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Thread Modes TP4056 problems?
#1
Hello all,

I need a little help and it's time to ask the guru's. I am still in the early stages of collecting and processing 18650's. It is taking forever to charge and test all these batteries( I am about 1/2 way of my 1350 18650's). I did a bunch of research and built some charging boards. I followed Seidel Philipp's 18650 PCB design. It was nice of him to provide all the files and such, so we can charge batteries a little faster. Thanks Seidel. Anyways, I have 5 boards made up except for the diodes. The diodes should be in the next couple of days. I got my 5v power supply in today and went to test my charging boards (without putting in any batteries) and think I have a few issues.

Here is a pic of what I am seeing:

[Image: zamftn1.jpg]

I only have 1 board that all 4 green lights light up. The other boards are either red or not lit at all. In that picture I have 2 green lights, 1 red light and 1 no light at all.

I used my meter and checked for continuity and everything seems fine. Does this mean the TP4056 board is bad? Or maybe the green led is just burnt out? Is there anyway to test and fix it or do I just need to replace each TP4056 that is not working correctly?

Thanks in advance for any help.
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#2
To test if they are working, drop a cell in.

Usually if the red led comes on weak like that, someone is wrong with the power to the board. This could be as simple as the wrong resistors were used on the board (ie, they used one two high value and not enough current is powering the chip) or a bad solder connection from the pre-fab.

Try powering each board directly. Though this is hard considering you soldered everything first (always test boards "before" mass soldering to verify they work individually Wink )
Also verify you are delivering enough current overall to the boards. There could be just enough voltage drop to the TP units that they aren't powering on fully. The TP4056 is finicky when it comes to power requirements.
Continuity doesn't mean good current flow. Reflow all your solder connections to the boards to make sure there is truly good contact with the board traces. This would include checking the IC's themselves to make sure they have good pads as well. Maybe a resistor/capacitor isn't soldered to the board fully. (break out the magnifying lens)
Proceed with caution. Knowledge is Power! Literally! Cool 
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#3
If you connect them in parallel... make sure all red cables from the PC Supply are together , A pic of the configuration of the Power Supply can help

CG.
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#4
a 4056 board with no cell connected should have the charge complete light on and the charging light blinking faintly.
i have seen a few with leds out due to soldering issues.
i just save those for apps where i use external leds.
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#5
I  haven't seen any 4056 glow the red led when no cell is inserted. I have had them show only green, drop a cell, switch to red, fully charged go to green. Or show red, drop a cell stay red but brighter, and then go green when charged.
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
(this chat is not directly affiliated with SecondLifeStorage; VALID email req'd)
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