J4200 - Pin 37 (PP1V8_LCM_CONN) Reading 0.048V - Any suggestions?

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iPhone 6s

2015年9月25日にAppleから発売されたiPhone 6Sの修理情報とガイドです。モデル A1688、A1633。

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Aaron @aaron67442

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投稿日: 2019年2月6日

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J4200 - Pin 37 (PP1V8_LCM_CONN) Reading 0.048V - Any suggestions?

I have a water damaged iPhone 6S, I replaced the J4200 connector because there was heavy corrosion. There is a short associated with pin 37 (PP1V8_LCM_CONN) I am getting a reading of .048V in diode mode, I have replaced the caps and filter but no such luck, the short remains. PMIC is heating up, but there was no corroson in that area so I have a hard time thinking that there is a short under there, also CPU is heating up, heating initiates right around a PP1V8 pin. I am stumped! I have visually inspected and poked around the caps on PP1v8…. Any suggestions would be appreciated! FYI, the phone connects to itunes when placed in DFU mode.

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Minho @refectio

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投稿日: 2019年2月7日

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PP1V8_LCM_CONN is driven by PP1V8 via the FL4205 filter. If you have already removed and replaced FL4205C4205/C4206 and the short remains, that means the short is on PP1V8 and that would explain why the CPU and PMIC are heating up.

You will need to go short hunting on PP1V8. Look at all the caps and IC’s that are powered by that line and look for visual clues. If nothing is noticeable, apply freeze spray to see what heats up first. Apply the spray, power up the device and focus on one section of the board that has PP1V8 on it. Then go to another section and repeat.

Eventually you should find it but if the shorted component is tiny or hidden by the shield ribbing, you may have to start removing components one at a time.

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Hi Minho, thanks for the response! I have been doing all of the above less removing chips. I don't recall their being too many chips with PP1V8 running through but I am not sure about that, I'll have to check again. An interesting new find is that I plugged the screen into it and found it to be defective, leading me to believe it took a hit at some point too. I also found that that the back light lights up but there is no image, any thought on that? maybe related. Lastly, I have been using ZXW, perhaps I should cross check with some schematics to make sure the quoted components on ZXW are correct, have you ever found ZXW to quote wrong components? I am new to ZXW, I had been using schematics only. Considering it connects to itunes and takes a charge I feel I should not give up quite yet... I was hoping this was going to be a short and sweet job... Should knocked on wood.

Aaron さんによる2019年2月7日

First of all, this is a water damaged phone and you will be playing whack-a-mole with issues for days on end (unless it's a really simple failure...which this one is not). This should be a data recovery only project. There's nothing wrong with learning though so invest your time wisely.

ZXW is very reliable although it does have errors no doubt.

Minho さんによる2019年2月7日

Undoubtedly helpful, you got my vote ;O)

arbaman さんによる2019年2月7日

I hear you on the time management. I do not do this for a living, I am more of a hobbyist, I enjoy a challenge and like to figure things out. This is a phone I purchased on the cheap and data recovery is not necessary. When buying it I figured best case I get it to function properly and I have a working phone + did some learning (which to me is the most valuable) worst case, I have a parts phone.

Thanks again, I appreciate your time!

Aaron さんによる2019年2月7日

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Hi Minho, thanks for the response! I have been doing all of the above less removing chips. I don't recall their being too many chips with PP1V8 running through but I am not sure about that, I'll have to check again. An interesting new find is that I plugged the screen into it and found it to be defective, leading me to believe it took a hit at some point too. I also found that that the back light lights up but there is no image, any thought on that? maybe related. Lastly, I have been using ZXW, perhaps I should cross check with some schematics to make sure the quoted components on ZXW are correct, have you ever found ZXW to quote wrong components? I am new to ZXW, I had been using schematics only. Considering it connects to itunes and takes a charge I feel I should not give up quite yet... I was hoping this was going to be a short and sweet job... Should knocked on wood. — Aaron
First of all, this is a water damaged phone and you will be playing whack-a-mole with issues for days on end (unless it's a really simple failure...which this one is not). This should be a data recovery only project. There's nothing wrong with learning though so invest your time wisely.

ZXW is very reliable although it does have errors no doubt. — Minho
I hear you on the time management. I do not do this for a living, I am more of a hobbyist, I enjoy a challenge and like to figure things out. This is a phone I purchased on the cheap and data recovery is not necessary. When buying it I figured best case I get it to function properly and I have a working phone + did some learning (which to me is the most valuable) worst case, I have a parts phone.

Thanks again, I appreciate your time! — Aaron

iPhone 6s

J4200 - Pin 37 (PP1V8_LCM_CONN) Reading 0.048V - Any suggestions?

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