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Thread: Flashing the 37

  1. #1
    Join Date
    Feb 2003
    Posts
    155

    Flashing the 37

    FYI:
    I have extensivly investigated the possibility of onboard flashing and have come to the conclusion it can not be done. Even if you hot A9 and OE up to 12 volts, the MMU will not provide a long enough write pulse to initiate a program cycle. The 39 uses an internal write timing generator that the 37 does not have. Boundry scan contact points are available under the main PCB and the Mips chip supports it but it seems the MMU does not.

    What to do?
    Lay a piece of tinfoil on top of the prom and circuit board, cut a small window with an exacto to just expose the prom. Blast it with a heatgun (like for removing paint) while gently prying up the chip. The tinfoil protects other parts from coming loose. Make a little air funnel out of foil to help focus the heat onto the chip.

    Clean up the pads and solder a socket in. It helps to remove the bottom of the sockets plastic frame when soldering the socket in with a fine tipped iron.

  2. #2
    Join Date
    Sep 2003
    Location
    NY
    Posts
    89

    Re: Flashing the 37

    On a crude level, yes, and pray you don't desolder and move any surrounding compnents. There are a few rather close by. A true SMT rework station is the ticket.

    I'd opt for the wire-wrap trick long before using a Heat Gun. (a SMT rework, you can adjust the temp and airflow independently, and use a 'tip' that FITS the chip correctly and doesn't pump heat onto the top of it)

    Wire-wrap trick:
    -Use a piece of wire-wrap wire stripped. loop around a single lead/pin.

    -Heat with a very fine tip soldering iorn.

    -As it melts, pule the wire under the lead.

    -Repeat 31 more times for the rest of the leads/pins.

    OR, go the easier/cheaper/quicker route. Send it to Kraven.






    Originally posted by Tiros
    What to do?
    Lay a piece of tinfoil on top of the prom and circuit board, cut a small window with an exacto to just expose the prom. Blast it with a heatgun (like for removing paint) while gently prying up the chip. The tinfoil protects other parts from coming loose. Make a little air funnel out of foil to help focus the heat onto the chip.

    Clean up the pads and solder a socket in. It helps to remove the bottom of the sockets plastic frame when soldering the socket in with a fine tipped iron.
    Dave
    -----------------------------
    Life's a reach, then you gybe
    Hacks -SA 2 PROM, telnet, ftpd, tivoweb, tserver, mfs_ftp, & extraction
    SA2.5 PROM - telnet, ftpd, tserver (waiting for a tivoapp patch)

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