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flat-earther · 02-20-2026, 06:30 AM

BTW the charger failed in under 2 months.

Recently I bought the same charger again and it failed as well, in 10 days.

The same part developed a short circuit. part in old unit marked A319CA, in new unit A348CA.
Since there are 2 of those components inside every charger I took the remaining working one from the old charger to the new one to make the new charger working again....

flat-earther · 12-06-2025, 12:22 PM

maybe clean the switch contacts with alcohol or contact cleaner spray. I had a problem with a cordless vacuum and cleaning the switch solved it.

flat-earther · 09-21-2025, 03:19 AM

New thermal camera video powering up the motherboard itself on the bench. https://rumble.com/v6z954k-faulty-hp...rmal-view.html
What do you guys think is the problem?

flat-earther · 09-21-2025, 01:44 AM

I have removed the motherboard again.
I took new photos because my earlier photos were removed from badcaps....

flat-earther · 09-21-2025, 01:40 AM

That chip is a SAMSUNG S4L85K1X01 J0GXXM J715...

flat-earther · 09-02-2025, 07:53 AM

at 1:26 in the video there is another chip getting hot.
I don't know right now what that chip is as it's inaccessible without removing the motherboard and my old photos I posted here on badcaps of the motherboard are gone, actually all the photos I posted on this forum around may and june 2025 are gone....

flat-earther · 09-02-2025, 03:11 AM

at time 1:50 in the video I see the voltage regulator EH11A 652J84 is heating up....

flat-earther · 09-02-2025, 03:01 AM

As seen with the thermal camera the Texas Instruments SN104961PJP is heating up.
I hope that's not the problem because it's a custom chip....

flat-earther · 09-02-2025, 02:16 AM

New video in which the printer is fully assembled apart from the top part lifted away which is sitting aside (but with all cables connected) so I can see inside the printer.
I show with a thermal camera what it looks like when powering up the printer.
Can you see anything peculiar?
https://rumble.com/v6ye2uu-faulty-hp...mera-view.html

flat-earther · 08-26-2025, 01:34 AM

Thanks.

I got the relay and diode.

First I wired the relay coil to the charger, one wire to ground and the other to an inductor on the charger that I measured has 5V when the charger is plugged in. I also put the diode in parallel on the relay coil.
Now I hear the relay click when plugging a USB cable to the charger.
Then I connected the two battery wires through the relay to the charger so that only when the relay is switched on they get continuity, but otherwise the battery is essentially disconnected from the charger.
I glued the relay down near the...

flat-earther · 08-12-2025, 01:47 AM

source (1-2-3) 11.8V
gate (4) 11.6V
drain (5-6-7-8) 0V...

flat-earther · 08-11-2025, 05:50 AM

Thanks, that looks good HK19F-DC5V-SHG https://www.aliexpress.com/item/33007295607.html

I read somewhere about needing to add a diode on a relay coil.
is that so? do I also need to buy some diode?...

flat-earther · 08-10-2025, 10:39 PM

can you share link of such 2 pole relay and I'll see if I can get any, otherwise I'll get those that I found, I think there's enough space to make two fit.
the relay I linked above was like the only 5V one I found and it's electromechanical which is what I should get right?
Since electromechanical physically disconnects the contacts, I can be sure the battery won't be drained.
There are also solid state relays, but I worry maybe they have some resistance even when off and can still drain battery?...

flat-earther · 08-10-2025, 12:30 PM

But I'm using a 2 cell battery, obviously I need to keep the balancing feature enabled.

Anyway I have removed the BM middle wire and left the battery connected to the radio for 23hours, at the start of the test the battery was at 7.27V, after 23h it's at 7.16V.
So the battery is still being drained even with the balancing wire disconnected.

So the only option is to install two of those relays right? one on B+ and one on B-

flat-earther · 08-10-2025, 04:33 AM

My fridge once developed a problem where the compressor never turned off and the evaporator was just building ice indefinitely.
I found the culprit was a wire that connected to the compressor's terminal was broken off and after reconnecting the wire the problem was solved.
I don't understand how the broken wire caused the problem but that's what happened.

flat-earther · 08-09-2025, 01:16 PM

What do you mean by disabling the BMS?
The charging chip is marked IP2326 and I found a datasheet for it. https://www.badcaps.net/download/?id=0dfdf135...

flat-earther · 08-09-2025, 01:13 PM

Thanks, so I may try disconnecting the common wire and letting it sit and see if the battery still gets drained....

flat-earther · 08-08-2025, 06:17 AM

thanks stj,
so two of these 5V relays would work? SRD-05VDC-SL-C https://www.aliexpress.com/item/1005007905038217.html
is that the type of relay you mean?
I'd have to see if there's room to fit those.

I just wonder how other radios which have built in internal charging deal with not draining the battery? they don't have mechanical relays....

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how to prevent a connected charger from draining battery when not charging?