84Views8Replies

Author Options:

AC to DC adapter/charger output giving little sock Answered

My new AC to DC adapter/charger output giving little sock.
And, when I use a AC tester on it, tester light up (like Ac line).

This adapter use "Ferrite core transformer".
Also, checked a "Iron core tranformer" Adapter, Also, some of branded mobile charger lighten up the AC tester slightly, but not giving shock...

Is there any option to fix this problem...?
Output is a 12.75V/1.2A. (Loads are working Perfectly) But, the body current is the problem.
There are no any short-circuit. Giving some pix...
(If you need full circuit diagram, Please inform, that may takes some time).

Discussions

0
None
-max-

Best Answer 3 years ago

To fix it follow these simple steps:

Step 1) Get the necessary tools. (a hammer, hard surface, and trash can)

Step 2) Yell "YOU NEARLY KILLED ME!!!!"

Step 3) violently smash that power adaptor as many times as you see fit'

Step 4) (optional): Will it blend, that is the question! Blend it into dust.

Step 5) destroy all remnants of it and dispose of the coal.

Step 6) Buy a better power adaptor from a reputable company

Step 7) Be thankful it only shocked you not electrocuted you.

0
None
arnablue-max-

Answer 3 years ago

You Won the Best answer Award. :D

Just Bought a New Adapter from local.
And It working Great without any problem.

Now, going to follow your DIY
step-by-step.

(Just Step 6 will be different. Bought the same Brand)...
:P

0
None
-max-arnablue

Answer 3 years ago

Thanks! But I really would still not trust that brand. Clearly the company that made the power supply has NO idea how to properly design one, or simply don't care. Treat the output even on the new one as if it was live with 240V.

0
None
arnablue-max-

Answer 3 years ago

Okay... :D

This is a common answer I found everywhere on web.

But, I want to fix this Adapter...
I found, many of adapter gives little shock... If you've contact with ground.

Some of branded product also.

And it's happens only on adapters using "ferrite-cored transformers"...!!!!

0
None
-max-arnablue

Answer 3 years ago

I have never had a switch mode power supply based power supply like this shock me. with the exception of a hacked xbox power supply, where the output was weakly capacitively coupled to AC. I repaired it as the EMI shield had a dry solder joint and that seemed to have fixed it.

That said, these smaller adaptors are so cheap they really are not worth repairing unless you need a quick and dirty temporary solution while you wait for a replacement part to come. In fact, it looks like it is flawed by design. That means there is nothing you can do to make it safe. It is poorly designed by people who clearly do not give a sh*t about your life. If you absolutely must use it, to try to make it a little safer, you can try plugging it in upside down and doing the neon light test again.

Looking at the circuit board, There is like NO creepage between the dangerous 240V side and the "safe" low voltage isolated side. In fact, it appears that there is NO isolation at ALL. I see a small thin trace along the bottom edge running down pretty far into the low voltage side. The creepage is like 1.5mm, 310V peak voltage can easily bridge that gap.




0
None
arnablue

3 years ago

Update:

IMG_20160412_151309.jpg
0
None
Downunder35m

3 years ago

Cheap, nasty, no real safety.
Discard in a bin a get a proper one.
Best option IMHO...

0
None
arnabluerickharris

Answer 3 years ago

I can't say, it's because of cheap product. Cause many branded adapter has this issue...

My 30v HP printer adapter also gives little sock.

And, In India this is a common problem. Here hard to find a good branded Product Accessories.

Also, In Rainy season... Every electronic product giving shock... (If not grounded)... :P

0
None
rickharris

3 years ago

Almost certainly the transformer is faulty, however there ia a capacitor across the transformer which may be the problem as well.

poor design, the mains on such adapters should be isolated from the low voltage side for safety alone.