Bluetooth Speakers Turn Off Within 10 Minutes
Received Bluetooth speaker with fault symptom speaker automatically turn off within 10 minutes
On arrival of the speaker I turned ON the Power and started playing some songs from my mobile phone. It played for 5 minute & speaker automatically turned power OFF. So for further inspection I have to open the speaker unit.
I tried to pulled up the front grill gently using needle tool. But some time front grill is fitted using glue you can see border of grill is having the glue.
It took more time for opening the grill because of glue. While removing grill misshaped because it is made of thin aluminum sheet.
Removed all the screws from the top.
for this types fault suspected area is
1) On/ off switch.
2) Battery section.
3) Main circuit board it self.
Removed the circuit for physical inspection.
Checked On /Off switch using Multimeter seems OK.
Checked Battery Charging connector that is also OK…… Removed all connectors & re fitted again for testing still same problem. Checked voltage on Battery it shows 3.83 within normal operating range (4.2v to 3V)
So now seems culprit is main circuit board……… but before fault finding on the circuit board I decided to check with another working battery. Because sometime Battery showing voltage in working range but it won’t hold enough current for a long time because of the bad battery.
Took one working Battery for testing form my battery BOX. I have salvaged few from some old laptop non-working batteries.
Now I took out the Battery & tested the speakers it works for half an hour. It indicates the original battery in the speaker is bad.
So for curiosity I re checked Voltages on old battery.
You can see BMS Output voltage is only 0.9v & Speakers need at least 3V for operate. So here problem is with BMS Circuit……. Still I decided to use working battery which is fully charged. So I took one fully charged battery as a replacement. Took apart old battery for using Cables with connector on replacement battery.
Removed top sleeve cover (Blue) & found one more circuit on Battery which is called BMS. (Battery Management System).
Removed BMS circuit to test with working battery ……But still same low out put on the working battery also.
Hence decided to use battery without BMS circuit because the charging IC T4056 itself take care of charging.
re assembled the unit & tested it works nonstop for 4 Hours……
Speaker is now ready for the pickup by the customer.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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Note: You can check his previous repair articles on ONEPLUS Bullets Wireless Z Bass Bluetooth Not Working No Power