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How to solder PLCC socket with surface mount contacts?

Discussion in 'Electronic Repair' started by larry moe 'n curly, Jul 3, 2005.

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  1. I want to put my motherboard 32-pin PLCC BIOS chips into sockets so I
    can hot flash them if they somehow get erased, as many of them have,
    but how cam I solder those sockets to the circuit board without special
    equipment? It seems that their surface mount contacts are inside the
    perimeter.
     
  2. Simply, you probably can't. The board is likely multi-layered.

    Tom
     
  3. Unless the motherboard was explicitly laid out with the foil pattern for PLCC sockets,
    you're pretty much SoL.

    How is it that you came to believe E2PROMs can "somehow get erased?" As I recall, most
    modern motherboard with FLASH update capability require that a hardware jumper be manually
    set before they will allow any writing to the chips.

    Keep the peace(es).
     
  4. Static electricity...power surge? Chernobyl virus, before the
    jumpering practice began, I think...

    Tom
     
  5. Inty

    Inty Guest

    I use the "hot-flashing" consisting in removing the bad programmed chip,
    insert it in a working mobo, removing the flash from the working, inserting
    the bad programmed chip, and flash it, from dos using uniflash !

    I.
     
  6. But the surface mount socket mounts on the surface, doesn't it? I
    already unsoldered the BIOS chip (solder wick and a double-edge razor)
    and can see all the solder pads.
     
  7. It is laid out that way, and the motherboard working again with the
    BIOS chip held in place with a clothespin.
    I ran NEC's Windows-based program to flash one of their DVD recorders
    (ND-2500A) and then power-down the computer, but when I turned the
    machine back on, there was none of the usual boot-up activity, except
    for the keyboard lights blinking. All the major voltages (+5.0V,
    +3.3V, +12V, CPU core, DDR memory, AGP socket) measured right, the CPU
    worked fine in another mobo, and I didn't see or smell anything funny.
    Also this ECS K7VTA3 mobo has no BIOS protection jumper or a setup
    feature to prevent BIOS writing.
     
  8. I'm sure the erasure was caused by NEC's Windows-based flash program
    for their ND-2500A DVD writer because when I ran UniFlash to hot flash
    the mobo BIOS chip, I had the chip's contents written to a file, and
    that file looks like the NEC DVD writer's BIOS. The DVD writer did get
    updated though.
     
  9. Uniflash was a lifesaver for me because Award/Phoenix's flash program
    refused to let me flash the "wrong" BIOS.
     
  10. Inty

    Inty Guest

    Why did you flash any bios via Windows ? Why didn't you flash via a boot
    disk with DOS, UNIFLASH and the relative .BIN fiel ?

    I.
     
  11. Inty wrote:

    "larry moe 'n curly" <> ha scritto nel
    messaggio
    I was trying to flash the DVD writer's BIOS, not the motherboard's, and
    the drive's maker, NEC, provided a Windows-based flasher program that
    somehow managed to write the motherboard's BIOS as well. I later
    learned that they have DOS-based flasher.
     
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