Marshall Major headphones not charging even when indicator shows they are. - Page 1
Forum section: electronics / repair

author: Miyuki
author_rank: Frequent Contributor
timestamp: March 06, 2022, 09:27:22 am
content: Hi folks.I'm not sure if this is the best forum.I have here Marshall Major II BT headphonesWhen I plug them in for charging, the charging indicator led lights up as charging but the battery is not charged. It just stays on forever and no voltage is passed to the battery itself.When I charge the battery externally it works just fine until it discharges.I cannot find any info on this issue online.Is it just a faulty charging IC or have I any hope?I was trying to find something online but had no luck with this issue. Just dead batteries replacement info.

author: abdulbadii
author_rank: Frequent Contributor
timestamp: March 06, 2022, 09:52:23 am
content: charger only fulfills V, not I, of the requiring charged deviceit's mostly due to capacitors (caps) fault, mostly the first and last capacitorwhich it's mostly due to the capacitors age yieding high resistance / ESR in turn reducing the Ibut else components fault is likely too the nextjust meter all those to prove

author: tooki
author_rank: Super Contributor
timestamp: March 06, 2022, 10:15:24 am
content: Quote from: Miyuki on March 06, 2022, 09:27:22 amAfter 5 years (based on reviews being from 2017), it’s very likely the batteryisbad. What’s possible is that while the external charger doesn’t know anything about the battery parameters and thus charges it “blindly”, the internal charger has been programmed with the battery’s parameters, and is detecting that a parameter is out of limits and won’t charge it. (In particular, the low voltage cutout.)Given that 5 years, presumably being used during that time, is a perfectly normal lifespan for a lipo battery (in fact, even for an unused one, 5 years is often enough to have it fail), I’d first try a new battery, since they don’t cost too much.Quote from: abdulbadii on March 06, 2022, 09:52:23 amOn 5 year old headphones? Nah, extremely unlikely.I wish people would stop assuming failed caps arealwaysthe answer. They aren’t, especially not on equipment that isn’t very old.

author: Miyuki
author_rank: Frequent Contributor
timestamp: March 06, 2022, 02:55:15 pm
content: The battery itself is Ok and newer than headphones.Charging is USB, so it has no "external charger"What I found online bad battery should behave differently anyway.

author: fzabkar
author_rank: Super Contributor
timestamp: March 06, 2022, 11:44:27 pm
content: What happens if you fully charge the battery "externally" and then operate the headphones continuously while connected to a USB port? Is that even possible? My cheapie BT headphones cannot be used while they are charging.If a fully charged battery goes flat while the headphones are connected to a USB port, then this would imply that low voltage cutout is not the issue.

author: tooki
author_rank: Super Contributor
timestamp: March 07, 2022, 11:41:31 am
content: Quote from: Miyuki on March 06, 2022, 02:55:15 pmYOU mentioned external charging in the first post! That’s what I was referring to.Did the replacement battery ever charge internally?How do you KNOW the battery is good? Just because you think it is (or should be) doesn’t mean it is.

author: Miyuki
author_rank: Frequent Contributor
timestamp: March 24, 2022, 08:21:30 pm
content: I tested the battery and it is OkAccepts and holds charge rightSo failure is in the charging logic

author: fzabkar
author_rank: Super Contributor
timestamp: March 24, 2022, 08:59:13 pm
content: Can you show us a photo of the electronics?

author: Miyuki
author_rank: Frequent Contributor
timestamp: March 25, 2022, 10:11:54 am
content: Ill open them, as they will discharge in a few days, and show pictures