Something in my laptop died

Discussion in 'General Electronics Chat' started by Albert Bubbles, Apr 17, 2015.

  1. Albert Bubbles

    Thread Starter New Member

    Apr 17, 2015
    2
    0
    Hi, hoping someone can help...
    The air vent next to the power jack in my Samsung NP305E7A emitted some smoke and a burning smell (possibly related to it having been dropped a few weeks previous)...the laptop continued to function fine except that it won`t charge anymore. Took it to a fella who tested the power cable/brick, said they worked OK so obviously something inside shorted. He reckons the motherboard probably needs replacing (expensive)...is there any chance it could be repaired without replacing the motherboard? Is it possible replacing the power jack socket may do the trick? I`ve attached a photo in case it`s of any use (power jack top left).
    Any help massively appreciated!
    Cheers.

    1.jpg
     
  2. DerStrom8

    Well-Known Member

    Feb 20, 2011
    2,428
    1,328
    Could you take a close-up of the board around the charging jack? I expect it was one of the caps or charging controller chips that fried, but we won't know until we get a clear close-up of that area.
     
  3. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
    784
    If its let the magic smoke out - you may want to check out the free recycling groups to see if anyone's getting rid of a laptop.

    Usually when someone posts something like that, they get a deluge of people wanting it - you may have better luck posting a wanted for one and hope someone replys.
     
  4. Albert Bubbles

    Thread Starter New Member

    Apr 17, 2015
    2
    0
    Thanks for the replies! Attached a couple of close-ups here...
    20150421_145438.jpg 20150421_145254.jpg
     
  5. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,055
    I haven't looked at a lot, but the few laptops I've looked at have the power control MOSFETs directly on the motherboard and the odds of a DIY repair are very low. It's essentially impossible to find schematics, so you're in the dark.

    Skilled shops can do the repair, but in my experience it was more economical to sell the laptop as-is (with a clear description of what you know about it) and then just buy a similar working model. I was surprised I could sell a damaged one for only ~$30 less than I could buy a working one. No way I could have gotten that repair done for $30.
     
  6. ian field

    Distinguished Member

    Oct 27, 2012
    4,415
    784
    A well known auction site might be just the ticket - someone may want a scrap one to break for parts (eg; the LCD etc).

    Always worth a look there for a working item at a reasonable price, but don't rule out free recycling groups - nothing ventured, nothing gained.
     
  7. Gdrumm

    Distinguished Member

    Aug 29, 2008
    684
    36
    Please clarify:
    1. It will run (when plugged into the wall), but it will not charge the battery?

    If it's #1, have you checked the battery?
    Can you remove the battery from the PC, and wire it directly up to the charger?
    (kinda tedious, but do-able)
    Usually, the center pin is +, and the outer jacket is -.

    In a crunch, I'll bet you could make it work (off of the battery).
    A spare battery for an NP305 on ebay list for less than $14.00, with free shipping.

    If you could rig up an external charging device (without damaging your battery or charger), then you could buy a spare, and always keep one charged.

    If the obejective is to have a pefectly working laptop, then you might have to go with the guy who said it's the MB.
     
  8. wayneh

    Expert

    Sep 9, 2010
    12,145
    3,055
    I had a very similar situation a while back. I was able to find an almost identical laptop nearby on e-bay or craigslist. I used the various combinations of charger, battery, and cpu to narrow in on the problem. One cpu would run off battery but could neither charge a battery nor run off the adapter.

    As I said, I sold it with full disclosure of my findings and it sold at only a ~$30 discount to the fully working model, which I also sold when the project was done.

    I had researched various options including DIY repair or a MB repair service. Nothing was worth bothering over just to gain the $30.
     
Loading...