[Solved] JBL T450BT Headphones: Unexpected Shut Off After 30 Seconds - Seeking Advice

Hello, a problem with the jbl t450bt headphones. Out of the blue they started to turn off by themselves. Can turn on, pair and after 30 seconds they die. Warming up with hot air helps for about 2 hours and everything is ok then the problem returns. Another heating and they work again. Any advice or better trash and buy new ones? Thanks and best regards

You may want to check the condition of the built-in battery.

The headphones were bought 3 months ago so the battery is rather out. On warranty I did not return because no receipt.

michaltraczyk84 wrote:

Can turn on, pair and after 30 seconds they die. Warming up with hot aire helps for about 2 hours and everything is ok then the problem returns. Another heating and they work again.

I would put it on the battery. How long have you had these headphones? Is it possible to wear out the battery? The problem could be generated by two factors:
- a worn-out battery has too little stored energy and after about 30 minutes the headphones turn off for this reason.
- the headphones "report" to the smartphone the battery level. Perhaps the headphones are disconnected by the smartphone when the energy level is found to be too low.

Warming helps for a while probably because batteries at higher temperatures have a slightly higher efficiency. The effect is the same as with old finger batteries, which could be "resuscitated" for a bit after overnight warming on the radiator. If my diagnosis is correct, then an effective solution will be to replace the battery with a new one. This thread may help a little: https://www.elektroda.pl/rtvforum/topic3546284.html It should fit JBL P062831 (considerable cost) or its replacement Cameron Sino Jbl Synchros S400Bt P062831, or any other replacement in such a case with parameters: 600mAh 2.22Wh Li-Polymer 3.7V. I don't have the handsets at hand, but you can easily tell the type of battery by disassembling the old one.

michaltraczyk84 wrote:

Any advice or is it better to trash and buy new ones?

The cost of a new replacement is about 30-40zl, so I guess it pays to repair the headphones. You can easily find links to several offers in the search engine.

I have had the headphones for less than 3 months. Heated was the very board that I soldered. I will find some battery and see what happens after replacing it, but I doubt it will do anything.

michaltraczyk84 wrote:

I've had the headphones for less than 3 months

For new equipment, it makes no sense to repair it yourself - since there is a warranty and guarantee, after all, you can request an effective repair of defects. You have two years to do so.

michaltraczyk84 wrote:

On warranty I did not give because no receipt

The receipt is not necessary to make a successful claim - only "proof of purchase" is important. Thus, the same function as the receipt has the following:
- VAT invoice (if it was issued),
- statement of account (with visible payment for these headphones),
- confirmation of payment by card (for example, a printout from the terminal),
- e-mail confirming the conclusion of the sales contract,
- electronic confirmation of the end of the auction (for example, when buying on an advertising site).
Even if the purchase took place at a marketplace, and the payment was made in cash without confirmation, a statement by, for example, witnesses to the transaction is sufficient "proof of purchase."

michaltraczyk84 wrote:

Heated was the very board that I soldered.

Unfortunately, this fact can effectively prevent a claim. But since you have the headphones taken apart anyway, try to remove the old battery and in its place connect (on cables) any other battery with the parameters indicated above. This will at least allow you to confirm or exclude the failure of the battery.

Battery swapped and same effect unfortunately .

And what are you actually blowing there?
Yes I am looking for what is there, and actually this side of the board is not in google graphics. Not on google, not there at all?
Can't you, instead of blowing, re-solder by adding normal tin?
Pay attention to the vias, that's what I associate with one radio, where they cracked and under the influence of "expanding" laminate temperature, stopped connecting the two sides of the board.
AKURAT under the processor, that is, in order to fix it well, it had to be soldered out first.
Heating was ineffective, because the tin was not there.

Added after 1 [minute]:

Is it even possible? Does something get heated?

Such is the platitude. .

Trash .