Good day/evening wherever in The world you may be reading this from.
I have a Marshall Kilburn Bluetooth speaker and live in a country where our power grid is failing, to be optimistic... sometimes daily loadshedding for up to 4hrs and rarely 6hrs a day. It must have been plugged into the mains to charge the batteries (which I find contradicting info on) The original pack is attached in pic and 2 positive and 2 negative wires plug directly into a joined single positive and a single negative input. I assume this means that the 4 batteries are in pairs that are in series per pair at 7.4V. And then linked in parallel to double the mAh. Despite stating 14.8V on the pack which is stone dead. I made up a battery pack 7.4V two series 18650 cells that provide a parallel output of 7.4V and used Samsung 2600mAh to total up 5.2Ah at 7.4V. And she sung like a multicoloured Canary for all of 4 to 5hrs then output signal declined notably. If anyone has info on the power battery pack that will be appreciated.
Now for the doozy...
It derives it's power to charge the batteries from a 220V source. And I couldn't figure why it was not charging the batteries. Opened her up and what looked like a blown trace was component "LL10" which comes from the source of Mosfet 10A60D, through a "Thermistor" I think and fed into the transformer via "LL10".
2 impossible questions scratching the inside of my uneducated skull...
1) is this a normal smd inductor? and...
2) how can I find out the component, it's value, (uH, mH...) and replace it without an inductance meter?
I have asked Marshall and they won't help. If I know the exact component of happily order and replace. As I did with the blown FET.
Consider myself uneducated, but self taught in electronics. So I'm a novice and anyone that is able to assist, please forgive any errors made with terms and descriptions I may have used. If I can get the primary side healthy and working so it charges the batteries ill be very happy. As of now I am sitting with the task of having to remove the battery pack I made and charging on a separate source each time.
Thank you for any feedback and criticism offered. How will we ever better ourselves if we aren't critiqued. Be blessed and I hope you're warm and safe where ever in the world you may be. And I hope you have some tunes to soothe even the savage beast.
☮️
I have a Marshall Kilburn Bluetooth speaker and live in a country where our power grid is failing, to be optimistic... sometimes daily loadshedding for up to 4hrs and rarely 6hrs a day. It must have been plugged into the mains to charge the batteries (which I find contradicting info on) The original pack is attached in pic and 2 positive and 2 negative wires plug directly into a joined single positive and a single negative input. I assume this means that the 4 batteries are in pairs that are in series per pair at 7.4V. And then linked in parallel to double the mAh. Despite stating 14.8V on the pack which is stone dead. I made up a battery pack 7.4V two series 18650 cells that provide a parallel output of 7.4V and used Samsung 2600mAh to total up 5.2Ah at 7.4V. And she sung like a multicoloured Canary for all of 4 to 5hrs then output signal declined notably. If anyone has info on the power battery pack that will be appreciated.
Now for the doozy...
It derives it's power to charge the batteries from a 220V source. And I couldn't figure why it was not charging the batteries. Opened her up and what looked like a blown trace was component "LL10" which comes from the source of Mosfet 10A60D, through a "Thermistor" I think and fed into the transformer via "LL10".
2 impossible questions scratching the inside of my uneducated skull...
1) is this a normal smd inductor? and...
2) how can I find out the component, it's value, (uH, mH...) and replace it without an inductance meter?
I have asked Marshall and they won't help. If I know the exact component of happily order and replace. As I did with the blown FET.
Consider myself uneducated, but self taught in electronics. So I'm a novice and anyone that is able to assist, please forgive any errors made with terms and descriptions I may have used. If I can get the primary side healthy and working so it charges the batteries ill be very happy. As of now I am sitting with the task of having to remove the battery pack I made and charging on a separate source each time.
Thank you for any feedback and criticism offered. How will we ever better ourselves if we aren't critiqued. Be blessed and I hope you're warm and safe where ever in the world you may be. And I hope you have some tunes to soothe even the savage beast.
☮️
