thanks.

 

Electrolytic capacitor or diode.
We need to see the markings on the SMD.

 

Hello,

The picture is very tiny. You can not read what is printed on the component.
As it has a line on one side it must be polarized.
As @MrChips said, it could be a diode or electrolytic capacitor.
A zener diode may also be an possibility.

Bertus

 

Wow! That’s a really small image.

Can you post another image, larger and clearer? Not necessarily closer, just larger. If you can, take the highest quality image that you can and crop it to show just the top of the component.

Thanks.

 

Wow! That’s a really small image.

Can you post another image, larger and clearer? Not necessarily closer, just larger. If you can, take the highest quality image that you can and crop it to show just the top of the component.

Thanks.

Or just tell us what the text on it says.

 

thanks to all.
1. the text: FAKI3? ;
2. measured with the resistance function nothing reading.

 

It looks like a Fairchild brand rectifier but picture is too hard to see.

similar to this:
https://www.mouser.com/ProductDetail/ON-Semiconductor-Fairchild/S1M?qs=RJwZ8kJo1mhFujnIpzoJdg==

 

thanks to all.
1. the text: FAKI3? ;
2. measured with the resistance function nothing reading.

If measuring a diode with resistance range you will get a false reading, requires a diode check range.
This imposes forward voltage across the device.
Max.

 

If measuring a diode with resistance range you will get a false reading, requires a diode check range.
This imposes forward voltage across the device.
Max.

Thanks, the diode check range.read nothing from there.

 

How about this 'R', what's the value of it?

 

What does it measure?
Max.

 

Hello,

You might want to have a look at this page for MELF resistor color codes:
https://www.electronics-notes.com/articles/electronic_components/resistors/melf-smd-resistor.php

Bertus

 

the reading is '0' (burned?), I guess I found the location of fault, but can't figure out the value, two Dark blue rings. and can't see the first ring, should be Silver？ or just two rings?

 

You sure thats not a diode? Looks more like diode then resistor to me

 

View attachment 175407 the reading is '0' (burned?), I guess I found the location of fault, but can't figure out the value, two Dark blue rings. and can't see the first ring, should be Silver？ or just two rings?

Don't jump to conclusions so quickly.
An SMD component with two black rings can simply be a 0Ω resistor. Circuit designers have many reasons for installing 0Ω resistors in a circuit.

 

I have used SMD fuses that looked a lot like that. And the first picture looked more like a capacitor to me. But was the reading the same in both directions? That can provide a clue.
ALSO, how about a picture of the whole board, or at least some larger potion of it. More information will often lead to much better answers.

 

Looks like brown-black-black-silver, 10Ω 10%.

The large size would make sense for that value.

On the other hand, very hard to tell out of context.

 

Yak is correct. If you can trace out a bit of the surrounding circuit then a much better evaluation would be possible. One more thing is that by the shape of the part the circuit board is quite a few years old, since it has been quite a few years since surface mount parts changed shape to the more rectangular format. So probably the circuit board is not terribly crowded. So a clear photo will be able to provide some useful information.

 

Thanks.
1. 'An SMD component with two black rings can simply be a 0Ω resistor. ' is reasonable, because I hooked up a pot and tested out the circuit only works when the R<150 Ω, and 10 Ω is OK;
2. 'You sure thats not a diode?' measured two directions all '0';
3. a large pictures here.

it is a wheelchair joystick board.

 

I think that I see that component right next to a memory battery. That location would point towards the device being a fuse.