Author Topic: Raspberry Pi4 chip blown need ID  (Read 761 times)

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Offline horga83

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Raspberry Pi4 chip blown need ID
« on: October 25, 2021, 10:57:56 pm »
Hi All,

I have a RPI4 and the 6 pin chip just behind the USB2 connector is fried.  I have tried to search for the ID which is BJ9uD but alas nothing found.
Can anyone help me out here.

Thanks in advance.
George
 

Offline amyk

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Offline horga83

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Re: Raspberry Pi4 chip blown need ID
« Reply #2 on: October 26, 2021, 02:37:43 am »
Yes here is a picture.  I can't get the camera close enough to take a pic but through the microscope it is certainly a BJ9uD
Thanks for your reply I tried to look up the BJ9YK in your link but no luck.
The SY810B could be a candidate.
 

Offline amyk

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Re: Raspberry Pi4 chip blown need ID
« Reply #3 on: October 26, 2021, 01:33:09 pm »
BJxxx is SY8101B.

As an aside... what is this half-baked piece of crap they call a "schematic"? :wtf:
https://datasheets.raspberrypi.org/rpi4/raspberry-pi-4-reduced-schematics.pdf
I'm surprised no one has RE'd the whole thing yet, given how many have been made. Shows what the "maker community" is actually capable of... :palm:
 
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Offline horga83

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Re: Raspberry Pi4 chip blown need ID
« Reply #4 on: October 26, 2021, 06:39:52 pm »
Thank you very much, now if I can find a place that would sell me a couple, any suggestions?
My normal sources, digikey, mouser, amazon, ebay etc all fail to have them.
 

Offline wraper

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Re: Raspberry Pi4 chip blown need ID
« Reply #5 on: October 26, 2021, 07:08:20 pm »
BJxxx is SY8101B.

As an aside... what is this half-baked piece of crap they call a "schematic"? :wtf:
https://datasheets.raspberrypi.org/rpi4/raspberry-pi-4-reduced-schematics.pdf
I'm surprised no one has RE'd the whole thing yet, given how many have been made. Shows what the "maker community" is actually capable of... :palm:
It's certainly not SY8101B. It's a USB power switch with current protection. AP2552W6-7 https://www.diodes.com/assets/Datasheets/products_inactive_data/AP255x.pdf (page 13)
« Last Edit: October 26, 2021, 07:11:07 pm by wraper »
 

Offline wraper

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Re: Raspberry Pi4 chip blown need ID
« Reply #6 on: October 26, 2021, 07:16:47 pm »
BTW does this Raspberry pi boot? Because if it does not boot, you have more problems rather that just a dead USB power switch.
 

Offline horga83

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Re: Raspberry Pi4 chip blown need ID
« Reply #7 on: October 26, 2021, 07:20:27 pm »
It boots just fine and everything else works just the USB ports are dead.  lsusb shows the hubs so those seem ok.  A device attached to one of the USB ports had a failure and put some unknown amount voltage (likely +15 to 25) on the port.
 

Offline wraper

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Re: Raspberry Pi4 chip blown need ID
« Reply #8 on: October 26, 2021, 07:25:05 pm »
AP2552W6-7 is out of stock at major distributors. You can also use AP22652AW6-7 instead which is in stock.
 

Offline horga83

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Re: Raspberry Pi4 chip blown need ID
« Reply #9 on: October 26, 2021, 07:26:09 pm »
I see that, thank you, just ordered a few from Digikey, we'll see what happens.

Thank you all for your help.
 

Offline wraper

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Re: Raspberry Pi4 chip blown need ID
« Reply #10 on: October 26, 2021, 07:30:30 pm »
As you said a high voltage came in, I looked more and it looks like 100uF cap (connected to USB VBUS) has a hole on it's side and solder mask came off from a copper trace.
 

Offline horga83

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Re: Raspberry Pi4 chip blown need ID
« Reply #11 on: October 26, 2021, 08:36:28 pm »
Took the chip off and all looks well.
 

Offline wraper

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Re: Raspberry Pi4 chip blown need ID
« Reply #12 on: October 27, 2021, 06:33:39 am »
 


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