Old 02-27-2017, 06:47 AM #1
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Default Need a little electronics assistance...

Any of you SMD heads out there care to make an educated guess as to the value of R1? I can't see with my magnifier what I can see now that I shot this macro. It looks like the burned resistor has a 2, then a burned out number, then either a 4 or a 9. Anyone care to extrapolate from the rest of the circuit, and the burned component, what R1's resistance is? This is a single cell LiPO charging circuit powered from 5v USB.

Thanks in advance,
-G

(Edit) Looks like the burned out character may be an R, as in 2R4 or 2R9? Maybe? (/Edit)


[IMG][/IMG]


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Old 02-27-2017, 08:32 AM #2
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Default Re: Need a little electronics assistance...

If all else fails, you could solder a small potentiometer across it and adjust from a high to lower resistance value until the board starts working correctly. Might not be worth it, unless you have a bunch of pots in your junk pile already.

Edit: Although I wonder what caused the failure to begin with, if it is still present that trick might just make something else burn out. That and I don't know what the top end resistance of the pot should be, put too large a resistance pot in there and tiny movements at the low end might overshoot too much.

My wild guess is it is 274 ohm? Or maybe that is a code number and not a resistance? Where is cyparagon when we need him? If I am wrong, he will surely help.

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Old 02-27-2017, 02:07 PM #3
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Default Re: Need a little electronics assistance...

Where did you get the PCB ?
The seller must have more of the same and
could give you the R1 ID from a new PCB.

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Old 02-27-2017, 02:15 PM #4
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Default Re: Need a little electronics assistance...

What, practical advice! How dare you!
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Old 02-27-2017, 02:17 PM #5
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Default Re: Need a little electronics assistance...

Yeah, I thought about that, as well. Problem is, it's from a pretty large Chinese company and the truth is I'd probably have better luck just gruntin'' real hard and shittin' one myself than I would trying to get ahold of someone who actually knows what a resistor is. Good advice in most situations, tho.

Thanks,
-G

Quote:
Originally Posted by lasersbee View Post
Where did you get the PCB ?
The seller must have more of the same and
could give you the R1 ID from a new PCB.

Jerry
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Old 02-27-2017, 02:22 PM #6
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Default Re: Need a little electronics assistance...

I feel your pain on that one, near impossible, even if you went to the vendor.
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Old 02-27-2017, 02:46 PM #7
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Default Re: Need a little electronics assistance...

Looking at your PCB it seems that it came as
an enclosed charger with an LED indicator.

You could try what Alaskan suggested above
with a Pot or you could just get another similar
USB to 1 Cell Lipo chsrger. ~$0.76 USD with
free shipping.

5V Micro USB 1A 18650 Lithium Battery Charging Board Charger Module New HCD | eBay


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Old 02-28-2017, 12:49 AM #8
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Default Re: Need a little electronics assistance...

Where is the picture of the bottom side? All I'm seeing here is a current limiting resistor, and a transistor to change the color of the LED when a certain voltage is reached.

If this board has no components on the bottom, throw it out - it is a death trap.
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Old 02-28-2017, 01:04 AM #9
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Default Re: Need a little electronics assistance...

My guess is that it is part of a charging unit for batteries, but that is only because of what I can see on the front of the board. If that is what it is used for, you can probably live without it and still use the charger.

Edit: oh crap. I just reread the OP and it is from a charger. Yeah, I'd guess you can throw it away and use the rest of the charger.
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Old 02-28-2017, 04:10 AM #10
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Default Re: Need a little electronics assistance...

Quote:
Originally Posted by paul1598419 View Post
Yeah, I'd guess you can throw it away and use the rest of the charger.
B+ and B- silkscreen implies this IS the entirety of the charger.
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Old 02-28-2017, 04:25 AM #11
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Default Re: Need a little electronics assistance...

Quote:
Originally Posted by Cyparagon View Post
B+ and B- silkscreen implies this IS the entirety of the charger.
I suppose that could be the case, but it would be in incredibly cheap charger. If that is all there is, then still throw it away.
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Old 02-28-2017, 03:26 PM #12
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Default Re: Need a little electronics assistance...

I can't really tell from the pictures, but i presume it is a 2.4 ohm resistor due to the markings you got and the fact it burned out.

The middle character must have been R, since the last character is 4 or 9, resulting in value of numerous kilo-ohms in case of for or something rediculous in the order of giga ohms if 9.

2.4 ohms is a pretty common value, though it must have burned out for a reason, and simply repacing the component will not solve that problem.
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