[Q] Lapdock charging issue - Atrix 4G General

The strangest thing is happening when I am using my lapdock while it is charging. If I run my fingers or palms lightly across the palm rest, I feel what I might describe as a vibrating sensation or what you might feel from a constant very, very mild electrical current. I assume there's a really good explanation for this,but has anyone else experienced this? It makes the lapdock almost unusable for me while it is charging. I only noticed this recently and I'm kind of just hoping my unit is just broken.

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[Q] Odd "Vibration" When Charging

Something odd I noticed a week or so ago. When my tab is charging, if I run my finger lightly along any part of the metal case, there's a REALLY faint "vibration" or "tingle", reminiscent of the feeling you get when you put one of those 9V square batteries on your tongue.
If I disconnect the charger then it stops, so I figured there must be some kind of short in the tablet somewhere.
But I finally found my multimeter this morning and tested it. There is absolutely no current in the casing at all. 0.000 volts. 0.0000 amps. Nada. Zip.
So what the hell IS it? I don't think it's the internal vibrator as I can't hear anything. Is anyone else getting this? It's strongest around the middle of the device, around where the Acer logo is on the back, but can only be felt on the metal parts, not the glass...
It might be an electro magnetic induction current, and the plastic is insulating the metal from earth - you are then providing the earth to make the circuit.
Where did you measure from and to with the multimeter? Try case to earth on another power socket, or case to earth with your tongue (wet, very conductive) (wet fingers if you's scared.. LOL).
I tried all the ways I can think of, including those, but there's nothing I can pick up with my meter. Alas, my scope is broke.
My wife can't feel it at all, but my kids can so I'm positive I'm not imagining it. It's not there when unplugged from the charger, there when plugged in.
BTW, generally, water is a very poor conductor of electricity, especially through the tongue as saliva has a pH of 7.5, which will insulate rather than conduct. You need water with a pH of <5 or >9 for decent conductivity.
Don't worry, I can feel the same vibration with my HTC Desire (which has a metal case, too), funny enough not with my A500, though. Not everyone can feel it, which either means not every device has that effect or not everybody can feel it.
True, but it's still better than dry skin, especially finger print tipped fingers.
Fluffbutt said:
True, but it's still better than dry skin, especially finger print tipped fingers.
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Click to collapse
Nope. With wet fingers (saliva or tap water) I can't feel the vibration at all, with dry I can. This tells me it MUST be electrical, but I'm damned if I can get it to register on my meter.
BTW, though I've not done much in the last 20 years, I originally trained as a microelectronics engineer, so I do know what I'm doing. I've never seen this in a device that DIDN'T register some kind of current flowing through it...
I've always been pretty sensitive to tiny electrical currents, so it probably IS some kind of short that my fingers are picking up, but can't get through the anodised coating on the metal back for my meter to read it. I AM getting a tiny reading of 0.003722 volts on the bare metal in the dock port, but my fingers sure shouldn't be able to pick THAT up!
Still, with no readable value on a meter, there's no way I'll be able to return it as the store just won't believe me, so I guess I'll live with it and just check it periodically.
I have exact the same thing, when the A500 is charging and I'm touching the case, it is vibrating a little.
I got my A500 since friday. I registered same vibration during the first charging. I don´t know what to do with it....
E.
Yeah I noticed this too. The list of quirks with this tablet just seems to grow by the day
i have the same issue before, i changed the power adapter from Acer and the problem solve. Their report log show 'electrical leaking'
I truly don't doubt what you say.
I honestly would've though that wet skin would be better than dry or skin-oil skin. Weird.
See if you can get a infinite resistance reading between the metal shell part and the dock port (like you should). I also suggest a separate test of the charger unit for leakages.
Maybe also test the charger port and the dock port for max resistance, charger port and skin as well.
OK, it's probably not dangerous (well, maybe not now..), but it IS bloody interesting!!
FloatingFatMan said:
Nope. With wet fingers (saliva or tap water) I can't feel the vibration at all, with dry I can. This tells me it MUST be electrical, but I'm damned if I can get it to register on my meter.
BTW, though I've not done much in the last 20 years, I originally trained as a microelectronics engineer, so I do know what I'm doing. I've never seen this in a device that DIDN'T register some kind of current flowing through it...
I've always been pretty sensitive to tiny electrical currents, so it probably IS some kind of short that my fingers are picking up, but can't get through the anodised coating on the metal back for my meter to read it. I AM getting a tiny reading of 0.003722 volts on the bare metal in the dock port, but my fingers sure shouldn't be able to pick THAT up!
Still, with no readable value on a meter, there's no way I'll be able to return it as the store just won't believe me, so I guess I'll live with it and just check it periodically.
Click to expand...
Click to collapse
Fluffbutt said:
OK, it's probably not dangerous (well, maybe not now..), but it IS bloody interesting!!
Click to expand...
Click to collapse
I really doubt it's dangerous, but it does indeed sound like there's leakage current on OPs tab. I've had similar experiences with e.g. some PC cases and there the problem was easily solved by making sure the case is well-grounded. Also had a washing machine that did the same, but as there's water involved I had to check it out properly and it was indeed a defect unit and had to be thrown out.
I get the same, both on the case, and when i run my finger over the glass, makes it tingle slightly, unplug the charger and wherever i touch its gone. perhaps from the screen getting the full V/amps from the charger?
I'm glad not to be the only one experiencing this so called "electrical leaking".
But it seems I am the only one who actually enjoys this feeling on my fingertip. Don't you?
pintness said:
I'm glad not to be the only one experiencing this so called "electrical leaking".
But it seems I am the only one who actually enjoys this feeling on my fingertip. Don't you?
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!!!!!!!
If you try another part of your anatomy on the screen, DON'T post the video!!
LOL!!
;->
I get the same vibration but on the bottom edge of my a500 .....strange.....
Sent from my XT720 using XDA App
lol
My advice would be to *not* lick / taste your a500 while it is charging
me too
The cases is hot with respecs to earth. The adapter needs replaced.
Mine dont do that.
Sent from my A500 using XDA Premium App
I noticed this too when I first got my A500. I don't notice it anymore because I always have it in the Folio Case.

TF101 -Anyone elses getting loose when docked?

when i first got my tablet and dock which originlly just a day apart (once i used it , i just knew i wanted the dock)........thy fit together really snug. And i remember wondering initially if the multi piece design of the hinge would eventually be a problem, and get loose.
Well after 3 months, of which i very rarely take the tablet out of the dock, usually only if i want to play a game with tilt controls and such, So i keep it in netbook form almost always.. but its finally starting to get loose enough to be worrysomewhen its open and the tablet is standing straight up, i can wiggle the device and id say theres really close to 1/2 to 3/4 of an inch, of play or wiggle out at the top of course.
I would say a few millimeters play at the connection itself. when you open or close it and watch it you can see it spreading.
I actually went upto my local best buy where they have one on display that im pretty sure is the same one thats been there since i boughy mine 3 mnths ago, and its obviusly gotten a good amount of action. But its about the same as mine maybe slightly looser.
I use the hell out my tablet anfd although i do feel asus should have and could have made that connection stronger, im not complaining about the build of the device at all, i know i use this thing everyday all day, i never have it more than a few feet away from me so if its gonna get loose at all ill do it.
Now im wondering how everyone else uses theres and how loose are your guys tablet to dock connectin is there a lot of play, and has anyone tried to fix it or do anything about it.
i put a thin piece of felt which wont scratch anything and is very flexible so i figured it had give but i slide that in between the back of the tab and the metal overlapping dock hinge, and it stiffened it up pretty good.
its only gonna make it spread open more.
Sounds normal to me, there is a piece of felt in the hinge already at least on my dock, and as long as the clip is locked and the connector is making a good connection it appears the stress points are the clips not the connection. I am certain that a product like this has many thousands of on off cycles on the dock hinge as well as open close cycles before releasing it, so far I've not heard a report of a broken hinge assembly, seems to be made of pretty sturdy material imo.
I wouldn't recommend putting more material into the hinge if you think it will exacerbate the issue..

Headphones cutting in and out

Well, unfortunately, my headphone jack has worn out. Even the slightest jiggle cuts out the left, right, or both channels. I popped off the rear cover of the phone, and the solder joints on the mainboard are intact, so I assume it's just that the contacts have worn down. They didn't seem to be very receptive to any bending further out. (On a side note, it was amazing how much dust and grime was in this supposedly sealed device, and I swear, my phone runs on an average 5° cooler)
Does anyone know a decent way to fix/replace this? I don't see a motherboard on ebay, and while I'm handy with a soldering iron, I have no idea of where to aqcuire a replacement jack. Bluetooth headphones are an option I understand, but that is less than ideal considering my Schfancy noise cancelling earbuds.
Any help, or a nudge in the right direction would be great.
Thanks,
Sidney
same problem here. One year old phone, only 4 mounth of everyday headphones use and when I touch the 3.5mm jack, my left channel cuts.
I dont know how to fix this, but I can see some corrosion on connections. Its not shinny at all.
Ditto. My phone just started doing this a couple of days ago as well. I too have only had the phone a year and the left side started cutting out quite a bit. I'm glad to hear it's just the phone though. I thought my headphones were going bad and that was going to piss me off even more because I rock some pretty spendy cans.
Sent from R2's G2
Op, you have ideas why this phone can get really hot? Especially in Australia the weather can be quite unexpected at time and can get really hot. I just don't like how my pocket heats up due to my phone. I haven't even owned this for a year and it gets quite hot
Sent from my HTC Desire Z using xda premium
knightslay2 said:
Op, you have ideas why this phone can get really hot? Especially in Australia the weather can be quite unexpected at time and can get really hot. I just don't like how my pocket heats up due to my phone. I haven't even owned this for a year and it gets quite hot
Sent from my HTC Desire Z using xda premium
Click to expand...
Click to collapse
Got gps running while in your pocket? Gps has always heated the crap out of my phone. Also make sure if you are overclocked that you don't have it on something to high.
If you see corrosion in the jack try to clean and see if works(op) if not sounds like you are gonna need to switch to blutooth
Sent from my HTC Vision using xda premium
If cleaning it out doesn't help, you could always crack it open and resolder the connector I've seen some of my engineering buddies successfully fixing their 3.5mm connectors on other devices.

[POOL] How is your Nexus 7? Flawless?

Please vote and let us know about your N7 and where did you buy it.
This pool could give us clue about the build quality and help people to make buying decision.
So, again, if you own or owned one, please vote.
Thanks.
Things I noticed about my Nexus 7 in the first night with it:
1) Right audio output is dead. 3 headphones pushed in all the way. This in the end is why I'm getting a replacement.
Other minor issues:
2) Touch seems flaky. A single touch-drag will glitch into two touches every now and then. I noticed this when browsing it will suddenly zoom instead of scroll. I also see it in Swype where it will drop in the middle of a long word, really annoying. There are other glitches that I can bring out with multi-touch in a test program but I don't think they are significant comapred to the ones I can actually notice causing problems while using it. All I know is that the touchscreen performance of my SGS is pretty much flawless (one of the reasons I bought it over the Desire) and the N7 unit I have now is far from it and it shows in some pretty annoying ways.
Is this systemic or a random defect? Hardware or software fix? Who knows, but from what I have heard and know these digitizers are discrete units that report touch locations and can't be fixed in software. Worth returning the device over? Maybe, but sadly I think it might mean bailing on the device completely as it could be unfixable.
3) Orientation sensor is off by about 4 and 6 degrees in X and Y directions. Sucks to play a game and have a tilt offset, and probably screws with auto-rotate a bit too. This seems like it could be calibrated out easily but this functionality, if it exists, is not readily apparent. Wonder if this is caused by UPS or whoever tossing the boxes around. My SGS was off about 4 degrees after a drop, but there was a command line calibration for it (also in the menu in 2.3, but I got lucky when they repaired the faulty internal SD it went away, probably on the same board as flash that was replaced).
4) Screen raised up on the left side. This is first thing I noticed because I looked for it first. I could probably live with it or try the washer fix if it weren't for the audio jack problem. It doesn't make any creaky noises or anything.
The screen as far as display looks quite good. Even blacks with no backlight bleed or dead pixels. My concern is that my replacement unit will have a worse problems with the display than this one, then I'll end up riding the replacement train for another pass like so many other folks. I might just ask a Google rep straight up if it would be better to wait a few months. I was prepared to do this for minor problems but the broken audio jack is pretty major.

Static or buzzing feeling on metal edges when charging

Hi, first post here.
Ever since purchase, my Samsung S8+ will have a slight static feel at the metal sides when I'm charging it (cable or wireless). I googled and found that there's no thread regarding this issue, so I'm wondering if my phone's the only one doing this? The feeling is like a slight vibration when my finger/palm touches the metal bezels/edges.
I really want to enjoy my phone without a case but the static feel bothers me every time I want to use my phone when it's charging, so I have no choice but to put it in a case.
If there's anyone with the same issue please let me know.
Cheers

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