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i have an old mp3 device , by wrong i supplied a high volts to it through the battery place, Now it isn't work .

By guessing . Which part of it's board has affected by this high power, to replace it?

Thank you

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closed as off-topic by PeterJ, Leon Heller, Dave Tweed Jun 23 '14 at 11:44

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "Questions on the repair of consumer electronics, appliances, or other devices must involve specific troubleshooting steps and demonstrate a good understanding of the underlying design of the device being repaired. See also: Is asking on how to fix a faulty circuit on topic?" – PeterJ, Leon Heller, Dave Tweed
If this question can be reworded to fit the rules in the help center, please edit the question.

  • \$\begingroup\$ can you upload its PCB image? \$\endgroup\$ – Adi Jun 23 '14 at 10:53
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It's impossible to say. It may be that the board has protection devices or it may be that it doesn't. Without inspecting the device you can't really draw any conclusions. The level of damage is also dependent on how high a voltage you applied - if you applied a few hundred volts, there's probably no hope at all.

Open the MP3 player up and look at the PCB and try and trace the path from where you applied the voltage to the components. A multimeter will be useful to check continuity. If you're lucky, there will be an obvious IC (perhaps a voltage regulator or battery management IC) which has been destroyed. If you're unlucky the damage could be incredibly widespread.

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