Comments on: Repair of a switching power adapter without any switching controller chip!!

By: Albert van Bemmelen

Albert van Bemmelen — Sun, 18 Oct 2015 08:43:17 +0000

Probably the best way I do it, is by first drawing the positions of all components onto a new white sheet of paper. And next use another pencil or another colour to add the copper layout connections to it. This way you have an exact copy of your electronic device you are repairing on paper, in which you also can add all component's values. And when you are ready with this you are also able to draw the circuit with the components in it with their electronic symbols. From which you easily can see how everything functions.

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By: Taring K Arioka

Taring K Arioka — Wed, 13 May 2015 16:54:49 +0000

It is good to learn that it is possible to draw diagrams from the pcb. I will try that. Hope it will be quite easy.

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By: Lee

Lee — Wed, 06 May 2015 12:39:24 +0000

Nice repair and thanks for that "Uni-Rapide Super Gel from Pattex" quick glue tip.
What other crazy glue would you guys recommend? I need a good brand in bottle and not the tube type that drip, dry and is "one time usable"...

Thanks.
Lee

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By: Albert

Albert — Wed, 06 May 2015 06:39:35 +0000

In reply to sam montero.

Hi Sam, you are right of course to also name the opto-coupler an active component. But it doesn't oscillate energy into the primary coil and also is part of the secondary circuit. But indeed if it is defect nothing works, also when the txtor is on the secondary side is defect.

I have found a really easy tester for the optocouplers. See for instance this link on Ebay for this great hardware tool:

http://www.ebay.com/itm/Multi-Function-IC-LED-Optocoupler-LM399-DIP-CHIP-TESTER-Model-Number-Detector-/251549975540?pt=LH_DefaultDomain_0&hash=item3a918c03f4
(No shipping costs either ! And also very affordable).

It works on only one NiMH battery and also can test nearly all your TTL/CMOS or Leds and Displays, and even some other parts like Op-amps and Amplifiers!

I bought it a few months ago and think it is a terrific very portable peace of hardware to help in the aid of checking these special Power Supply components.

Cheers,
Albert.

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By: Albert

Albert — Tue, 05 May 2015 20:41:09 +0000

In reply to Florin.

Did you count them ?

Think of them as KA-CHING! and you're rich Haha !
But I'll try to chill on the 'you know what' if it makes you feel better...

Have a nice day Florin EXCLAMATION POINT.
Albert.

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By: sam montero

sam montero — Tue, 05 May 2015 13:02:54 +0000

Hi Albert
The way you described the circuit, there is three active components.This is 13007, 8050 and the optocoupler with a txtor on the primary side.
The 13007 you could get it free from a defective electonic balast lamp. Just a tip.

Sam

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By: Chris

Chris — Tue, 05 May 2015 05:48:17 +0000

Good job Albert!
Congratulations.

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By: Humberto

Humberto — Mon, 04 May 2015 12:07:54 +0000

Congratulations Albert, with your repair another PSU was saved from the dump.

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By: Florin

Florin — Mon, 04 May 2015 06:16:22 +0000

Albert,
I think the key for the exclamation point on your keyboard is worn out from heavy use...
Chill.

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By: Robert Calk

Robert Calk — Sun, 03 May 2015 12:40:15 +0000

In reply to Albert.

Good job Albert. I was going to ask you if you used the fantastic Blue Ring tester to test the transformer! DMM's are not good enough for proper testing since you can have an internal short and not know it just using a DMM.

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