Texandro
Posts: 7
Joined: Tue Aug 06, 2019 9:07 am

RPi 4 - power problem

Fri Sep 06, 2019 10:09 am

Hello everyone,

I am a developper for belgian industry in museum creation.
I do love to use the pi, but have run into much trouble with the pi 4.

This si the setup:

pi 4
raspberry pi's power supply
Kingston industrial crade 32gb sd card
permaproto hat

wired to a perma proto hat :
3 leds
1 relais board
1 3v3 as input.
1 input for IR receiver

application is written in python.
when it gets an ir value 16 makes one led flash and plays sound
when it gets an ir incomming value 18 other led flashes and plays sound.
Third led i intended for power.
relais to make phone ringing.
3v3 is sent when the phone is taken.

problems that i ran into :

First rpi :
with proto hat on :
booted worked, application worked fine. stopped working for no reason seamable reason.
rpi is powered : red and green led continuously on

thought it was the SD card, made a new one, no changes.

Second raspberry pi :
with proto hat on:
never booted.
rpi is powered : red and green led continuously on

third raspberry pi:
Did detach the rpi proto hat, with the feeling that i could have wired it wrong.
powered up the pi with official raspberry pi power supply.
booted, started to get smoke out of the rpi.
SD card was burning hot.

I tried other SD cards on the first and second rpi, but no change.
I ordered a new powersupply (still official raspberry pi).
Still having red and green led continuously on.

I tried another usb power supply with a usb c cable, same results.

Anybody an idea what I am doing wrong?

Many thanks for your replies!

Texandro

P.S : if you guys need any more information on the electronics wiring feel free to ask.

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RaTTuS
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Location: North West UK

Re: RPi 4 - power problem

Fri Sep 06, 2019 10:26 am

I suspect the wiring - post all diagrams and photos
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Texandro
Posts: 7
Joined: Tue Aug 06, 2019 9:07 am

Re: RPi 4 - power problem

Fri Sep 06, 2019 1:04 pm

Hi!

Thank you for the reply.
As I said I did encounter the problem without the protohat on it... That's why i'm not sure about it being a problem with the protohat or the wiring.
As it is verry simple. still here is diagram and photo of the wiring.
phonesimulator.png
phonesimulator.png (87.2 KiB) Viewed 278 times
protohat.jpg
protohat.jpg (86.58 KiB) Viewed 278 times
protohat1.jpg
protohat1.jpg (87.94 KiB) Viewed 278 times

Could it be a problem with the batch of rpi we bought?

Many thanks for the replies,

Texandro

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 23631
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Re: RPi 4 - power problem

Fri Sep 06, 2019 1:47 pm

I suspect that something in your HW has blown up the Pi's it has been attached to. Or did your Pi's start to fail BEFORE you plugged in your HAT?
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Texandro
Posts: 7
Joined: Tue Aug 06, 2019 9:07 am

Re: RPi 4 - power problem

Fri Sep 06, 2019 2:15 pm

The first one did boot and did work.
I made all the dev and testing on the unit.

the second one (new batch) had problem immediatly. thought it was because of the hw.

The third (new batch) never booted without the pihat so without the hw.


so :

first one : functionned a limited amount of time.

second one : never worked. and was attached to the hardware.

Third one : got smoke out of it : connected to screen power and usbkeyboard no other hw.

ty all

Texandro

Texandro
Posts: 7
Joined: Tue Aug 06, 2019 9:07 am

Re: RPi 4 - power problem

Wed Sep 11, 2019 8:58 am

Hi all,

I did order a new batch of raspberry pi's.

No problems with that batch. tested the hardware with 3 other pi's. :D :D :D

Is there something i can do with my previous batch?


Ty all

Texandro

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davidcoton
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Location: Cambridge, UK

Re: RPi 4 - power problem

Wed Sep 11, 2019 10:08 am

You need to talk to whoever you bought the first batch from. They are responsible for warranty replacements. They may or may not accept them as faulty.

FWIW: did you buy from an authorized reseller, or a random auction site seller?
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Texandro
Posts: 7
Joined: Tue Aug 06, 2019 9:07 am

Re: RPi 4 - power problem

Wed Sep 11, 2019 10:44 am

Authorized reseller : kiwi electronics

hippy
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Joined: Fri Sep 09, 2011 10:34 pm
Location: UK

Re: RPi 4 - power problem

Wed Sep 11, 2019 12:58 pm

Texandro wrote:
Fri Sep 06, 2019 1:04 pm
As it is verry simple. still here is diagram and photo of the wiring.
I don't see any current limiting resistors on your LED's nor the LED of the opto. And the LED of the opto seems to be wired back to front, anode to 0V, when it should be cathode to 0V.

None of that though should cause the SD Card to 'burst into flames' so I would expect there are other issues as well.

Those two-way screw teminals on the board all seem to short together; could that be dumping 5V into the Pi's 3V3 ?

Texandro
Posts: 7
Joined: Tue Aug 06, 2019 9:07 am

Re: RPi 4 - power problem

Wed Sep 11, 2019 3:56 pm

Hi hippy,

Thx for the reply, there are resistors on the leds and the opto, as they're preassembled with it.
They come in kit for the ones we use here.
This plan is just a drawing to know what is wired where. Not a production ready plan.

Thank you for the note on the opto's led on the diagram, I did correct this in our database for as-built purposes.
Many thanks! i did oversee that.

There's no cc between the screwterminal. screwterminals are linked to gpio I/O's or 5V/GND.
if it is between the 5V/GND it would have run out even the verry first rpi that worked fine for years.


And I think we can close the topic since there's no problem with the new batch of rpi with the hw.

Many thanks to everyone :)

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