Noco boost charger not recharging

[learnmore]

Hello, community!

I have a Noco Boost car charger that does not charge. It's a Noco GBX155. I've tried providing 5 and 12 V for hours, but it draws 0A. I've also manually charged the cells in the battery pack, which are about 13V (there are 4 (4V) cells, I believe). All the other functions work fine: boost, torchlight, turns on and off.

I looked around at the caps, diodes and resistors and could find nothing unusual. The charging IC is an Intersil. There were no holes, and the pin out/in seemed okay.

I did give the Intersil chip some heat to reflow. A day later, it is now taking 0.18A. I'm unsure if this is related to the reflow attempt.

I've uploaded a short video showing what happens when I attempt to charge. A red error light (according to the manual) begins to flash-this light flashes white for fast charge. Again, no amps are drawn.

Anyone with the knowledge to help or provide a schematic or service manual. I've asked the company, but no dice.

Thanks
LM

[CapLeaker]

Re: Noco boost charger not recharging

Maybe the cells were or are out of balance? Could also be a reason for not charging.

[CapLeaker]

Re: Noco boost charger not recharging

Maybe the cells were or are out of balance? Could also be a reason for not charging.

[sam_sam_sam]

Re: Noco boost charger not recharging

Maybe the cells were or are out of balance? Could also be a reason for not charging.

I would agree with you on this and I would suspect that the cell are very unbalanced or you bad cell or cells ( meaning 1.0 volts or less ) some BMS protection boards are very picky about voltage imbalance 0.25 volts or less between battery cell rails

[Dementor]

Re: Noco boost charger not recharging

@learnmore did you solved anything with the charging process? I have a GBX155 also and in my case it shows a solid red charge light and doesn't draw any current. Any other funcționa work well. Any ideas?

[learnmore]

Hello All,

Forgive me for now getting back to this thread soon and thanks to all who contributed. Dementor the guys are correct, unbalanced cells are bad business and you pretty much screwed. However, I've also found the charging IC (ISL XXX) is somtimes blown and maybe the culprit. However, getting a 1:1 replacement maybe a task. I've seen on guy on YT source and experiment with cell replacement and IC replacment.