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trying to repair android tablet

buiderbob

Apr 30, 2013
2
Joined
Apr 30, 2013
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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!
 

davenn

Moderator
Sep 5, 2009
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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
 

buiderbob

Apr 30, 2013
2
Joined
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better pics



DSC_0137.jpg

DSC_0138.jpg

DSC_0142.jpg

DSC_0144.jpg[/ATTACH]

here are some better quality pictures
 

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CocaCola

Apr 7, 2012
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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...
 

BlinkingLeds

Feb 23, 2013
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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
 

CocaCola

Apr 7, 2012
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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

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...
 

CocaCola

Apr 7, 2012
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...and also ensuring an extra sale whenever someone connects the power incorrectly.
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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