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High voltage fuse blowing immediately

Hi,

My Sonos Play 5 (Gen 1) is blowing the internal high voltage fuse immediately when i'm turning the power on. Anybody who can assist with a schematic of the PCB or any who have seen this kind of problem before?

Block Image

For info, I'm currently sitting on the northsea on a olieplatform and there is a bit lack of spare parts. But i have the most standards parts.

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@laversen disassemble it and post some images of the boards with your question. That would allow us to see what you see and maybe even see something abnormal. Use this guide or that Adding images to an existing question

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@oldturkey03, The post have been updated.

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Is the repair has been successful? What was damaged ?

I have the some problem

Fuse blown

I look on the diode bridge , but shorts is on the pcb d27718 pin 1 to 3. No shorts on the diode.

Thanks for any help.

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Same problem! But were can I find the fuse?

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Hi @ ceeskoedijk,

Do you mean where is the fuse located on the board?

If you look at the image posted above the glass fuse is on the board just above the power input socket.

If you mean what value is the fuse and where do you get it?

Remove the fuse and check what is stamped on the metal ends. There will be a Voltage (V) and Current (A) rating and if it has a T (indicates slow blow)

Also measure the length and diameter of the fuse cartridge

Once you have all the information search online for a (insert values ) fuse to get results and then check for one that has those values with the correct physical size.

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It sounds like a problem in the power supply section. An electrolytic capacitor with a domed top or showing signs of leakage will hopefully give you a quick win, but otherwise my guess would be the rectifier or switching transistor on the high voltage side.

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Also what i was looking into at first.

At first I changed the big capacitors, no help. After i wrote the post yesterday I have changed the diode bridge, it's was shorted, now the fuse don't blow. But it still dosen't shows any signs of life.

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Next would be the switching transistor on a heatsink just south of the transformer in your photo. There's also an 8-pin IC down that way, and if you can identify and replace that it'd be worth doing. And I can see 6 surface mount transistors. These will have abbreviated type codes. If you can identify them as junction transistors you can test them (more or less) in situ with the diode range of a multimeter, and whatever they are, a short between any 2 terminals would point to trouble.

I had a glance at Google for schematics but found nothing. Sometimes you can have more success with yandex.ru or baidu.com though a quick look didn't come up with anything.

Hey, if you're on an oil platform I'd guess that a power surge created by some heavy electrical machinery might be what has done the damage.

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