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Thread: Toshiba T4700 CT repair.

  1. #1

    Default Toshiba T4700 CT repair.

    I had this laptop not used for years. Recently I tried to boot it, and no success. I got a black screen.It seems that error code (p30) is exactly like in this article:
    https://www.vobarian.com/toshibaProblem.html

    Now I need to find somebody who would be able to de solder that cap. I have no experience with this laptop, I don't even know how to open it. Did anyway tried to fix such issue and would be willing to help me?

  2. #2
    Join Date
    Jan 2013
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    Marietta, GA
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    I've got one of those in my project pile, and I never could figure out how to get it apart either.

    Mine booted the last time I tired it but the built-in screen only showed all white.

  3. #3

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    At least I'm not alone

  4. #4
    Join Date
    May 2006
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    Melbourne, Australia
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    6,307

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    Quote Originally Posted by Niezgodka View Post
    ..., I don't even know how to open it.
    Quote Originally Posted by SomeGuy View Post
    I've got one of those in my project pile, and I never could figure out how to get it apart either.
    The maintenance manual for the T4700CT is at [here].
    The description of chapter 4 includes, "This section explains how to disassemble the T4700CS/T4700CT/T4800CT"

  5. #5

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    I did this with a T4600C. Fixing the specific capacitor fixed the P30 issue for me. In order to get to the PSU, follow the maintenance manual and document well, best with photos (I didn't...). I had to take almost the whole machine apart, which took a lot of patience and time. The soldering itself was not particularly hard.

    However, if I leave the machine connected to power, it will eventually (after some hours) turn on by itself. Pressing the power button won't do anything, the system can't be turned off unless I remove power again. Reconnecting power will turn on the computer instantly - if I let it sit a few hours without power, it won't turn on until a few hours have passed.

    This behaviour also appears in the docking station.

    Does anyone have an idea why this happens?

  6. #6

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    Looks like a nice project.

    I just wonder. It says, that computer works on battery fine, but problem is when you run it from PSU.
    So if I would mickey mouse the cables from psu to pins for battery, the computer would work?
    Can sombody confirm, and tell me how to connect it?

  7. #7

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    Quote Originally Posted by Niezgodka View Post
    So if I would mickey mouse the cables from psu to pins for battery, the computer would work?
    Can sombody confirm, and tell me how to connect it?
    The PSU uses a higher voltage than the battery, so using the PSU on the battery connector will destroy the machine. Using a correct voltage PSU should work, but I never tried it on a Toshiba (I did on other devices and it works almost everywhere). Fixing the PSU is the better approach, though.

  8. #8

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    I am glad to see this discussion...I have a literal stack of Toshiba T4xxx models from a previous employer. Last I checked, none of them would work, don't remember the code, but it probably is that P30...and I now I know the fix! At one point I was going to pull the hard drives and dispose of them, but getting to the drives isn't easy and I never got around to it. Perhaps that is a good thing! I'll have to see about trying to fix one some day and see if that does it...

    Wesley

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