Zero Plus fried after connecting to power

Stratos

Hey there. So today my brand new Orange Pi Zero Plus (from aliexpress) arrived. So I put OS on SD and put it in Pi. Then I connected it to my phone charger (5V, 2A). And now, one little component is fried. What have I done wrong and is there any way of repairing it?

silentbogo

This is a 3.3V buck converter which powers the 3.3V AVCC and RTC.
Part number is: SY8008B
Datasheet: http://www.sunnyqi.com/upLoad/product/month_1306/SY8008.pdf

You can order it off Aliexpress or try to look for it at your local electronic components store.
https://www.aliexpress.com/premi ... 00103&isViewCP=

Also, you have to make sure that a faulty step-down converter is the cause and not a symptom of your problem. What I mean, is you need to remove that broken part with a hot air rework station and check if you have a short circuit on 3.3V rail.

Stratos

silentbogo replied at 2017-9-6 01:04
This is a 3.3V buck converter which powers the 3.3V AVCC and RTC.
Part number is: SY8008B
Datashe ...

Do you mean by 3.3V rail 3.3V pin on GPIO?
And if that is not the problem, might you have any idea what can cause it?

BTW thank you for your fast response

silentbogo

Stratos replied at 2017-9-6 01:11
Do you mean by 3.3V rail 3.3V pin on GPIO?
And if that is not the problem, might you have any idea ...

It can happen for a number of reasons, from accidentally shorting 3.3V to the ground, to another faulty component or a dead SoC.
Most likely an accidental short circuit.
Check the resistance between 3.3V and GND just in case (with the board powered off, ofcourse).

Stratos

silentbogo replied at 2017-9-6 03:45
It can happen for a number of reasons, from accidentally shorting 3.3V to the ground, to another  ...

I turned on my volt meter in beeping mode (when you short something it beeps) When I put + on 3.3V pin and - on any ground pin it shows 356 (if 0 it beeps, normally it shows 1) When I put - on 3.3V and + on any GND it shows 306.
When I use 20K resistor (on my voltmeter)and + is on 3.3V and - on GND = 9.19; when + on GND and - on 3.3V = 7.01
Don't know if it means good or bad. I would love to hear from you again if it is good or bad.
Images are too big to be posted here so here they are: https://imgur.com/a/223qN (they are in order)

P.S.: For better understanding look at pics.

silentbogo

Seems like there is no short on the board, so it's safe to replace that buck converter.
If you don't have a hot air rework station, I would probably take it to an electronics repair workshop. They might even have a replacement buck converter for you too.
This part is very common in tablets, laptops, household electronics etc.

Just don't do it with a regular soldering iron, cause you might damage the board even further.

Stratos

silentbogo replied at 2017-9-6 22:38
Seems like there is no short on the board, so it's safe to replace that buck converter.
If you don't ...

I am pretty skilled with a soldering iron so I take the risk. And is then possible that the problem is the converter?

silentbogo

Stratos replied at 2017-9-6 22:48
I am pretty skilled with a soldering iron so I take the risk. And is then possible that the proble ...

You have no short circuit on 3.3V and there is a hole in a 3.3V buck converter. I'm pretty sure those two add up to a faulty converter or accidentally shorted 3.3V (since there is no fuse on that rail).

Stratos

silentbogo replied at 2017-9-6 22:52
You have no short circuit on 3.3V and there is a hole in a 3.3V buck converter. I'm pretty sure th ...

I order them from aliexpres, so I will post results after they get here (2 months at least )

silentbogo

Good luck with your board.