Tech help - identifying a charging chip?

zippy_un

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Joined
Oct 17, 2018
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Hello

I wonder if anyone can help?
I have a cheapy Aldi or LIDL work light that has stopped working. I'm pretty handy with a soldering iron and I'd like to have a stab at fixing it.

I'm presuming it got plugged into the wrong power supply an it popped the charging chip.

zfADNGSh.jpg




OMtMja4h.jpg



h36BsRMh.jpg


I've had a search for the number on charging board but can't find anything.
There's not a lot left of the chip to get any numbers from.

I wonder if anyone has similar and can check the numbers, or knows any more detail that would help me track down a new chip?

Cheers!
 

zipplet

Flashlight Enthusiast
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Dec 11, 2006
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Can you please confirm what type of battery is used in the light, and how many cells, and if in series or parallel?

(I'm suspecting 1 li-ion cell so far)
 

zippy_un

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Oct 17, 2018
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Can you please confirm what type of battery is used in the light, and how many cells, and if in series or parallel?

(I'm suspecting 1 li-ion cell so far)

Correct.
Blue shrink wrapped plastic
JETPOWER BATTERY
Li-ion 1000mAh 3.7V 3.7Wh
WLC-18650-1000 (1IXR 19/66)
 

zipplet

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This looks like one of those common 6 pin sot-23 style li-ion charger ICs.
It's impossible to identify which IC as it is burnt up - but if you look around at a few of them on the market and trace the connections comparing to the datasheet, you should be able to find a compatible part. Replacing that part should fix it.
Are there any other burnt parts?
 

zipplet

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Please can you provide a high resolution, in focus picture of both sides of the PCB with good lighting?
We can help you to trace out the board and find a chip that will be compatible.

The one you have found might not have the correct pin-out for your board - it also has very low charging current so charge time will be long (about 1000mAh / 180ma = 5.5 to 6 hours)
If we cannot find a chip with the correct pinout, we can rewire the board to work with a different (but similar) IC.
 

Microa

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Mar 10, 2011
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Hong Kong
Yes, the link is for TP4057. The resister R2 is employed to set the charging current. Adjust the charging current according to the specifications of the battery.
 

zipplet

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Dec 11, 2006
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1,139
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The rest of the board looks fine, so replacing that part should restore full functionality.
 

zippy_un

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Oct 17, 2018
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7
Thank you everyone, there are 5 on their way to me via a slow boat from China. So a couple of spares to practice on :whistle:
 
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