Comments on: Repairing SSBright SG-SM129D FM/USB/Line In SET

By: Gerald

Gerald — Wed, 02 Nov 2016 04:49:04 +0000

Hi Parasuraman, thanks for sharing this heroic repair. Most people don't read the warnings on back panels. I can imagine someone with the earphones on, in a wet environment.. frightening.

Cheers,
GM

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By: Robert Calk

Robert Calk — Wed, 02 Nov 2016 00:33:42 +0000

Thanks for the article, Parasuraman. It will be easier to check the SOT-23 components with this little adapter from Peak Atlas: http://www.peakelec.co.uk/acatalog/pca23-sot23-test-adapter.html

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By: Mark

Mark — Tue, 01 Nov 2016 21:52:55 +0000

Thanks Parasuraman,

As usual your patience & persistence has paid off.
Well done!

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By: Bulent NUR

Bulent NUR — Tue, 01 Nov 2016 15:54:06 +0000

Nice repair thank yoo

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By: Humberto

Humberto — Tue, 01 Nov 2016 15:07:55 +0000

Hi Parasuraman, good repair and nice explanations.

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By: Yogesh Panchal

Yogesh Panchal — Tue, 01 Nov 2016 14:30:02 +0000

Good Job! Sir.

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By: suranga Electronics

suranga Electronics — Tue, 01 Nov 2016 09:59:16 +0000

Mr, Parasuraman.

Good Fault finding and SMD Replacement.

very good Job !

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By: Paris Azis

Paris Azis — Tue, 01 Nov 2016 09:40:35 +0000

In reply to Albert van Bemmelen.

Hi Albert

The tricky effect with this type of power supply is that it is not so dangerous when it works fine. This is due the fact that, despite the direct capacitor's connection to the mains, the output voltage is pulled down by the load and kept there in very low levels,usually under 12V. The problem exists when the output is open-circuit or the capacitor gets shorted. In this first case the full line voltage is there,at the output, with the capacitor's role being to just limit the output current to a low level, while in the second case there is no current limit at all and all depends upon the line fuse...
Therefore, although the normal output current level of these supplies is usually of the order of no more than 100mA, it can be fatal. Home RCDS are tripped at 30mA...
This finally means that, overall, your comment about installing such a power supply in a consumer appliance, at least without a warning for the user, is not right at all. I certainly agree with that.

Best Regards

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By: Paris Azis

Paris Azis — Tue, 01 Nov 2016 09:04:36 +0000

In reply to Albert van Bemmelen.

Nice modification Parasuraman, as regards the mosfet replacement. I like it.

Best Regards

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By: sudhir

sudhir — Tue, 01 Nov 2016 08:52:39 +0000

Great Artical Mr Subramanian
I liked the part where smd part are replaced and modified.
very detailed explanation and nicely presented.

Thank you for this post.

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