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Water Damaged iPhone 6 Plus; Small component broke off

I'm working on a customer's iPhone 6 Plus. My first water damaged phone. I was able to remove the logic board shield where there was noticeable corrosion. I've isolated the problem to a small component. One side of the component was hanging off of the logic board and the other side was still soldered on.

My questions are this: how do I know what kind of component this is? Secondly, since there is no metal on one side of the component, is there any way that I can get this component back on the logic board? Third, would it be safe to micro jumper this connection on the logic board?

Appreciate any help that you can give me. I'm learning. Hopefully I did not bite off more than I can chew. I do have an electrical engineering degree, but no micro soldering experience.

Mike

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Beantwortet! Antwort anzeigen Ich habe das gleiche Problem

Ist dies eine gute Frage?

Ja Nein
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How did it go? I have similar issue with a short in the PP_VCC_MAIN line in a 6plus. The only thing heating is PMIC, have not tried to replece it yet. Would be my first chip rep.

von

Don't replace the PMIC. You'll be sorry if you did. Check the cap near the big wifi chip on the back for a short.

von

I agree. Better not to jump to conclusions that the big IC chip is at fault. Other components connected to it can cause it to be shorted instead without you realising that the IC chip may be not at fault.

von

Thanks for reply! I have not change it yet. And i think I wont, on diodmode with multimeter I've got 22ohms around the PMIC and the WIFI cap, and near the Audio IC I've got don to 3ohms, if i put the probs togheter it reads 2ohms, so its defently near the U0900!

NOW! The thing i found weird, the PP_VCC_MAIN in to audio IC is defently NOT shorted?? The four caps incl C1075 shows no "beeb" and have high resistance to ground? Insteed I've got short in PP1V8_SDRAM, that line shows 12oms. The cap i belived cause the problem was c1025, that showed 3oms. But still i short!

So far I've removed C1033, C1014, C1025 and C1263, they all except C1025 looked bad. I have not replaced them.

So my next guess is the audio IC, cant find a bad cap nerby and i get low readings on nearby caps, you can allso see the burnmarka on the shield ahowing that two lines to the chip gone really hot! See: DEAD, no respons, No power to the battery, possible the U2 ic?

von

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Michael Huie,no. Absolutely no jumper. This would cause a short between VCC main and ground. The part you are missing is reference designator C3222_RF which is a 2.2UF 6.3V 20% capacitor in a 0201 package.

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Thank you so much for your answer. Can you tell me the best way to acquire one of these capacitors? What is the "0201 package"?

von

The package size denotes the physical dimensions of the part. A 0201 package is 0.024" L x 0.012" W (0.60mm x 0.30mm)x0.011" (0.28mm) height. Just checked with Mouser,com and they carry them, most certainly other places will have those as well.

von

Thank you so much for your help!! There is so much to learn!

von

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how do I know what kind of component this is? it is a capacitor. its job is to fine tune some kind of data signal that flows through it.

Secondly, since there is no metal on one side of the component, is there any way that I can get this component back on the logic board? Nope. And you wouldn't want to anyway, it was most likely shorted.

Third, would it be safe to micro jumper this connection on the logic board? No of course not---but can you answer a question for me---where are we getting the idea that this potentially would be okay? there has to be a source since this is such a common thought on here. It is like making a cake and seeing that we are out of sugar---so can we just use garlic?

Because the role of these tiny capacitors is just to fine tune data signals, there is likely to not be any appreciable effect from the loss of one of them. Good job on getting your shields off your board so you can see the whole thing. If there was enough corrosion in this area, then your next step is to test other capacitors to see if there is a short somewhere that you can find. Heat is a good guide as well.

edit--yeah, look at your picture. All those caps with black ends? test to see if they are short---they should not have continuity across them. Ideally, you would replace them all with good ones.

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I just started repairing idevices about 3 weeks ago. I've had to digest a lot over the past few weeks. Micro jumpers are mentioned in every post about damaged components, but no one ever really mentions what is safe to jump and what is not. They just talk about doing it.

Anyways, now that I really think about micro jumping the capacitor, I realize that it is a dumb idea. I'm guessing that the only thing that is safe to jump is a break in continuity on the the logic board.

The iphone does not turn on right now, so there is some sort of power problem. I looked this capacitor up and it looks like it's for the Radio PMIC, which doesn't seem like it's part of the power problem. First things first though...I will replace this component...somehow. This 0201 component is really small though.

Thanks for your help. I will test the caps for continuity.

von

gotcha. Microjumpers is a word that I made up--and you're right, it is all about restoring continuity in a line.

Problems like this one are rarely solvable, but are a great place to start learning board repair. Look for shorted caps by finding ones that have low resistance to ground on both sides. Diode testing on your multimeter is a good way to do this. Once you find a shorted cap, look at the schematic to see what other caps are in that line---start removing them until you relieve the short.

Often the short can be under a chip---like the PMIC. Learning to replace big bga chips is another entire arm of board repair. It is always a fun puzzle, best of luck!

von

you are really a smart guy who are willing to learn, for now i cannot solve the problem for you, but actually i am learning how to replace my IPhone 5s lcd screen.i cannot afford to throw it away.

von

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Michael Huie wird auf ewig dankbar sein.
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