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My tablet - common issue it may seem with power components
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drguild
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2012/11/19 - 08:14
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I couldn't find the topic I posted in but this is kinda new anyway.

I had my dad look a electronics engineer to look at my tablet where it flashed a white light and turned off one night and his response is that it appears that the IC labeled HB62988 has died and could be a common issue for these tablets.

 

>>The fault is in the Power section the IC HB62988 is extremely hot and pulling excess current delivering only 2V out to battery when charger connected.

 

Unfortunately this IC one cannot obtain, so we have started renewed pressure for them to allow us to send just the mainboard back as they did with another user who had a dead screen.

 

>>cube-tablet were very helpful and cooperative with warranty. i was unable to send it back for warranty because of stupid courier rules in my country. cute-tablet.com will send the replacement panel, soon i will post display panel replacement pics.

 

If they do not allow us to return the mainboard we will call them out for double standards.

First response he got was they thought he wanted to buy new lithium batteries for the tablet which I have corrected in a email to them.

I will keep this updated.

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drguild
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2012/11/30 - 16:19
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baadjiie.jpgImage Enlarger

cube-tablet.com has basically said they are not willing to help me anymore and I have to live with the laws in my country etc and refused to help me unless I sent the tablet in full with batteries which is illegal under EMS etc who they specify to use for warranty.

I tried soo hard to get them to help me even going as far as offering to pay myself for all shipping fees and trying to work out a solution with them which is legal as it illegal under my country and their service they do warranties by to send products with lithium batteries in them.

All they could offer me was to buy a brand new tablet as a warranty replacement and they knock there markup off, a measly $20 discount on a new product + shipping which doesn't even make up the full shipping cost.

In the end they are now ignoring my emails.

I have contacted the official Cube manufacture offering to work with them to get this sorted out and doubt I will get a reply.

So now I am totally out of my money unless the manufacturer helps me.

Here is my dads report on the tablet along with a image of the damaged part.

Admin if you cannot get your device to work and are ok with parting with it I mby might be able to use working parts from the mainboard to fix mine so don't just chuck it out ok.

 

>>Basically its a very simple fault.  The Voltage regulator (arrowed) Controls and distributes various voltages around the board.
The IC has failed with an internal breakdown of components and is placing an excessive load on the external wall wart.

>>Normally the plug pack supplies 12V this is pulled down to approximately 2V causing it to get extremely hot and if left connected would also fail and possibly erupt with a fire.

>>The IC takes its power source from both the Lithium Batteries (2) and the external Power Supply wall wart. Thus batteries are not charged as the charging circuit is also contained in this IC.

>>A Google search does not reveal any sources nor information on the IC.  It is a manufacturer's exclusive IC for this particular tablet. (This is common in today's electronics scene for patent and copyright purposes)

>>The section bounded by the gold band at the lower part of the board is the complete power supply and distribution circuit.  It is made up of the master IC and other components: Transistors, Diodes, Capacitors and resistors.  The 2 square black units below the IC are protection diodes which are intact. The 2 round black units are Capacitors, which appear to show a short circuit on the output of the IC.

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admin

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2012/11/30 - 16:36
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Thanks for the feedback and sorry for the problems you are having with cube-tablet.com.

Despite the name and from what I understand they don't seem to be related with the manufacturer and the feedback I read on the Internet for this shop doesn't seem to be very good Confused

Feel free to add some pictures to illustrate the different elements you have described on the motherboard.

 

About my dead tablet, I actually have no idea about which part died. I just know that I managed to start it after a disassembly, then it died for good, pretty sure it caught some static electricity. My plan was to keep it for some experiment at my local hackerspace Wink or give/sell some parts (buttons, case, display/touch screen...) 

What would you need exactly from my tablet and where are you located ?

Cheers.

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drguild
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2012/11/30 - 16:46
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Thought I did upload the image I have now and is in the previous post.

Basically it seems a IC fried on the mainboard and is causing a short circuit to the point that external power supplies could blow up as a result.

I know the company is different from the official manufacturer but thought the company I bought from would be more willing and open to helping me but unfortunately they aren't.

Generic responses telling me I probably damaged the tablet by opening it when it was already totally dead (we opened it to find the fault), telling me to see the original seller, and thinking I wanted to buy batteries etc when we asked for it to be fixed.

Just over half the emails I sent to them were ignored also.

I offered to work with them and even pay the shipping costs but was always met with a reply that I must send back in full they even told me not to tell the post office what I was sending at one stage.

I don't know if the official manufacturer will reply to me as I wanted the cube especially due to the community.

 

Now instead I kinda want the new Google Nexus 10 but I don't have allot of money and trying to save it up abit.

 

I pretty much hope anyone with a dead tablet instead of chucking it out could help me as there tablets could be usable for repair by others.

Also I'm in Perth Australia.


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drguild
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2012/12/19 - 07:31
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Well My dad dropped my tablet back to me I had a quick look and guess what the chip is the Lithium Charge IC and he misread the number on it, which I found you can buy so I just purchased 2 of them today.

I might be back with a cube after all if we can find someone to replace the IC for us.

 

If I get this working then up yours to the seller :D in a good way.

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lfontes
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2012/12/21 - 14:32
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Hi I'm from Argentina I have the same problem with my country's mail.
My u30gt also had power problems. But the chip that burned is another. I know nothing about electronics, maybe your dad puesa help me. I am attaching a picture which shows the chip failed. The chip was burned.  The chip is labeled as "WP1f" but do not know which to replace it.417.jpgImage Enlarger
thanks

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drguild
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2012/12/21 - 14:45
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From my limited initial looks it is a smd transistor (confirmed that much by google search) what specs/rating it is I do not know.

Mine reads WP1J which the J seems to be just a number used for manufacturing etc from what I gather.

Ill check up on it but if you can find a replacement one then all you need to do is find someone to desolder it and solder the new one in its place.

I was lucky to find the actual chip used online and order a couple as something like this chap I'm getting is a very lucky chance.

Also you need to work out why it blew so it doesn't happen again which ill be doing once this chip arrives and is in making sure we safe guard from future stuff.

Do you know anyone that does mobile phone repairs or general electronics in your area as you can take the board to them and they can probe around and find the problem etc which is what my dad did with my board.

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drguild
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2013/01/07 - 06:55
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Just got the replacement chips for the board.

I'm not going to attempt to replacement them myself Ill get someone skilled to do it over the next week.

Also I am going to make it a thing that we just don't replace the chips, that we also find out why the fault occurred in the first place and fix that up.

Ill update again once I have more info.

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bernhardh
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2013/02/02 - 22:39
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Hello!

I have also a electronical Problem with my U30GT.

I can plug the Adpater in, the Tablet starts up.  Then it loads up to 100%, but the Accus are cold.

When i pull out the Power Cord from the Tablet, BAMM, Power has gone and the Tablet is power off.

Then again: I plug in the Power Cord and the Cube starts up and begins to load at 1%.

All Functions are working fine, but it seems. the Accus can´t be loaded anymore.

It only works with the Power Cord.

Have you ever seen such a Problem??

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Jedi_gernic
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2013/02/06 - 23:57
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drguild said
cube-tablet.com has basically said they are not willing to help me anymore and I have to live with the laws in my country etc and refused to help me unless I sent the tablet in full with batteries which is illegal under EMS etc who they specify to use for warranty.

I tried soo hard to get them to help me even going as far as offering to pay myself for all shipping fees and trying to work out a solution with them which is legal as it illegal under my country and their service they do warranties by to send products with lithium batteries in them.

All they could offer me was to buy a brand new tablet as a warranty replacement and they knock there markup off, a measly $20 discount on a new product + shipping which doesn't even make up the full shipping cost.

In the end they are now ignoring my emails.

I have contacted the official Cube manufacture offering to work with them to get this sorted out and doubt I will get a reply.

So now I am totally out of my money unless the manufacturer helps me.

Here is my dads report on the tablet along with a image of the damaged part.

Admin if you cannot get your device to work and are ok with parting with it I mby might be able to use working parts from the mainboard to fix mine so don't just chuck it out ok.

 

>>Basically its a very simple fault.  The Voltage regulator (arrowed) Controls and distributes various voltages around the board.
The IC has failed with an internal breakdown of components and is placing an excessive load on the external wall wart.

>>Normally the plug pack supplies 12V this is pulled down to approximately 2V causing it to get extremely hot and if left connected would also fail and possibly erupt with a fire.

>>The IC takes its power source from both the Lithium Batteries (2) and the external Power Supply wall wart. Thus batteries are not charged as the charging circuit is also contained in this IC.

.......

 

DrGuild, could you make a picture of the BACKSIDE of this circuitboard? Especially the part from the external power supply to the battery connection. It seems that it is an option to use a good Li-Ion charger with the same small plug (i think 2,35mm-0,75mm) and connecting it directly to the battery - but the power should not go to the faulty loading circuit anymore so you would have to severe/cut some connections. I would like to see if that is difficult to do :-) My U30GT is open but I have not yet removed this board fully to see the backside.

Thanks!

 

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drguild
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2013/02/07 - 09:29
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Jedi_gernic said

drguild said
cube-tablet.com has basically said they are not willing to help me anymore and I have to live with the laws in my country etc and refused to help me unless I sent the tablet in full with batteries which is illegal under EMS etc who they specify to use for warranty.

I tried soo hard to get them to help me even going as far as offering to pay myself for all shipping fees and trying to work out a solution with them which is legal as it illegal under my country and their service they do warranties by to send products with lithium batteries in them.

All they could offer me was to buy a brand new tablet as a warranty replacement and they knock there markup off, a measly $20 discount on a new product + shipping which doesn't even make up the full shipping cost.

In the end they are now ignoring my emails.

I have contacted the official Cube manufacture offering to work with them to get this sorted out and doubt I will get a reply.

So now I am totally out of my money unless the manufacturer helps me.

Here is my dads report on the tablet along with a image of the damaged part.

Admin if you cannot get your device to work and are ok with parting with it I mby might be able to use working parts from the mainboard to fix mine so don't just chuck it out ok.

>>Basically its a very simple fault.  The Voltage regulator (arrowed) Controls and distributes various voltages around the board.
The IC has failed with an internal breakdown of components and is placing an excessive load on the external wall wart.

>>Normally the plug pack supplies 12V this is pulled down to approximately 2V causing it to get extremely hot and if left connected would also fail and possibly erupt with a fire.

>>The IC takes its power source from both the Lithium Batteries (2) and the external Power Supply wall wart. Thus batteries are not charged as the charging circuit is also contained in this IC.

.......

DrGuild, could you make a picture of the BACKSIDE of this circuitboard? Especially the part from the external power supply to the battery connection. It seems that it is an option to use a good Li-Ion charger with the same small plug (i think 2,35mm-0,75mm) and connecting it directly to the battery - but the power should not go to the faulty loading circuit anymore so you would have to severe/cut some connections. I would like to see if that is difficult to do :-) My U30GT is open but I have not yet removed this board fully to see the backside.

Thanks!

I don't have the tablet with me at the moment, we have been trying to find someone to replace the chip without much luck though we haven't been looking too hard anyway as were not sure where to look.

 

If I get a chance to look at it Ill get a photo of the back but that chip also does a couple other things I think than just charge the tablet I think it also draws the power etc for the mainboard.

 

So would be hard to bypass it anyway and I have 2 chips here incase one doesn't work they can be gotten odd ebay pretty cheap if needed.

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bernhardh
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2013/02/07 - 13:06
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Hello!

I opened my Cube u30GT and connected it with the External Charger.

After some Hours, the Chip described from "lfontes" is getting real Hot!

I think its the reason why i can´t load the Accus.

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Jedi_gernic
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2013/02/07 - 23:08
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bernhardh said
Hello!

I opened my Cube u30GT and connected it with the External Charger.

After some Hours, the Chip described from "lfontes" is getting real Hot!

I think its the reason why i can´t load the Accus.

 

Do you have a multi/voltagemeter? I measured the voltage of the batterypack without and with the charger connected and measured no difference (just above 6V), that is a better indication than a component getting hot that no loading is happening. The charging circuitry will load the battery faster in the beginning and will slow down later, during this initial phase components could get hot.

 

I even disconnected the battery pack and measured the voltage at the connections with the charger connected, there was a fluctuating voltage ranging from 0 to just over 8V. So it is not totally damaged but the remaining charge function is not enough to charge the battery, BTW even with battery disconnected the Cube works fine with only the charger....

We just need a way to charge the battery directly without opening the Cube every time Cry

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Steve J
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2013/03/19 - 10:42
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Hi all. 

       I have the same problem as bernhardh where by when the charger is plunged in the tablet works fine and the recharge indicator starts at zero and charges to 100% then you pull the charger out and the tablet just dies, you then replug the charger and the tablet works fine again and starts to recharge once again from zero.

It dose this all the time and can only use the tablet with the charger plugged in.

 

Any Ideas guys.

 

Steve. J. Cry

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drguild
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2013/03/22 - 07:38
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Got that component replaced by someone locally but tablet is still dead the next in line component the processor (nopt the big main one) labeled WM8326G was shorted and getting really hot and theirs no way Ill find that unless I get a dead tablet.

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