battery and ribbon cable for volume) there were lines / strings vertical which dissapeared after screwing in the board and pressing it a bit. don't ask me why. was afraid i've blown the screen but the problem went away. it happened to me actually twice, with the lines on the screen

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I don't think it was me at all that did all of this. They brought me the phone on, and they had it charging and turned on for days. Kind of hard to break it when they bring it to you broke already with liquid damage and it turned on. Just about anything could be shorted and the phone gets extremely hot. So I'm guessing it has a bunch of problems. Not sure why the backlight circuit would be bad, I did not unplug the LCD while the battery was on. And I had it all screwed down once because I thought that it was the problem and the issue was still there, and long screw damage isn't a option I wouldn't think because the screws went back in the right spots.

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