P4C800 deluxe memory problem

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  • jlavi
    New Member
    • May 2008
    • 3

    #1

    P4C800 deluxe memory problem

    I've over 4 years old P4c800 deluxe motherboard which has been
    running 24x7 last 4 years. It has 8 OST RLXes as VRM output filter
    and about 20 OST RLS here and there.

    The machine booted itself and failed POST by saying "bad bios
    checksum". I have 4 pieces of Kigston 1GB 400MHZ ECC DDR dimms
    and one of them seems to have failed. Normally I would just order
    a new DIMM and continue using the board without giving a second
    thought.

    However, now having reads warnings about OST caps, I consider
    recapping the board or having it recapped, even if it seems to
    work -- except that one memory DIMMS has now broken. I've had
    reasonably well ventilated Antec case and CPU temp has usually
    been 30 degress Celsius or slightly abobe and the same for hard
    drives. Still, the airflow aroud memory banks may not have been
    that good because of the cables and case structure blockking
    flow.

    Here a some pics of the caps. I don't see real bulding, but many caps
    have 4 hang-gliders like vents, which was discussed in
    the thread Asus TUSL2-C Ost recapping.

    OST RLXes VRM output

    Memory bank

    Another memory bank cap

    Another memory bank cap

    One more close to the memory bank

    Clock generator

    Caps near AGP slot
  • bgavin
    Badcaps Legend
    • Jan 2007
    • 1355

    #2
    Re: P4C800 deluxe memory problem

    Recap everything from 470uF and up. Use premium caps. Buy them here from the board owner (Topcat). He has everything you need to do a first-class job.

    If you have not recapped before, read the Stickies on soldering tips. Read and Understand. There is a wealth of knowledge here. If you are a product of Sacramento Public Schools, have somebody read to you. There are no Books on Tape for the stickies...

    Comment

    • jlavi
      New Member
      • May 2008
      • 3

      #3
      Re: P4C800 deluxe memory problem

      Thanks for the reply. I have previous soldering experience but to
      save time I asked a quote from local service, but they did not
      bother to aswer. I am located in Finland, so Topcat's service is
      not available.

      I've tried cleaning holes with needle on a junk board with
      employers JBC pro soldering station. This works, but cleaning tin
      from the other size needs extra work.

      I then bought Weller desoldering iron with my employers expense.
      Already with a little testing I can say the device is
      fantastic. Removing cap lead and cleaning the hole in a single
      heating in 5 seconds, no tin residues and minimal stress on PCB.

      I am going to replace 1500 uF 6.4V OST RLXes with the same value
      Panasonic FMs and 1000 uF 6.3V OST RLSes with Panasonic FKs or
      FMs. I am still waiting for some Panasonic FMs to arrive.

      Before removing the caps I am testing with Memtest86 if it was
      just one bad memory DIMM. With broken dimm replaced and 4 dimms
      inserted the slot 0 (closest to CPU and NB) gives large number of
      recoverable ECC errors, about 3000 erros per hour and about 5-10
      non recoverable errors per hour. Switching dimms between bank 0
      and another bank made no effect, and errors repeated on slot 0,
      so sounds like a power problem in slot 0.
      Last edited by jlavi; 06-17-2008, 06:16 AM.

      Comment

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