Hardware Switch stopped booting

Switch2020

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My switched had a bad P13USB and I replaced it. While fixing that chip, I broke plastic batter clip. I replaced it and was able to get the switch to work. It worked for 3 days and then it stopped. I noticed one of the new connector’s connections wasn’t soldered well. So, I resoldered it started starting to the Nintendo Switch logo and dies. I was trying to diagnose what was causing it and now it doesn’t boot all together. I found the resistor circled here missing. I was wondering what’s this resistor for? What’s its value? Will it cause the boot up issues? Does anyone have the schematics? Thank you
 

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LIY2012

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I'm not sure what it's for, but I think that is in the battery fuel gauge circuit. It might cause the booting problem you are having. I measured it on one of my donor boards, and it seems to be 100Kohm.
 
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Modificatorul

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Last edited by Modificatorul,
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Switch2020

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You used hot air, to remove the battery connector ?, maybe you created solder bridge under the fuel gauge ic, if you already lost the resistor, inspect under microscope .
Inspect if the batery connector is soldered ok.


Thank you, I will check the IC. The connector is fine. Any idea how to check if I created a solder bridge?

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I'm not sure what it's for, but I think that is in the battery fuel gauge circuit. It might cause the booting problem you are having. I measured it on one of my donor boards, and it seems to be 100Kohm.
Thank you, I will give that a shot
 

Modificatorul

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Did you use a support for the mb, or you just put the mb on a table ? Try to loock in an angle, very hard to see, if you can better remove , reball just 9 balls 0.25 mm, but first just replace the resistor and test all tracks from battery connector to the test point with a multimeter.
 
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Switch2020

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Did you use a support for the mb, or you just put the mb on a table ? Try to loock in an angle, very hard to see, if you can better remove , reball just 9 balls 0.25 mm, but first just replace the resistor and test all tracks from battery connector to the test point with a multimeter.

Great thank you for the tip. What do you mean by re-ball? Also, can you please point out these tracks/test pads with the battery connector. I don’t have schematics so I am kind of operating blind. I appreciate your help, thank you
 

Switch2020

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Great thank you for the tip. What do you mean by re-ball? Also, can you please point out these tracks/test pads with the battery connector. I don’t have schematics so I am kind of operating blind. I appreciate your help, thank you
Was able to solder back the resistor. The issue persists! I checked the current through a USB ammeter and it’s constant at 0.45amp. It never went to zero to boot up. Any other ideas to consider? Does anyone have the schematics to check for continuity near the battery?
 

Modificatorul

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Reball = remove a bga ic, clean the old solder, put new solder balls, reflow the ic back to the board, i just asuming you shorted the batery ic under the batery conector on the botom of the bord becouse you didn't use something to keep the board flat and rised and you just put it on a table, i could bee wrong so ignore that for the moment, and you need a microscope for this job.

Mb suport example https://www.aliexpress.com/item/329...earchweb0_0,searchweb201602_,searchweb201603_

So folow the traces from the batery connector to the test pad, pads , and use a multimeter in diode/ continuity mode put one probe to one pin of the batery conector to the test pad especialy to the withe one related to batery detection.

Post some good pictures around the batery charging ic and the botom side of the board.

Test with batery removed.

I'm not responsable if you do more damage using my sugestions.

Can you test voltages? do you have a multimeter ?
 
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Switch2020

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Reball = remove a bga ic, clean the old solder, put new solder balls, reflow the ic back to the board, i just asuming you shorted the batery ic under the batery conector on the botom of the bord becouse you didn't use something to keep the board flat and rised and you just put it on a table, i could bee wrong so ignore that for the moment, and you need a microscope for this job.

Mb suport example https://www.aliexpress.com/item/329...earchweb0_0,searchweb201602_,searchweb201603_

So folow the traces from the batery connector to the test pad, pads , and use a multimeter in diode/ continuity mode put one probe to one pin of the batery conector to the test pad especialy to the withe one related to batery detection.

Post some good pictures around the batery charging ic and the botom side of the board.

Test with batery removed.

I'm not responsable if you do more damage using my sugestions.

Can you test voltages? do you have a multimeter ?
Appreciate your recommendation and will try it. How do you know which bad relates to which pin on the connector?
 
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