[wileycbii]

Opened er up. The female jack for charging has broken off the board. Anybody else have this problem? Fix looks easy enough. Debraid and resolder. Think this one was not assembled right and is missing on of the back pins necessary for positioning. Just curious as to user error or manufacturer defect.

[creative dude]

saw a lot of amazon buyers complained about the same. It is pathetic that they not ensure the quality of vital components like the charging port. after fixing the soldering, superglue could be applied. Once i receive the unit, I ll check if that solves the issue.

[daddyo]

This is a bit long but you may find it worthwhile to read.

I also am having a charging problem with a Momo7. The cause of the problem I believe is the HNC050200C wall adapter that was sent with the tablet. This adapter is rated at 5V/2A and has a micro USB plug on the end of the cable.

When this adapter is plugged into the tablet's micro USB jack the tablet turns on, gives a warning that the tablet charge is down to 1%, and then shuts off the tablet. It continues to do this over and over again until the adapter is unplugged. (Which I did after about 10 seconds because I didn't want to take the chance of damaging the tablet) Before the adapter was plugged into the tablet it reported the battery was at 78%.

Being an EE I made some voltage and resistance measurements on the adapter. While plugged into AC, the output of the adapter is 5.2VDC measured between the 2 outer pins (gnd) & (+5V)) of the micro USB plug. I also measured 5VDC on the pin next to the gnd pin . According to the OTG (On The Go) USB specification there is never a situation where the pin next to the gnd pin should have +5VDC wired to it. I believe this is the reason why the tablet went a bit nutty when this adapter was plugged into it.

According to the Battery Charging Spec V1.2 for OTG USB devices there are 5 scenarios for how the ID pin (the one next to the gnd pin) is to be wired depending on the usage of the OTG device.
You can find this in the 71 page specification on www usb org and the valid configurations are shown in the table on page 56 Table 5-3. The listing for "ACA ID Pull Down" show the 5 variations for the ID pin. The document is a bit deep but the bottom line is that there actually should have been about a 124k ohm resistor between the gnd and ID pins of the adapter if the tablet OTG USB was set up per this spec. If this was done correctly the tablet would have recognized the adapter as a charger and would have turned on an internal switch (likely a transistor) to allow the tablet to charge from the adapter.

I am hoping that the short time that I allowed the miswired adapter to be plugged into the tablet didn't damage it for charging from the micro USB jack.
I have notified the seller "HD Design" on Amazon of the issue and they are sending a new adapter. I will of course be measuring this before I plug it in to make sure that it is wired correctly.

Further research has led me to believe that I can use a Nokia phone charger with a 2mm x 0.8mm plug to connect directly to the DC Jack in case the USB jack will not work as a charger input. I have ordered one from Amazon.

As a side note I have the Momo7 Talent even though I ordered the Momo7 IPS. They sent the wrong one but it is too much hassle to send it back.

I will post an update when I get the adapters.

Update: 1-26-2013
The 2mm plug on the Nokia is too small. It would be nice if there was something from Ployer that specifically said what the proper power plug size was so that I wouldn't need to play around trying to find one that fits. I got a pair of calipers and the hole in the tablet where the plug is inserted is 2.5mm.
While updating this post I did a search on ########### for Momo Charger and got a hit on a charger that is supposed to be for the MOMO15 MOMO11 MOMO9 MOMO8 MOMO7 Daul Core Star Bird Speed. Looks like I should have checked ########### first. I'll be ordering that one now. They have it as a buy it now for $6.99.

Update 2-3-13
I still haven't received the replacement Adapter that has the micro usb on the end of the cable. It is probably on a slow boat from somewhere. ;-)

After reading through many of the posts on SD about the charging problems with the Momo7 devices I thought that I should elaborate a bit on what I found with the adapter connections and how it might impact your tablet.
As I stated in the earlier portion of this post "the adapter is 5.2VDC measured between the 2 outer pins (gnd)&(+5V))of the micro USB plug. I also measured 5VDC on the pin next to the gnd pin". Without opening up the tablet I do not know how the circuit would react to the +5V being on the ID pin. Some have posted that when they pull out the micro usb plug that the jack comes out with it. Based on that statement there is the possibility that the +5V from the adapter is being shorted in or near that usb jack causing it to get hot enough to melt the solder that holds the plug down to the pc board. If that is happening it would get very hot near that point in the case and I would expect that the plastic opening around the usb jack would melt or discolor.
Without opening the tablet up this is just speculation on my part.

If you are having the issue where the tablet seems to not charge or lose charge when the adapter is plugged in you need to find a way to measure for the incorrectly wired micro usb plug. If you have a meter that can measure resistance you should check that neither of the outer 2 pins are shorted to the contact next to them. If it is wired by the OTG specification what you should find is that one of the outer pins will have a high resistance of about 124k ohms to the contact next to it. If you do if you do find that 2 pins side by side measure less than 10 ohms you should try and get a replacement adapter.

If anyone has already received a new adapter and can measure it as I describe above, could you please post your results so that we will know for sure if a properly working adapter is wired to the OTG spec?

Since I have a Momo Talent I have been able to charge it using an external variable power supply through a cable I made to plug into the power jack that the Talent has, which I believe the Momo7 IPS doesn't have. It takes about 3.5 hours to charge from 20% to 100% with the power supply set to 5.2V. This is about the amount of time you should see for a charge if you have a "good" 5.2V/2A adapter. The current appears to be regulated by the tablet and stays at around 1.2A for most of the charge.

This post has been edited by daddyo: 02 February 2013 - 08:36 AM

[creative dude]

hello dude, I got the same charger hnc050200c. And it is okay to charge from it but very slow and battery drains fast if we charge less hours. seeing your analysis I guess we need a new one as it is cheap China thing(not manufactured by ployer I believe). do you think OTG is related to chargers ? the charger cable is different from a OTG cable.

[daddyo]

creative dude, on 02 February 2013 - 03:38 PM, said:

hello dude, I got the same charger hnc050200c. And it is okay to charge from it but very slow and battery drains fast if we charge less hours. seeing your analysis I guess we need a new one as it is cheap China thing(not manufactured by ployer I believe). do you think OTG is related to chargers ? the charger cable is different from a OTG cable.

I fFinally received the replacement wall adapter. What they sent has a European style plug and then they threw in the USA adapter plug to make it usable. This makes the stack up of this thing about 3 inches high. The mating of the adapter plug to the wall adapter is also very loose and could never be plugged into a vertical wall outlet without falling out. Another thing about this wall adapter is that it does not have the micro usb plug that the first adapter they gave me had. This one has the 2.5mm plug for the power jack. I was able to plug it in and it did charge the tablet up to 100%. I figured this was the best I could do so I removed the original screen protector since I figured I wouldn't be sending it back and I found that the screen is covered in very fine scratches. I have already requested a refund through the seller and amazon. :-(

Unfortunately I still have no way of knowing how the correct type of micro usb plug should have been wired to charge in the tablet.

As for OTG being related to chargers, basead on the OTG spec a charger (wall adapter) would need to be made so that it would charge the tablet through the micro usb port but at the same time that micro usb port has to be designed so that when a standard usb to micro usb cable is plugged in that it can't charge the tablet. The reason for this is because the tablet will draw about 1A during charge and that is too high for a standard usb port on a computer to be able to deliver. This could damage the computer and that would not be good for the tablet manufacturer.

For anyone else who reads this I purchased the tablet from HD Design through amazon marketplace because I didn't trust any of the regular online sites like pandawill or lightake. Looks like it didn't matter since the box that the tablet came in had pandawill on the label.

[laughingdata]

This happened to me,
when trying to resolder it I managed to break some of the back pins on the connector,
Ordered another one and now it works fine except for an intermittent connection issue, i think this may be caused by remounting the port very slightly back so may need to file part of the case down

[npb]

I bought 3 momo7 tablets from Didobuy at Christmas and at first thought they were fine. However in January 1 developed a fault with the USB port with the internal connector completly falling out. After a bit of chasing, Didobuy eventually answered the phone and agreed to exchange the unit - althought they insisted that I had to pay for the carriage and even though their own website says they will pay for warranty claim carriage charges!

Now only a month later another tablet has developed the same fault with a USB port fault and the unit will not charge. I have so far failed to get any answer to phone or e-mail It would be useful if anyone could tell me if this company has dissappeared and do I now need to contact trading standards to sort this out. These units abviously have a manufacturing fault and so I really now want a full refund.

[fran72]

I have just had a tablet repaired with DIDOBUY I purchased in November 2012. They have changed their address and seem to have done away with their contact number. I had a charging problem with it and they replaced the charging hub but refuse to refund my £9.75 postage. Their email communication is appalling and no matter how many times I tell them they are entitled to refund my postage they refuse. This company won't last long!

[w_n_s]

The charger I received with my momo 7 is very slow. I used a blackberry charger in work and it was much faster. Weirdly the momo charger will not even register on a blackberry when plugged in. It doesn't even pick up that a charger is there. I think it is just a very poor cheap charger.

The usb port is very very tight. I can understand why loads of people are having issues with it falling off. I think any resellers / importers would be well advised to open every unit and re-inforce the interface connectors with glue / solder.

This post has been edited by w_n_s: 12 March 2013 - 04:32 AM

[creative dude]

w_n_s, on 12 March 2013 - 04:29 AM, said:

The charger I received with my momo 7 is very slow. I used a blackberry charger in work and it was much faster. Weirdly the momo charger will not even register on a blackberry when plugged in. It doesn't even pick up that a charger is there. I think it is just a very poor cheap charger.

The usb port is very very tight. I can understand why loads of people are having issues with it falling off. I think any resellers / importers would be well advised to open every unit and re-inforce the interface connectors with glue / solder.

Great. could I know which blackberry charger works good. Is it 2A charger?

[w_n_s]

creative dude, on 12 March 2013 - 06:28 AM, said:

Great. could I know which blackberry charger works good. Is it 2A charger?

I take that back. It has given me problems. Yesterday I could only get the tablet charged to 70% using said charger. I let the tablet drain this morning, but couldn't get it to charge the tablet enough while on to even get the thing to boot / connect to wireless. I have turned it off and am using the same charger to try to charge it. Will see what happens.

I'm guessing, this tablet needs a really specific charger type to charge well while on and off. It probably also has battery calibration issues within the firmware that need addressed. I'll see what I can do with

Any help would be much appreciated.

This post has been edited by w_n_s: 14 March 2013 - 08:08 AM

[w_n_s]

Ok, so I completely drained the battery yesterday until it wouldn't even power on and took my tablet home.

I kept it turned off and plugged in the wall charger that it came with (5V 2000mA) charger. Periodically, every hour, I switched in on, checked that the level was going up, which it was. Probably took around 5 - 6 hours to fully charge. Once it hit 100% I ran a battery calibration tool on it to delete any previous battery stats.

I've just taken it off the charger.

I am using it now streaming music over wireless with the display always on and at full brightness.

So far stats are reporting 5 mins on battery has used 6% of the battery.

At that level of use, thats me only getting 1.5 hours typical use out of the tablet.

I will run it down as it is at the minute and see how long I truly get out of it.

One thing is for certain, it needs a 5V 2000mA charger. Anything less than 1000mA (which seems to be most chargers I have lying about) can barely keep up with whatever power the tablet is drawing through normal use.

EDIT

2 Hours 50 Mins of constant internet audio streaming with screen on at full brightness - still 50% battery remaining..........

Will update when fully drained.

This post has been edited by w_n_s: 15 March 2013 - 08:49 AM

[w_n_s]

wow!

5 Hours 53 Minutes it took. Continuous audio streaming + always on screen @ full brightness.

Not bad at all.

[creative dude]

Yeah, charging time almost equal to discharge time. seems no way to make the charge faster than 5hrs

[w_n_s]

Still having issues charging this thing.

The charge level simply refuses to rise. I end up having to keep disconnecting it throughout the day, or checking on it, to get it to "kick in" so to speak. It could be at 10% and if I go away for 5 - 6 hours, and come back and check it, it could still say 10%. The only way I have properly found to charge it is to power it off completely and leave it to charge with a 2000mA adaptor. I still have to return to it a few times to wake it up / disconnect the cable to kick it back into charging again.

The 3b TNT firmware is no good to me as it suffers the 1 touch issue. The 3c version might be better but I cannot find it anywhere .

I am currently loading up this one as I heard reports that it resolves charging issues on another forum :

http://www.rockchipf...01-20121225.zip

See if I fair any better with the charging issue.

Will report back.

EDIT

Dammit - that Stock firmware suffers from the 1 touch issue as well . So far, I have a firmware that has no 1 touch issue but it is not a TNT firmware.

I'll run it a bit to see if the charging issue is at least resolved .

This post has been edited by w_n_s: 19 March 2013 - 04:56 AM

[w_n_s]

The 25th December stock firmware doesn't resolve the charging issue and it suffers the 1 touch issue. I am still on the firmware produced by the tablet reseller in October / November 2012. This doesn't suffer the 1 touch issue.

On the charging side, I have been seeing more positive results having the tablet turned off and charging with a 2000mA charger. Most times now, it is fully charging the tablet overnight without any interaction. As it holds 6 hours, this is more than enough to do me over the course of a day until it needs charged again, so it will have to do.

[dneill]

Can only charge with upward pressure on usb plug. Must have a connection problem inside. Seems common. Can anybody tell me how to open the case. Obvious join but where is best place to force it open and how?

[Dougn Redhammer]

First time poster, also first time buyer of a ployer product, previous tablets i have purchased and own are kindle fire and cube u30gt. Anyhow i got this tablet three days ago in the mail played with the default firmware on the first day, on the second day flashed it with top notch's 3c firmware , on the third day not 30 mins ago the usb charging port just fell out of tablet when i removed the data plug that came with the tablet.

Is ther anyway for me to fix this myself? i shudder to think if i will get any support from the seller i purchased since its all the way in china.

[w_n_s]

Dougn Redhammer, on 14 April 2013 - 09:06 AM, said:

First time poster, also first time buyer of a ployer product, previous tablets i have purchased and own are kindle fire and cube u30gt. Anyhow i got this tablet three days ago in the mail played with the default firmware on the first day, on the second day flashed it with top notch's 3c firmware , on the third day not 30 mins ago the usb charging port just fell out of tablet when i removed the data plug that came with the tablet.

Is ther anyway for me to fix this myself? i shudder to think if i will get any support from the seller i purchased since its all the way in china.

This is why I purchased my momo ployer from an amazon reseller instead. I had this happen for the power and audio ports in a previous china tablet but the amazon reseller repaired it and shipped it back to me under warranty.

The momo ployer is a really decent little tablet, but i'd much rather pay a little bit extra to receive more local support and warranty.

Also, they are known for the USB ports falling out. I *think* my reseller has taken to opening all of theirs and re-inforcing the connection prior to selling so that it doesn't happen. I think the issue is that on a new tablet, the port was very very very tight and the connector had a very weak solder / bond to the board and initial plugging and pulling of the USB cable caused it to simply break off.

This post has been edited by w_n_s: 19 April 2013 - 01:48 AM

[jeetlebuice]

ive recently had the same problem with the charging jack(on momo7)i.e it came out attached to the charger.just today ive come up with a fix that wont last forever,but it will last longer than a replacement from ployer.

i opened up the tablet,unscrewed the board and taped the jack back into place,also i placed a small piece of plastic ontop of the jack before putting everything back together.now everything is screwed in to place and the cover is back on,the jack seems more sturdy than when i first purchased the tablet.

honestly though,the things u have to do in order to get a working tablet(but atleast now i am happy,as i have more faith in myself than i do ployer)