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LJCTX49

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11 years ago

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LJCTX49

5 Posts

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25385

October 13th, 2015 20:00

INSPIRON 3847 No Power

Stopped working. Will not restart. Removed all external connections. Unplug and held button down still nothing. Pushed PSU BIST button and got green light. Disconnected all power supply connections and reconnected one at a time .PSU light comes on. Reconnected all internals. NOW WHEN I PRESS PSU BUTTON THE FRONT POWER BUTTON LIGHTS UP WHITE .However shuts off when I release the PSU BUTTON. What should I try next?

  • DELL-Hemalatha

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    Posted October 14th, 2015 03:00

    Hi, 

    When you say that you disconnected all power supply connections, are we talking about memory, hard drive, graphics card if any??

    Does the machine stays on without the internal components??

    Regards

  • SwampYanqui

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    Posted October 14th, 2015 04:00

    What you have described sounds similar to what I experienced on my Inspiron 620. The solution for my Inspiron 620 turned out to be simple and cheap: replace the motherboard battery. Read the thread to see how it compares with your situation.

    en.community.dell.com/.../19656456

  • LJCTX49

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    Posted October 14th, 2015 06:00

    I disconnected all cables coming out of the Power Supply unit. The machine does not stay on. Front button only lights up when I hold down the rear PSU button. Also both fans run when I hold down the PSU rear button.

  • LJCTX49

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    Posted October 14th, 2015 06:00

    If you are referring to the BIOS memory battery, yes I did change it out last night. No difference.

    Is there anoher battery on the main board?

  • LJCTX49

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    Posted October 14th, 2015 07:00

    Is it possible that the front button circuit is broken? How do I test that?

  • DELL-Hemalatha

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    Posted October 15th, 2015 00:00

    You can try removing the front panel and try to turn on with the physical button underneath, if still the same, then first you can try to replace the button, if not the motherbaord.

  • speedstep

    11 Legend

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    46969 Posts

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    Posted October 15th, 2015 07:00

    If the Green Light BIST goes off when pressing the button on the back the power supply is bad.

  • LJCTX49

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    Posted October 15th, 2015 15:00

    The Green light BIST stays on.

    The front power button lights up only when I push the rear BIST button.