Missing pads on iPad 6th gen after a bad desoldering job

Question

iPad 6

Sexta generación del iPad, lanzado en marzo de 2018. Disponible en Wi-Fi y LTE con opciones de almacenamiento de 32 y 128 GB. Cuenta con una pantalla Retina de 9.7 "y un chip de fusión A10 de 64 bits.

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Dupuis @dudulebidouille

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Publicado: 3 de ene. de 2023

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Missing pads on iPad 6th gen after a bad desoldering job

Hi there !

I am currently facing the same problem as mmejia04 : I have missing pads after a "not very well conducted desoldering" of the connector. I have 15 pads missing... Here is a schematic of my motherboard connectors :

Thanks to bert.harmidomski, I could identified some of the test points I have to make some jumpers to... However, I still miss some data as the iphone 6th gen is not available in Phoneboard...

Here is a picture of what I want to do and of what info I miss...

Could you please help me figure out which test points I need for the missing pads (and correct my picture if I did anythhing wrong as I am a total noob in ipad repair...). Or tell me where I can find the schematic of the ipad 6th gen to load in Phoneboard...

Thanks in advance

Best regards

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@dudulebidouille What is the board number of the logic board in your device. Finding the correct schematics and board views are much, much simpler using the board number. Different versions (WiFi, Cellular, 32GB, 128GB,etc) have different board numbers, and we would need the correct one in order to help

3 de ene. de 2023 - de Geir Ove Andersen

is your model on this list, https://zxwtools.com/en/ArticleInfo_57.h...

3 de ene. de 2023 - de daniel

Hi !

Thanks a lot for your quick answers.

@Geir Ove Andersen : I have no clue where to find the board number of my logic board... All I know is that it's an iPad 6th gen model A1893, with Wi-Fi (no cellular) and 32 GB. Can I find the number somewhere wit the serial number of the ipad ?

@daniel : it appears to me that it's the model iPad 2018_WIFI(820-00996-A) (Polygon) listed on the zxw website. I tried to install ZXW but apparently you need an account... and I am not very good at chinese...

4 de ene. de 2023 - de Dupuis

@dudulebidouille The board number is located (probably in a very small text on the board) it should be something like 820-XXXXX-A or B or something. Could very well be the 820-00996-A as mentioned above.

ZXW is a paid service, you have to pay monthly or annually to keep getting access.

4 de ene. de 2023 - de Geir Ove Andersen

@Geir Ove Andersen: The only number I found close to what you describe is written inside the frame (or housing ? don't know the correct word...) in which the logicboard is glued. the number is : 604-19060-A

followed by a date (I guess...) : 2018.04.02

and another bunch of numbers/letters on 2 other lines :

L14B 021261

I04 ML03 MS02

I am not sure that helps...

4 de ene. de 2023 - de Dupuis

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@dudulebidouille What is the board number of the logic board in your device. Finding the correct schematics and board views are much, much simpler using the board number. Different versions (WiFi, Cellular, 32GB, 128GB,etc) have different board numbers, and we would need the correct one in order to help — Geir Ove Andersen
is your model on this list, https://zxwtools.com/en/ArticleInfo_57.h... — daniel
Hi !

Thanks a lot for your quick answers.

@Geir Ove Andersen : I have no clue where to find the board number of my logic board... All I know is that it's an iPad 6th gen model A1893, with Wi-Fi (no cellular) and 32 GB. Can I find the number somewhere wit the serial number of the ipad ?

@daniel : it appears to me that it's the model iPad 2018_WIFI(820-00996-A) (Polygon) listed on the zxw website. I tried to install ZXW but apparently you need an account... and I am not very good at chinese... — Dupuis
@dudulebidouille The board number is located (probably in a very small text on the board) it should be something like 820-XXXXX-A or B or something. Could very well be the 820-00996-A as mentioned above.

ZXW is a paid service, you have to pay monthly or annually to keep getting access. — Geir Ove Andersen
@Geir Ove Andersen: The only number I found close to what you describe is written inside the frame (or housing ? don't know the correct word...) in which the logicboard is glued. the number is : 604-19060-A

followed by a date (I guess...) : 2018.04.02

and another bunch of numbers/letters on 2 other lines :

L14B 021261

I04 ML03 MS02

I am not sure that helps... — Dupuis

Alisha C @flannelist Rep: 33.2mil 26 35 32 · Answer 1 · 2023-01-04T17:55:04-07:00

If you have a mulitmeter, you can check this for yourself. I will also mention, jumpering all the way to the test points may not be necessary depending on how much of the trace was pulled up. Think about how the connection got to the solder pad in the first place. There's likely some of the trace that feeds into these left. You can scrape away some of the solder mask that covers the actual copper board trace (be gentle, since it's fragile) leading off of whatever pad. You can solder the jumper to that, even if it's just for added stability. You can also use the exposed copper to check the surrounding test points for continuity with a multimeter. If your multimeter doesn't have continuity mode (mode do) you can use check for close to zero resistance.

~~~

That being said, this should fill in your missing info. This is a less than ideal layout for jumpers, but these are at least the test points which correlate to your missing lines. I used green for the test outer row of pads so they're a little easier to distinguish.

I will also mention that ground pads are generally not necessary to jumper. You can for completion's sake, especially since there are quite a few pads missing here, but it's not necessary to have all the ground pads present.

iPad 6

Missing pads on iPad 6th gen after a bad desoldering job

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