Dell E5470 LA-C631p - Short removed now turns on but no post/display

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  • retrorepair2
    Senior Member
    • Feb 2023
    • 88
    • United Kingdom

    #1

    Dell E5470 LA-C631p - Short removed now turns on but no post/display

    Got a really frustrating issue here, got a Dell laptop as above which initially had a short on the +POWER_SRC rail, discovered a short cap in a bank of 3 near PU801. Removed and verified the short was gone, it was and the laptop powered on, tried to load windows but just kept rebooting. Sometimes didn't post. Battery was charging.

    Stripped it back down and replaced the cap (assumed looking at the LA-632p schematic it's a 10U cap, no boardview so who really knows). Now the board doesn't charge the battery and while it powers on with a brief spin of the fans, there's no display on the internal lcd or external via hdmi and no post. Stays on for 60 secs then turns off.

    I'm losing my mind with this one, all seems fine and can't find another short, the display test works fine, I get an error with no RAM (blinking orange/white led) and power button turns it off with a brief spin of the fan.

    CPU gets warm, not hot.

    I can't find any missing voltages. Help please
  • retrorepair2
    Senior Member
    • Feb 2023
    • 88
    • United Kingdom

    #2
    Any ideas would be very much appreciated, at a complete loss here. Have removed the cap I replaced not that I really suspect that was an issue. No change

    Maybe corrupt bios? Just don't get why it worked before I replaced that cap and now refuses to post at all. No idea where to go from here but really could do with this working.

    Comment

    • mon2
      Badcaps Legend
      • Dec 2019
      • 14613
      • Canada

      #3
      Test the voltage of the RTC (real time clock) battery. Often it will be a CR2032 coin cell type. Be sure this is ~3v else must be replaced.

      Comment

      • retrorepair2
        Senior Member
        • Feb 2023
        • 88
        • United Kingdom

        #4
        Thank you for the reply. Would that cause this issue? It's 2.9v so a bit low but assumed these are rechargable? I've seen videos of people booting the motherboard without it (or even the fan).

        Comment

        • lapfix
          Badcaps Legend
          • Mar 2020
          • 2755
          • my workshop

          #5
          I get an error with no RAM (blinking orange/white led) : how much !
          LA-C631p is similir to LA-C621P :
          Brd : https://www.badcaps.net/forum/troubl...65#post1669965

          i guess that you have try a trusted ram at different slot!

          Comment

          • retrorepair2
            Senior Member
            • Feb 2023
            • 88
            • United Kingdom

            #6
            They are similar but not the same. At least in layout. Yes tried in a different slot and RAM tests good

            Comment

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