[PS2-SCPH77004] Modbo 750 doesn't read backup anymore.

Discussion in 'Modding and Hacking - Consoles and Electronics' started by Naitoraven951, Jul 19, 2016.

  1. Naitoraven951

    Naitoraven951 Active Member

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    Hi to everyone :).
    I recently received an SCPH-77004 (board : GH-052-51) with a modbo 750. This modchip was installed on December 2007 (so, i suppose before it works). But i doesn't read any type of backup (or import original games). It works DVD-Video and Original PAL games. Maybe the chip or wires are broken?
    Here's some pics :
    [​IMG]
    [​IMG]
    The connection looks like Ok (check with tester and there is connection)....maybe there is some fuse on the modchip?
    Thank you in advance and have a nice day :)!
     
  2. Colek

    Colek Spirited Member

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    Do you have multimeter? You could check fuses and connections with it.
     
  3. Naitoraven951

    Naitoraven951 Active Member

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    Hi colek, thank you for the prompt response :).
    Yeah, i found a fuses totally open (PS7 - 0,7AMP), i've changed the fuse but nothing. The console won't read the backup :/
    It could be a broken/burned modchip?
    Thanks!
     
  4. Mord.Fustang

    Mord.Fustang Fiery Member

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    It's possible the modchip is dead or one of the connections have come loose. Just because they look OK doesn't necessarily mean it's OK. PS2 installs can be very tricky. :)
     
  5. Naitoraven951

    Naitoraven951 Active Member

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    Hi there Mord.Fustang :)!
    Yeah, i check with the multimeter, the connection from the modbo on the board. All green... :/
    But, how a chip can be broken? Maybe to much voltage or something broken?
     
  6. AndehX

    AndehX You got boost power!

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    tbh, modbo chips are extremely cheap. I'd just replace it.
     
  7. Naitoraven951

    Naitoraven951 Active Member

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    Yep AndehX, modbo is bad modchip.
    What i want to know is : why this chip is broken? Maybe some overvoltage burn the chip?.
    I really don't know.
     
  8. voultar

    voultar Rapidly Rising Member

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    Time to replace that laser.
     
  9. AndehX

    AndehX You got boost power!

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    yeah to be honest, this sounds more like a laser fault. I agree, you should replace that too.
     
  10. Bad_Ad84

    Bad_Ad84 The Tick

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    He said it reads originals fine, but not original imports.

    If it were the laser being weak, imports should work too.
     
    Mord.Fustang likes this.
  11. voultar

    voultar Rapidly Rising Member

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    Oh, I read that as "backups" in my mind, for whatever reason.

    Go over points Y,B,G,H,I and A. Unlikely that it's shorting to something at this point, but could be a cold joint there that's finally given way.

    Seen that more times than I care to count.

    While you're in there, it certainly wouldn't hurt to beef up your ground and voltage supply.

    Though it's been installed that way for years, ground bounce is never good, up those two conductors by at least 28 AWG.
     
  12. Naitoraven951

    Naitoraven951 Active Member

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    Thank you guys for the response.
    Like Bad_Ad84 said, the laser is perfect. The backup wouldn't start because the mechacon read a false protection (so it's normal). Also i tested with a Swap Magic and it works prettly fine. So the modchip is the problem :)
    I check all connection and are OK, also the fuses. So think the Modchip is broken. The voltage on the chip is OK (3,43v). I stressed the wires on the motherboard and connection is very stable.
     
  13. Bad_Ad84

    Bad_Ad84 The Tick

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    When you boot the console and hold triangle and circle - can you get into the configuration menu?
     
  14. Naitoraven951

    Naitoraven951 Active Member

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    Hi Bad_Ad84 :)!
    Unfortunately, no. No menu screen and nothing about modbo 750 OS. Looks like the chip was never installed! :(
     
  15. Bad_Ad84

    Bad_Ad84 The Tick

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    Well if no menu, you either have bad bios wires, a power issue or the chip is dead.

    It's worth replacing the power lines as mentioned above with thicker wire.
     
  16. zzattack

    zzattack Spirited Member

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    Looks like a reasonably decent install if you ask me. Before outright replacing the chip, if I were you I'd verify the wiring using the diagram and your multimeter.

    Also, hit just the start button while turning on the console. It'll tell you 'modbo disabled' if install was successful.
     
  17. Naitoraven951

    Naitoraven951 Active Member

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    Sorry for the late response :p!
    So, after two days, i checked :
    1) Wires on the board (resoldered - tester OK)
    2) Wires on the modbo ( resoldered - tester OK)
    3) Voltage on modchip (3,43v)
    4) I press start or O/X button for activate/enter on Modbo's bios but.....nothing.
    5) check fuses (all OK)
    It's totally dead :(
    Maybe, with a soft mod can i play my backup :p....
     

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