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This wireless speaker switches on and switches between inputs like BT, wifi, aux line in but there is no audio. Power supply measures 5.6v at one terminal as marked on the board but 3 points labelled 26v have no voltage. I think the 5.6v supplies the control circuitry BT etc and the 26v should power the audio circuitry - hence no sound.
Inspecting the power supply I found an IC which has blown. (See pic you will need to zoom). It is situated close to the AC input on the PCB. The fragment blown off the IC is marked TOP249YN. Internet search found that it is an "AC to DC Switching Converter Off-Line Switcher". The spec sheet makes several references to the component having functions to protect the pcb/unit. This component is available for about £7 on-line.
My electronics knowledge is limited but I am reasonably competent with soldering. Is it likely that this component failed due to a fault elsewhere in the system or is there a good possibility that simply replacing it might fix the speaker?
I would be very grateful for any advice. Thanks in advance,
Martin
(I am aware that the pcb carries mains voltage and I am careful to isolate it and discharge the large capacitor before handling anything.)
Inspecting the power supply I found an IC which has blown. (See pic you will need to zoom). It is situated close to the AC input on the PCB. The fragment blown off the IC is marked TOP249YN. Internet search found that it is an "AC to DC Switching Converter Off-Line Switcher". The spec sheet makes several references to the component having functions to protect the pcb/unit. This component is available for about £7 on-line.
My electronics knowledge is limited but I am reasonably competent with soldering. Is it likely that this component failed due to a fault elsewhere in the system or is there a good possibility that simply replacing it might fix the speaker?
I would be very grateful for any advice. Thanks in advance,
Martin
(I am aware that the pcb carries mains voltage and I am careful to isolate it and discharge the large capacitor before handling anything.)
