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The Marshall Kilburn Bluetooth speaker is a compact, portable stereo speaker. This speaker comes with a built in Class D amplifier with quality sound range for its size. Bluetooth connectivity also allows for quick connections to bluetooth capable devices.

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Main fuse blows immediately, device is not recharging (or running).

I have a Marshall Kilburn I amp that stopped charging the battery. Once it was completely discharged, it stopped working at all. I decided to take a look on the PCB.


The fuse on the main power supply unit was broken, once replaced, it blew up again.

On the backside of the pcb I found a second blown up part, that was named LL10 (see picture). The rest of the pcb looks fine, also the capacitors and the surge arrester

look like they are in a good condition. I measured them all and found no serious deviations.

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Updated: front side

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Updated: faulty MOSFET K10A60D or C124

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Does anyone know what this part was to replace it or suffered the same problem and could help repairing it?

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Hi Tom A, do not just replace the fuse.

Most prob there are serious fault on the primary section of the PSU.

possible to share the front pics of it?

check on the bridge rectifier if it has been blown...... and couple of primary side IC, check if it is being shorted out.

cleanup those burnt smd components and restore them up.

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tengo un problema con un equipo igual, se quemo la salida y no se ve el numero.

Agradezco su respuesta.

I have a problem with a similar team, the output burned and the number is not seen. Thank you for your answer.

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@Raul Reyes ... Esta es una publicación vieja. es posible que desee crear el suyo propio para obtener mejores resultados. Veamos algunas fotos de tus tableros de potencia.

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I didn't manage to fix it. After weeks trying I sent it to a Marshall repair shop. They changed the PCU, I payd... End of the story.

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Hello, I have the same problem, to help solve the problem, would you have taken a picture of the card in good condition? to finally know the inductance of LL10 .... Thank you

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Hi,

L is the designation for an inductor. Unfortunately without a schematic or a parts list from the service manual (I can't find one) its’ value is unknown.

Inductors usually only blow or burn out if there is excess current flow through them so there is another fault on the board which caused this to happen

To the left of the inductor in the image you posted, below the R9 resistor there are 3 clean soldered component leads in a row. Check on the other side of the board what component is terminated there. It looks like some sort of IC or transistor lead configuration so check if it is short circuit.

The board is a wan nien E88653 psu but searching online for schematics for the board yielded no results, only wan nien E88653s shows up with no info about the actual circuit and it may be different anyway.

Hopefully this is a start until someone else responds.

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Hi Augustine, hi Jayeff,

thank you for your quick response. I also checked for scematics and also asked Marshall Headphones Inc. It was not possible to get any useful information. They just named a partner repair shop that would replace the psu with a spare one. I updated the pictures attached to that question.

I also checked the series of diodes (bridge rectifer) on the backside of the pcb. They seem to work fine, no short cirquits and no other burnt elements, but the two parallel SMD resistors marked as R100 next to the burnt inductor are just reading 0.2 Ohms. I think the mosfet K10A60D failed due overheating. This shorted the cirquit between the base and the collector line. There is also a chance, that C124 caused that problem but without knowledge about the burned inductor it would be useless to replace them.

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Hi,

SMD resistor code R100, resistance = 0.1 Ohms.

Is the C124 in circuit across the mosfet?

Unsolder 1 leg of the capacitor so it is out of circuit and measure across the mosfet and the capacitor and check what you get

Just had another thought, clean up the board where the "inductor' LL10 is and re check the designation. A slightly moist Q-Tip should suffice.

Was thinking that you said it was LL10 and it occurred to me ( a lot later - I'm getting old) that normally it would be L10 (if it was the 10th inductor on the entire circuit board which seems a lot especially for a small power board) and not LL10 so it didn't quite gel.

Check if it is actually designated U10, U means it is an IC .

Doesn't make it easier to know what it is though

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LL 10 = 2,7 uH

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Tom A. 님은 대단히 고마워 할 것입니다.
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