This is a motherboard from ASUS G75VW laptop. What are these 3 parts? When I put the battery in the laptop, after several minutes it turns off and these parts are burnt. I had a second MB and replaced them, now use the laptop without the battery.

The parts are placed immediately after the power connector.

Maybe I should replace them with higher values, or what can you suggest?

enter image description here

  • Where is the photo?
    – Wesley Lee
    Feb 4 '17 at 23:55
  • Forgot it :) Here is it.
    – Roman Simonyan
    Feb 4 '17 at 23:57

The parts are ferrite beads. If they are burning up then something is horribly wrong on the other side of them (probably shorted MOSFETs and maybe worse).

Oops. Make that "definitely worse"- the ON Semi Schottky diode (probably) visible in your photo is obviously FUBAR.

You are not likely going to be able to fix this very easily given your current level of knowledge- take it to a repair person.

  • Can you suggest the replacements' characteristics?
    – Roman Simonyan
    Feb 5 '17 at 0:02
  • 1
    You could measure the case size and if you know the current, pick a suitable replacement. If they measure almost a short from end to end they are still functional as conductors anyway (their purpose is just to reduce EMI). But other things are obviously wrong and replacing them can only cause additional damage at this point. Feb 5 '17 at 0:20
  • 3
    Replacement characteristics won't help. From croocked soldering it is obvious that somebody already tried to replace the parts. The problem is somewhere else that caused these parts to burn. Unless you determine where the actual problem is (short in some blown IC), replacement won't help. Feb 5 '17 at 0:22
  • 3
    As I wrote above- there are SERIOUS PROBLEMS. The diode has a crater in the package where the die used to be. Do whatever you like, it's your laptop. Feb 5 '17 at 1:58
  • 1
    @RomanSimonyan, This is not serious. You need to have full schematics to repair this board, because reverse engineering of 12/16-layer board would be quite challenging, and usually the whole logic around battery charging is quite convoluted. Just throw the board away and find something more useful to do. Feb 5 '17 at 5:41

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