Hardware Experiments

Discussion in 'Chihiro Development' started by tkeahi, Mar 1, 2014.

  1. tkeahi

    tkeahi Active Member

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    I have two Chihiros sitting on the workbench right now - one works, one doesn't. I've disassembled them and I'm playing with the xbox boards inside. I'll call them "1.1" and "1.3" since they look very similar to the retail xbox 1.1 and 1.3 boards (see the pictures thread). The 1.1 board has an unknown issue (FRAG) that I'm trying to figure out. Anyway, I'm creating this thread to share whatever interesting hardware discoveries I find in hopes that it helps the "Chihiro on xbox" project.

    First up: EEPROM dumps from the xbox boards:

    1.3:

    00000000 74 89 25 20 F7 9C 01 6A EC 03 54 30 91 57 95 5A t‰% ÷œ jì T0‘W•Z
    00000016 06 9A 40 29 50 57 7C 07 8E FA 54 06 D1 ED A6 06 š@)PW| ŽÃºT Ñí¦
    00000032 E5 02 E6 84 9D FA 64 01 86 28 4F 0E E0 9C 84 86 Ã¥ æ„ úd †(O àœ„†
    00000048 3A 8D 71 3C 34 33 30 32 30 30 33 33 34 34 35 35 : q<430200334455
    00000064 00 50 F2 DE D1 82 00 00 2E 90 C6 0C 66 FA C7 2D PòÞÑ‚ . Æ fúÇ-
    00000080 C2 15 FE 41 04 67 36 CD 00 01 40 00 00 00 00 00 Â þA g6à @
    00000096 3B 57 75 8E 00 00 00 00 00 00 00 00 00 00 00 00 ;WuŽ
    00000112 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000128 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000144 01 00 00 00 00 00 00 00 02 00 01 00 00 00 00 00
    00000160 00 00 00 00 00 00 00 00 C0 A8 89 70 00 00 00 00 ˬ‰p
    00000176 00 00 00 00 FF FF FF 00 02 00 00 00 00 00 00 00 ÿÿÿ
    00000192 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000208 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000224 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000240 00 00 00 00 00 00 00 00 00 00 07 00 04 01 00 00


    1.1:

    00000000 EC D7 11 3A DC 9C B3 1F D6 67 05 F4 4E C0 8A 82 ì× :ÃœœÂ³ Ög ôNÀŠ‚
    00000016 2B C0 EF 93 BE 58 A5 55 A9 58 C1 02 8E C7 7F 96 +ÀXÂ¥U©Xà ŽÃ‡ –
    00000032 CB 67 F6 31 12 08 E9 51 25 F1 9A E1 65 A9 F3 2D Ëgö1 éQ%ñšÃ¡e©ó-
    00000048 2D 57 53 E7 39 33 38 31 30 34 37 31 33 31 32 35 -WSç938104713125
    00000064 00 50 F2 DF 67 E8 00 00 86 1E 61 8D CB 4B 6D 54 Pòßgè † a ËKmT
    00000080 0C 32 DE D8 6E 3A 2B E6 00 01 40 00 00 00 00 00 2ÞØn:+æ @
    00000096 F2 FF FF FC 00 00 00 00 00 00 00 00 00 00 00 00 òÿÿü
    00000112 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000128 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000144 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000160 00 00 00 00 00 00 00 00 0A 00 00 03 00 00 00 00
    00000176 00 00 00 00 00 00 00 00 02 00 00 00 00 00 00 00
    00000192 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000208 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000224 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
    00000240 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00


    LiveInfo can't "read" these, which I guess is normal for debug eeproms. You can see some numbers above; the numbers match the ending digits on the motherboard sticker.

    I took the media boards and baseboard from the non-working chihiro and hooked them up with the working 1.3 board and the combo works fine. So it looks like the baseboard/media boards aren't "locked" to the individual xbox boards the way retail units are with their hard drives.
     

    Attached Files:

    Last edited: Mar 1, 2014
  2. JayFoxRox

    JayFoxRox Spirited Member

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    I assume that's the Xbox board EEPROM? The EEPROM is pretty small - instead of using pictures you should simply use a hex string, C array or something (Would also be easier for others to copy them)
    Also you should call them W (working) and NW (non-working) or something.
     
  3. tkeahi

    tkeahi Active Member

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    Today's random fact: On the Chihiro xbox boards the TSOP "write enable" points are already connected.

    I bought some modchips and as soon as they arrive I'm going to try chipping the Chihiro xbox board.
     
  4. XboxSurgeon

    XboxSurgeon Site Supporter Since 2013

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    I have four Chihiro boards rotting away in my closet.
     
  5. tkeahi

    tkeahi Active Member

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    AVIP Cable

    The Chihiro AVIP cable has modes 1, 2, and 3 grounded (when the other end is connected to the baseboard, that is).

    You can disconnect the Chihiro AVIP cable and hookup a homemade (1+2+3) VGA cable instead and the Chihiro will work as usual.

    With a 1+3 VGA cable the Chihiro menu will display normally but when attempting to start a game you'll get an error: "Caution 51 error: Wrong video output setting of horizontal scanning frequency."
     
  6. tkeahi

    tkeahi Active Member

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    Tonight's Menu: Baked Chihiro

    I recently purchased 3 non-working Chihiro xbox boards.

    One board FRAGs, so I removed all the electrolytic caps and tried baking the board at 385 degrees F to reflow the solder. After putting all the caps back on and testing it...it still FRAGs. It also made the whole kitchen smell funny.

    On the second non-working board I decided to try reflowing the GPU using my wife's embossing tool (craft-sized heat gun):

    EHT03 Marvy Embossing Heat Tool.gif

    Result? A fixed chihiro. Sweet.
     
  7. XboxSurgeon

    XboxSurgeon Site Supporter Since 2013

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    I'm very glad to hear at least one was fixable!
     
  8. tkeahi

    tkeahi Active Member

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    I'm happy too. I'm gonna try this technique on the other mobos tomorrow.

    Thanks for the easy sale and awesome packing and shipping.
     
  9. XboxSurgeon

    XboxSurgeon Site Supporter Since 2013

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    No problem. I'm just glad someone got some use out of them.
     

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