Database Users

Anyone take the speaker out of an LG WCP-700 yet?

This is a picture of a circuit board from an LG WCP-700 Qi charger. It makes a very annoying beep, but I can't figure out what is making it. My best guess so far is the part labeled 331. Any help would be appreciated.

BadBoyNDSU said:
This is a picture of a circuit board from an LG WCP-700 Qi charger. It makes a very annoying beep, but I can't figure out what is making it. My best guess so far is the part labeled 331. Any help would be appreciated.
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Is the beep that loud? If you find out, be sure to post it here. Mine is on it's way.

That looks like it. I'll certainly take mine out when it arrives in a few days, if you are too afraid to yank it wait and I'll let you know how it turns out.
I'd rather have a dead charger than a loud annoying one
Sent from my Nexus 7 using Tapatalk 2

Might want to check this out. Someone stated that they took it out and it's dead.

I have the same question, I got the case open expecting this to be easy but I'm not 100% sure what to pull off the PCB. I think you are right that it has to be the part labeled 331. There is just not anything else that it could be.
That said I'm not willing to pull it without some confirmation. Maybe somebody here with more EE experience can tell us for sure.
I don't get my nexus 4 until tomorrow, maybe once I have it I can get the charger to beep and listen for where the sound is coming from.

Apologies for being slightly OT (although I'll be looking to do this when I get mine).
I'm struggling to find a supported voltage range in any specifications for this pad - I'm UK based and need either an adaptor or convertor depending on the range.
Could someone who has one let me know what the specs are please?

How did you get it open??? I've been trying for a week now and have all but ruined the bottom ha! A "How To" would be appreciated!

Jester23 said:
How did you get it open??? I've been trying for a week now and have all but ruined the bottom ha! A "How To" would be appreciated!
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The 4 little rubber feet on the bottom pull out and there are 4 small Phillips screws underneath.
I had to use a small screw driver to pry up on the feet, it felt like they might rip but they all came out undamaged. Once those screws are out the top and bottom are still held together by a couple of snap-tabs in the middle of the long sides. I was able to get them apart with a little prying and again nothing broke even though it felt like it might. The PCB is held on by 4 obvious Phillips screws.
Sorry I don't have any pictures and can't take any until after I get home from work later.

CodeMonkey said:
Apologies for being slightly OT (although I'll be looking to do this when I get mine).
I'm struggling to find a supported voltage range in any specifications for this pad - I'm UK based and need either an adaptor or convertor depending on the range.
Could someone who has one let me know what the specs are please?
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Here.

brettray said:
The 4 little rubber feet on the bottom pull out and there are 4 small Phillips screws underneath.
I had to use a small screw driver to pry up on the feet, it felt like they might rip but they all came out undamaged. Once those screws are out the top and bottom are still held together by a couple of snap-tabs in the middle of the long sides. I was able to get them apart with a little prying and again nothing broke even though it felt like it might. The PCB is held on by 4 obvious Phillips screws.
Sorry I don't have any pictures and can't take any until after I get home from work later.
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OK, mine is different then... I got it from Amazon and its a Verizon one and the bottom is all one solid rubery unit. I saw the 4 posts with screws when I pry it open but couldn't get to the screws.
Thanks!

Instead of pulling it or jacking up the PCB trying to disconnect, could you maybe just drown the thing in some sort of epoxy? if not muting it, may at least muffle it some

Check the ZENS Qi wireless chargers, no beep and work great!

Jean2000 said:
Check the ZENS Qi wireless chargers, no beep and work great!
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I saw them and would love to but not available in Canada or the US it looks like...

Jester23 said:
I saw them and would love to but not available in Canada or the US it looks like...
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They are now...!
check the store on wpcentral website

Jean2000 said:
They are now...!
check the store on wpcentral website
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Looks like OOS currently.

Neo42 said:
Instead of pulling it or jacking up the PCB trying to disconnect, could you maybe just drown the thing in some sort of epoxy? if not muting it, may at least muffle it some
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I've tried putting my finger over different parts of the PCB and the letting it beep, including "331", and nothing I do lessens the volume. That's why I'm baffled on what part is the actual speaker.

The part labled 331 looks like an choke/inductor to me. I wouldn't remove it...
edit: do you have a picture of the other side of the PCB?

Luxferro said:
The part labled 331 looks like an choke/inductor to me. I wouldn't remove it...
edit: do you have a picture of the other side of the PCB?
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The only things on the back side of the PCB are the two LEDs at the top. I am beginning to think that the sound is coming from the coil itself, like it is performing double duty as a charging coil and as a speaker coil.
BTW, I got my phone today and can confirm (as has been said elsewhere) that this charger works perfectly for charging the nexus 4. Well... expect for the loud beeps.

Jester23 said:
OK, mine is different then... I got it from Amazon and its a Verizon one and the bottom is all one solid rubery unit. I saw the 4 posts with screws when I pry it open but couldn't get to the screws.
Thanks!
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Just for reference here are some pictures of my charger, so that you can see the screw locations. Mine is also Verizon branded and came from amazon.

brettray said:
Just for reference here are some pictures of my charger, so that you can see the screw locations. Mine is also Verizon branded and came from amazon.
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Awesome, turns out the plugs were there the two I had tried to pry out tore making me think they did not come out. So, now just to figure out where the beep is coming from!

[Q] How to open the Nexus 10?

I want to open my N10 up, but I really don't know how much force to be using to separate the back from the screen (seems like it would require an extreme amount of force).
I have a suction cup attached to the screen, and I have the screw off the back. From there, I assume I would start at a corner and just press it downward to try to get the back off? Should it require a lot of force? Does the back bend, or should it?

Do a search, got to be videos on you tube.
Sent from my MB855 using xda premium

rbeavers said:
Do a search, got to be videos on you tube.
Sent from my MB855 using xda premium
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Only thing I can find is the PowerMedic teardown, which doesn't explain how much force should be needed still...
I'd rather hear from someone personally how hard it was to open their N10.

espionage724 said:
Only thing I can find is the PowerMedic teardown, which doesn't explain how much force should be needed still...
I'd rather hear from someone personally how hard it was to open their N10.
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Search youtube( google nexus 10 gets clean) shows the rear cover being removed. I couldn't post a link because I don't know how to! Hope it helps if

Lipp24 said:
Search youtube( google nexus 10 gets clean) shows the rear cover being removed. I couldn't post a link because I don't know how to! Hope it helps if
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Found it
Hmm, I'll have to see if I have a separating tool, but that doesn't look like too much force was used at all.

Finally got it open. Was a huge pain to do with a credit card (basically destroyed it mostly), but I started with the top-middle edge, and worked my way around from there. Biggest pain was to get the bottom edge off, but I managed to get that off after a while.
So, I just noticed that my Pogo connection area, there's a pin broken. From left-to-right, it's the 5th pin. Why is this?

espionage724 said:
Finally got it open. Was a huge pain to do with a credit card (basically destroyed it mostly), but I started with the top-middle edge, and worked my way around from there. Biggest pain was to get the bottom edge off, but I managed to get that off after a while.
So, I just noticed that my Pogo connection area, there's a pin broken. From left-to-right, it's the 5th pin. Why is this?
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Do you mean on the inside of the N10 there is a pin broken? I looked at those powerbook medic photos which its hard to get an angle on that area, but it didnt look like any of the inside pin connections were missing, so are you saying it looks intentionally not connected/separated?

bigmatty said:
Do you mean on the inside of the N10 there is a pin broken? I looked at those powerbook medic photos which its hard to get an angle on that area, but it didnt look like any of the inside pin connections were missing, so are you saying it looks intentionally not connected/separated?
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It's like a 3-piece system in the Pogo cable area. The N10 shell has the 5 pin area and has metal contact sheets on the inside for those pins. The N10 itself then has strips of metal I think above metal contact points. The strip of metal that should come in-contact on the N10 itself is cut-short on the 5th pin.
Probably not the best explanation though. I think I saw a post on the Pogo cable thread of someone mentioning this.

espionage724 said:
It's like a 3-piece system in the Pogo cable area. The N10 shell has the 5 pin area and has metal contact sheets on the inside for those pins. The N10 itself then has strips of metal I think above metal contact points. The strip of metal that should come in-contact on the N10 itself is cut-short on the 5th pin.
Probably not the best explanation though. I think I saw a post on the Pogo cable thread of someone mentioning this.
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I know there was a post about the pogo charger that included pictures, and in the picture one of the pins was either missing or shaded. the discussion assumed it was missing and gave theorys on why. (all perfectly reasonable as I remember.) BUT I just got a pogo in the mail a couple days ago and, at least this vesion, has all its pins. im guessing there is a couple ways the pogo "port" could be utilized, so a variety of combinations would certainly make sense.
but as for that cut short you're talking about, does it look machine done? like if its a ribbon-like material does the notch made in it look perfectly made such that it was done by machine? or does it look jagged or snagged? if it looks machine made Im sure its intentional. if it looked jagged or snagged Id be concerned that is on accident.
EDIT: i ask/say "ribbon like material" but same basic thought process for me re: metal extensoin posts - does the "cut" look like it was done with some sort of grinding device that would leave the pins as "not sharp" or does it look cut like when you flex metal a bunch and it snaps or if you use wire cutters how it leaves a jagged edge.
/my .02

user gone mad: USB got off

Hey guys!
Today i got my hands on curious thing. My friend was drunk "as he stated" and somehow he was able to tore off USB port from his beloved HD2. Crazy right, I didnt even believe it was possible as I am an owner of HD2 myself. So Im thinking about maybe try to solder it back together (if possible).
There are some pictures as attachements so you can take a look. The casing isnt damaged at all, its like that USB just fell of.

QQboss said:
Hey guys!
Today i got my hands on curious thing. My friend was drunk "as he stated" and somehow he was able to tore off USB port from his beloved HD2. Crazy right, I didnt even believe it was possible as I am an owner of HD2 myself. So Im thinking about maybe try to solder it back together (if possible).
There are some pictures as attachements so you can take a look. The casing isnt damaged at all, its like that USB just fell of.
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Connector seems burnt, just curious what you'll find inside... If the mainboard look like this that's bad news.
A new connector is cheap but there are different shapes of the inner part so it is possible that it won't fit, check before you begin to solder.

Looks badly burnt to me.
I suspect mainboard no good for repair but worth checking first.
Quite easy to pick up an EU version HD2 for around 40USD (faulty handset) on eBay if can spend a bit of time looking/bidding and in good shape except digitizer, then simply donor best parts to complete one working rebuild.

Hey thanks for replyin! Well I opened it up and it seems motherboard isnt damaged. Well, as far as I can tell . Phone is working with charged battery without problems, so I think its worth a shot. Take a look and tell me what do you think

QQboss said:
Hey thanks for replyin! Well I opened it up and it seems motherboard isnt damaged. Well, as far as I can tell . Phone is working with charged battery without problems, so I think its worth a shot. Take a look and tell me what do you think
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I had a hd2 in a similar condition and attempted this. I failed and it killed the mboard straight away i would only attempt if you really really need too ;/
Sent from my Nexus 7 using Tapatalk HD

hey buddy, thanks I will be really carefull. I cant really tell you what good is a phone like this without USB connection (and dont forget charging), so this is "operation: must do". Sorry for your HD2 though.

You can pick up a new usb socket from eBay/amazon etc.
It is quite a tricky bit of small soldering & can be very hard if contact points on board are broken below board.
Worth a try but not easy ... If you do succeed, once tested working ok use PU40 adhesive sealant to pack around sides & back of socket as will insulate & help secure socket hopefully helping reduce chance of fracturing joins or dislocating completely again.

Yup! USB is already on the way. Thanks for tips buddy, I will check back here when its done , it should take few days untill new USB is here.

QQboss said:
Yup! USB is already on the way. Thanks for tips buddy, I will check back here when its done , it should take few days untill new USB is here.
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Any news? Did you succeed with the soldering?

straylight975 said:
Any news? Did you succeed with the soldering?
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I'm also interested Any news?
Sent from my Nexus 4 using Tapatalk 4 Beta

I wish you all the luck, 'cause you gonna need it! (but maybe you're a soldering master and you know what you're doing...)

[Q] Nexus 7 Won't turn on!

Hello, today I dropped my nexus seven from very low and when I picked it up it wouldn't turn on so what I did is went and charged it and the backlight turned on but no charging image or anything whatsoever was appearing so then I tried holding the power button and it just made it go all crackily like a TV the Nexus has no cracks on the screen but just won't turn on, please help if you know how I could fix this please let me know

Try taking off the back cover, more then likely its your battery cable is loose. Happened to me once before
Sent from my Nexus 7 using xda app-developers app

Thanks mate that fixed it all I had to do was pry open back and then push down the connector and then babam it was fixed

Turns out it didn't work
So I opened back and pushed it in (It was already in very tight) and then I put case back on and nothing if I go to charge it it just puts on the backlight or flashes :/

Never had it persist like that. Try taking the ribbon off the connector a few minuets, while doing so check the male and female connections and see if nothing is bent/broken, if all looks fine plug it back in.
Off all fails, it might be the display ribbon loose, but I can't really tell you where it is or even if its a good idea to try to mess with it. Look up some videos on YouTube and see if the job would be easy for you. If not, you might have to send it out to get fixed. Idk what they do with rooted ones, maybe someone can shed some light on that topic.
Sent from my Nexus 7 using xda app-developers app

creep138 said:
Never had it persist like that. Try taking the ribbon off the connector a few minuets, while doing so check the male and female connections and see if nothing is bent/broken, if all looks fine plug it back in.
Off all fails, it might be the display ribbon loose, but I can't really tell you where it is or even if its a good idea to try to mess with it. Look up some videos on YouTube and see if the job would be easy for you. If not, you might have to send it out to get fixed. Idk what they do with rooted ones, maybe someone can shed some light on that topic.
Sent from my Nexus 7 using xda app-developers app
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Just so others with this problem can be aware from the start that this is a known issue, with a known fix, we have a sticky in this forum right here, or just look at the listings on the top of the forum. Hope this helps.

Thanks for the help guys but the problem is still here I will probably be sending back to Google this week, how long do you think it will take + I have warranty will I have to pay?

billykxda said:
Just so others with this problem can be aware from the start that this is a known issue, with a known fix, we have a sticky in this forum right here, or just look at the listings on the top of the forum. Hope this helps.
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Haha, ill keep the link copied at all times or direct a Google search next time.
Polo2673 said:
Thanks for the help guys but the problem is still here I will probably be sending back to Google this week, how long do you think it will take + I have warranty will I have to pay?
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Can take 2-3 weeks.
Sent from my Nexus 7 using xda app-developers app

Charging Port Issues

Um so about a month ago i was charging my Note and I placed it on my desks keyboard slide-out tray but the Note fell and landed directly on the charging port with the cable plugged in and it looked like it bent the port internally since the cable no longer sits flat or stiff. I am willing to open the device and fix it since my warranty is shot since I rooted it lol. What do you guys suggest?

Can you provide a picture? hard to say without knowing what exactly you mean.

cars10k said:
Can you provide a picture? hard to say without knowing what exactly you mean.
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Alright lol this is when i mess with it to get it charging:
Now when it goes stright in like it should:
Side view:

perez6991 said:
Alright lol this is when i mess with it to get it charging:
Now when it goes stright in like it should:
Side view:
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well, I think your options are probably pretty limited. Personally i would probably give it a shot, but you could also send it in to evga and pay for them to fix, probably $100+ or bring it to a local place to try it?
Brew