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trying to repair android tablet

Discussion in 'Troubleshooting and Repair' started by buiderbob, Apr 30, 2013.

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  1. buiderbob

    buiderbob

    2
    0
    Apr 30, 2013
    130430-211054.jpg

    130430-211048.jpg

    Here are pictures of the circuit I am trying to make work.
    Basically the tablet doesn't turn on when plugged in or on battery. When I got it, the red and black wires on the left were disconnected.
    One set of black and red wires are for the screen and the other for the battery.
    I have soldered the Black and red wires that were loose to some solder joint that I guess they came off because the solder had bits of wire sticking out.

    Any help would be greatly appreciated!
     
  2. davenn

    davenn Moderator

    13,561
    1,856
    Sep 5, 2009
    hi there
    welcome to the forums :)

    The pic's are just too blurry to make out anything much of the board and wiring
    Try and do some sharper and well lit pics

    Dave
     
  3. buiderbob

    buiderbob

    2
    0
    Apr 30, 2013
    better pics



    DSC_0137.jpg

    DSC_0138.jpg

    DSC_0142.jpg

    DSC_0144.jpg [/ATTACH]

    here are some better quality pictures
     
  4. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Generally red wires connect to red wires and black wires connect to black wires, seems like you have the wires crossed... But, a closer picture of the area is necessary to confirm, looks like J7 is one big solder short from your existing pictures...

    Battery wires lose in there and bouncing around could have caused other damage, so could reversing polarity...
     
  5. BlinkingLeds

    BlinkingLeds

    180
    0
    Feb 23, 2013
    I think i see a diode there to prevent that. The manufacturer must have thought of protect such an expensive device from that simple and common mistake
     
  6. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Well you might be surprised, these are considered sealed 'non-serviceable' by the end user devices thus there is no reason to protect against polarity and thus saving a penny by not installing a diode will save the company $10,000 per 1 million units manufactured... This holds true for MANY products nowadays...

    Also this does not negate what I see you potentionally did in crossing the wires, protected or not it's still not a good thing to hook things up improperly... Second diode or no diode it won't protect against the broken wire bouncing around when it came disconnected and shorting whatever it come in contact with...
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,363
    2,758
    Jan 21, 2010
    ...and also ensuring an extra sale whenever someone connects the power incorrectly.
     
  8. CocaCola

    CocaCola

    3,635
    5
    Apr 7, 2012
    Well you did likely void the warranty when you opened it and assumed full responsibility for what you did, and that is exactly what the manufacture will tell you...
     
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