JBL Cinema SB150 Wireless Bluetooth Soundbar Repaired
Received Sound bar for Intermittent Bluetooth working Problem.
I have connected sound bar on power and turned it ON. It has control panel in this order sequence……
1) Standby Release
2) Source select ( AUX/Optical/Bluetooth)
3) Volume –
4) Volume +
6) Bluetooth Pairing.
In front panel there are some LED Indicator Lights which indicates each working Mode like………
After powering ON & pressing of source Button, LED indication changes to Green and White light but not to Blue. So now it is time to inspect the circuit of the sound BAR. Removed the circuits from back side of the BAR.
It has Two Circuits, Controller & SMPS.
Cleaned Dust from the PCB. Found some Dry solder On SMPS Circuit and revived the solder.
As per physical inspection I did not found any damaged or burnt parts. After cleaning work I re plugged sound bar on Power But it behave as it is. Now my curiosity in this job is Bluetooth area on controller circuit.
Identified Bluetooth circuit location from Antenna on inspection under the magnifier glass. in this area everything seems Ok but I did not able to trace In and Out because there is no marking on the PCB. Again Cleaned the area again with IPA and re plugged the sound Bar on Power to check if any IC or other parts are getting abnormally hot.
But I did not found any overheating Component. Now I have to check another circuit…… Control Panel Circuit.
On testing operating of some keys I found “+” switch suspected because when I press the “+” switch I can see Blue Light is coming ON and goes OFF instead of increasing the Volume.
So opened the circuit and checked the switch for Continuity, on pressing I found Instead of Continuity it shows some reading.
Removed the “+”switch for testing because some time testing components on PCB may multimeter gives false reading.
Meter is showing around 1.6K ohm reading instead of continuity beep.
So for Curiosity I opened the micro push switch for inspection.
I found Contacts and Metal dome is badly oxidized. it can work perfectly after cleaning the contacts by scrubbing with sharp knife and then cleaning with “IPA” but critical part of switch to relocate the metal square Frame. Because when you put some glue on it glue will get drip down into the entire functional area and switch becomes useless.
So decided to change all the micro switches. After replacing all the switches. Now Sound bar is back to work.
Standby –Amber Light Indicator.
AUX – Green Light Indicator.
AND Bluetooth – Blue light Indicator.
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 Dell 2015hF Monitor Repaired