Help identifying components.

[Henkel]

Hi. Hope you are all going strong.
I was really hoping someone could help me identify some components on a circuit board from an IP camera. Image attached.
Your assistance would be greatly appreciated. Please excuse my ignorance if any.

 

[Externet]

Welcome.
1: Two zero ohm resistors
2: 15 ohm resistor probably thermal.
3: Diode
4: Capacitor
5: Capacitor
6: Ferrite bead

 

[Henkel]

Thank you Externet. With regards to the capacitors, how do I identify/measure the type of capacitor being used? Same for the ferret bead.

 

[Nigel Goodwin]

Thank you Externet. With regards to the capacitors, how do I identify/measure the type of capacitor being used? Same for the ferret bead.

Take the capacitors out and measure them, they commonly don't have any markings - the ferrite bead doesn't really matter anyway, it's just a bit of wire going through a piece of ferrite, and a piece of bare wire would work just as well.

Why do you want to know anyway?, do you have a similar board where those components have been damaged?.

 

[Henkel]

Hi Nigel Goodwin. Thank you for your advice. I have another board exactly the same that got burnt out. Most of the components are ok, just a couple of the ones from my image above need replacing. Possibly not all of them but thought I might get the parts in while I was at it just in case.

 

[Sophia Zeng]

2 should be a WAYON SMD PPTC or WAYON SMD fuse,attached are pictures for your reference.

 

[Henkel]

Hi Sophia Zeng Thank you very much. I thought it might be some kind of fuse. I was not finding anything online that was similar as a resistor and it runs in line with my power input.

 

[Nigel Goodwin]

Hi Sophia Zeng Thank you very much. I thought it might be some kind of fuse. I was not finding anything online that was similar as a resistor and it runs in line with my power input.

Has it blown?, it's easily checked with a meter. Also check the diode, that 'might' be a reverse polarity diode, and could have gone short if the power was connected the wrong way. The other parts shouldn't be damaged, unless mechanically so.

 

[Henkel]

Nigel Goodwin It has blown. I put too much power through the input. The 3 parts that are definitely gone are 2,4 and 5. Attached image of the blown board. The trickiest part to replace will be the small capacitor, number 7.

 

[Nigel Goodwin]

In which case 4 is probably an electrolytic or tanatalum capacitor (by the way it's split), and a much higher value than the others. I'd also quite expect other components to have been damaged as well, but giving no obvious visible signs - the little 6 pin IC to the left of 7 would be a likely suspect?.

 

[Henkel]

Thanks Nigel Goodwin. I still have to do a fine check on all the components. I am hoping it will just be the obvious ones that are gone, but the chances of others being an issue are quite probable considering I stupidly pushed 240V through 12 volt system. Im hoping the fuse took most of the impact and the others are minor collateral.

I am having trouble sourcing a new fuse with the same specs. This one has an ih=1.5A and lt=3A. Would it be a problem if I used on that has ih=1.1A and lt=2.2A?

 

[Sophia Zeng]

Hi Sophia Zeng Thank you very much. I thought it might be some kind of fuse. I was not finding anything online that was similar as a resistor and it runs in line with my power input.

Maybe you can contact with the sales from Wayon,and check if they can get any samples for you.

WAYON|Circuit Protection&Power Semiconductor&IC Products

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www.way-on.com

 

[Nigel Goodwin]

Thanks Nigel Goodwin. I still have to do a fine check on all the components. I am hoping it will just be the obvious ones that are gone, but the chances of others being an issue are quite probable considering I stupidly pushed 240V through 12 volt system. Im hoping the fuse took most of the impact and the others are minor collateral.

You'll be VERY lucky if it's not damaged a lot worse if you're stuck 240V up it

Many years ago, Pace used to sell an analogue (Sky type) satellite receiver with built-in surround sound amplifiers, and we returned one to Pace for repair on behalf of a customer. The units used the usually 'push and release' speaker terminals, and a figure 8 mains lead. For some bizarre reason after he took it home, the customer cut the figure 8 plug off the mains lead, and connected the bare mains wires to one of the speaker terminals?. This required another return to Pace

Presumably that puts your occurrence to shame

I am having trouble sourcing a new fuse with the same specs. This one has an ih=1.5A and lt=3A. Would it be a problem if I used on that has ih=1.1A and lt=2.2A?

Just for testing I wouldn't bother with a fuse at all, just temporarily short it out, and power the unit from a bench PSU with current limiting - then assuming you manage to get it working?, you could worry about sourcing a fuse then.

 

[Henkel]

Thanks Nigel, that does make my incident look like like childs play.
That being said, I am not entirely optimistic that I have not properly cooked my board, but I figured if I can not do any worse I might as well try fix it. (Famous last words).
Good advice on just shorting the fuse for now. I will give it a try and go through the whole board properly.