Neje BL 3000 restarts again and again - does not boot

Hi
Hope you are doing so good.

I have Neje BL 3000
It was working so great, untill i did not use it for around 4 months.

When i recently charged it for 2 to 3 hours, it turns on momentarily when on battery power, and then turns off.
Then, as i connect it to power adapter, it turns on and off repeatedly.

I disconnected all connections from the main board and it still doesnt work. As i try to connect it to bluetooth app it connects momentarily sometimes but fails to proceed further, and disconnects and restarts.

Battery is not swollen.

I tried another battery, 3000mAH instead of 6000mAH, and both batteries charge good to 4.2 Volts, still it doesnt boot.

Please see videos.

This is the photo of mainboard, nothing appears burnt:

If i disconnect the thermister on battery from the main board, it gives error e05, that means the board knows it has to read the thermister.

Kindly help…

非常抱歉,这个控制板已经是5年的设计了,我查看了一下你控制板的症状,我猜测你控制板的 LDO 可能存在问题。
请尝试在这里添加 3.3V 电源,查看控制板是否可以正常启动。


GND here

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哇 在将 3.3 VOLTS 添加到 LDO 输出后,电路板已通电。我没有 LDO,我在这里添加了 ams1117。它也能工作吗? 非常感谢。 谢谢 NEJE

wow
after adding 3.3 VOLTS to output of LDO, the board has powered on. i do not have LDO, i am addin ams1117 here. will it work too?

many many thanks.
thanks NEJE

嗨,谢谢,现在运行得很好。谢谢 neje

hi thanks it is working so good now. thanks neje

AMS1117 应该可以工作,但是可能不能达到最佳工作状态,因为 AMS1117 的压差在1V左右,也就是说,随着电池电压下降,AMS1117,无法稳定输出 3.3V电压,如果你发现在电池电压不足的时候工作发生异常,请尝试更换 662K 这种型号的 LDO,如果没有异常,可以不需要更换。
祝你玩的愉快!

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