I burned this small board "USB Car charger"

Discussion in 'General Electronics Chat' started by parmaja, Nov 10, 2014.

  1. parmaja

    Thread Starter Active Member

    Jul 2, 2008
    37
    0
    I bought a usb car charger to use it on my battery, it is worked fine with me before i decided to sold a small wire inside it,
    After soldering, it not work, and the chip 34063 heat up i cant touch it.
    I need to know what happed before buying new one and redo it again.

    this the board
    https://twitter.com/zaherdirkey/status/530725182130753537

    i think this similar to it
    http://320volt.com/en/mc34063a-ile-5volt-usb-oto-sarj-kiti-12v-24v-giris/

    I used 40w solder
    I touched it
    I resoled the inductor to move down for more fit

    What you suggest that I have made?

    Thank you in advance.

    -forgive me for my bad English-
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,148
    3,058
    Can you post a photograph of your work?
    Examine your work with a magnifying glass. It sounds to me like you have caused a short.
    It's possible the heat from your iron caused damage to the chip.
     
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  3. ISB123

    Well-Known Member

    May 21, 2014
    1,239
    527
    I think that you shorted it.Voltage regulators get very hot when they go in short circuit protection mode.
     
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  4. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
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    Buy another in the Pound shop - and don't break it again.
     
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  5. parmaja

    Thread Starter Active Member

    Jul 2, 2008
    37
    0
    Thank you, next time i will be careful using my gun, i will add cooler clip to the chip when soldering. and trying to not touch it.
     
  6. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
    784
    Unless you're using one of those big heavy instant heat soldering guns, there's relatively little chance of cooking modern silicon devices.

    Those soldering guns also magnetically induce destructive current flows in low impedance circuits.

    Those USB chargers are usually pretty small - which increases the risk of solder bridges between tracks if you're not careful.

    If the chip got too hot to touch, its almost certainly "toast".
     
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  7. parmaja

    Thread Starter Active Member

    Jul 2, 2008
    37
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    Oh yes, I noticed when i soldering another circuit have a led, the led flicking while soldering, I think i have bad gun.

    this is my solder
    http://snag.gy/u3oeK.jpg

    Thank you.

    >If the chip got too hot to touch, its almost certainly "toast".

    Yes toasted.
     
  8. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
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    That Iron shouldn't cause any particular problems.

    The soldering gun I was talking about is a big block with a transformer in it, that drives a hairpin shaped copper element with low voltage - but huge current.

    That loop of copper carrying high current can induce current in low impedance circuits.

    If the iron pictured is making a LED flicker, you're soldering on a powered circuit - a sure fire way to blow stuff up!
     
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  9. parmaja

    Thread Starter Active Member

    Jul 2, 2008
    37
    0
    No not powered circuit it is a ruler of 1 watt leds (with resestors).
    How can i test if my solder pass a power to the circuit?
     
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