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Very Strange Problem with Laptop Keyboard/Power Button

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Hey everyone, I am working on a friend's Dell Lattitude E5530 and the original complaint was that the power button didn't work.

What I have found is that it wont turn on unless the keyboard is removed from it. Originally I thought it was the power button so I replaced that and when that didn't help, I replaced the keyboard but it is still wouldn't turn on. It even works if the keyboard's ribbon cable is connected and I hold the keyboard up off the computer's frame but when i pop it into place and screw it in, it wont turn on until I remove the keyboard again. If I hold the keyboard off the frame and turn it on the keyboard and everything works perfectly fine and if I install the keyboard with the computer on already, it still works fine but then if I shut it down and try to turn it back on, no dice.

I am assuming it is a short of some kind so my next idea was to put some sort of non-conductive material under the keyboard to hopefully stop the short but I have no idea what to do. Very frustrated here and have already put $70 in parts and lots of time into it so just wondering if you guys had ever heard of such a thing. Thanks in advance for your help.

P.S. - I can't find anything like this problem on google
 

eidairaman1

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Clear tape in certain spots
 

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Sounds odd...I would double check clearances. My Dell 3540's keyboard pops out from the top, no screws...has perimeter spring/clips...is that how the E5530's keyboard is?

I would say double check the ribbon routing to the power switch, which you probably have already done. Next thing I would question is a longer screw where a shorter one should go and with the keyboard seated, the screw causes a short on a circuit that is only used for power-on...that or I'd be concerned something else isn't routed quite right and maybe when you install the keyboard there is a pinch or a pull that causes a seated connection somewhere to dislodge just enough to be useless.

I'd do a tear down back to the power button and look close. Sorry you've reached this issue...laptops can be a pain in the ass with odd issues like this for sure...I bet you'll find the problem soon enough though. You just gotta find what was routed or seated incorrectly. That is usually the case when dealing with issues like this, sometimes all it takes is one wire going the wrong way to make a mess of things quickly.

Clear tape as suggested can be helpful too...keep us posted!
 

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my favorite gapper of all time is a penny or 2 wrapped in electrical tape.
 
Joined
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Thanks for the replies, my next step is to try non conductive tape in certain spots before doing an entire teardown.

Actually, this keyboard is held in by one screw on the bottom of the laptop (picture 1) and 5 screws under the bezel around the keyboard (picture 2+3) but does snap into place and kindof stay there without the screws

Picture 1
upload_2014-12-14_15-33-35.png
Picture 2 ----------------------------- Picture 3
upload_2014-12-14_15-33-51.png upload_2014-12-14_15-33-17.png
 
Joined
Oct 26, 2008
Messages
2,119 (0.37/day)
Location
massachusetts
System Name VAN
Processor Intel Core 2 Quad Q9650 3.0GHz LGA 775 95W @ 3.0GHz
Motherboard ASUS P5Q Deluxe LGA 775 Intel P45 Intel Motherboard
Cooling Thermaltake SpinQ VT, front-rear-side 120mm, top-bottom 80mm
Memory Crucial Ballistix Tracer 8GB(4x2GB), DDR2, 800 MHz, 4-4-4-12, 2.0V, w/ Red LEDs
Video Card(s) AMD Radeon HD 6770 1GB
Storage Samsung 850 PRO 256SSD (OS) - WD 640GB 7200 RPM (files) - Seagate 1TB 7200 (backup)
Display(s) DUAL 19" Samsung, LG LCDs
Case NZXT Lexa Blackline
Audio Device(s) Realtek Onboard
Power Supply OCZ 600 Stealth-X-Stream 600W RT
Mouse Cyborg R.A.T. 9
Keyboard Razer Black Widow Ultimate
Software Windows 7 Ultimate
Once I get a chance to work on it again I will share my findings!

Been a while Sol, nice to see you're still around :)
 
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