Author Topic: EEVblog #822 - World's Worst Tablet Computer Teardown  (Read 54414 times)

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Online janoc

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #125 on: December 01, 2015, 11:04:48 pm »
The question is:
What the heck was it's purpose?
This looks to me like a one off thing that pretends to be a commercial product. Something for trade fair visitors to play around with on a booth.

My guess is that it is some sort of display (or a demo unit of) for an operating theater. Having a very sensitive touchscreen that  you don't actually have to touch to make it work would be beneficial, as is the "sealed" look that can be washed with a disinfectant. 

Similar things have been at least tried for displaying medical documentation to surgeons during surgery. I have seen it done even with stereo cameras and later on with Kinect, so that the surgeon can just wave hands at the screen and doesn't have to touch it (sterility issue).

According to their website, Esinomed has been making things like xray/MRI viewers, so this would be right up their alley.

 

Offline Godzil

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #126 on: December 01, 2015, 11:45:48 pm »
I don't know if anyone put a comment on that, but :

First:
If you reverse the name of the company Esinomed what do you have?????

Demonise! :D

Second:
For the case, it's in fact something really cheap to be made and is not molded at all, and at first glance on the video I was thinking the same as Dave, but not after a few seconds. It's something hand made, and I suspect that all the device made are sensibly different on the case, and the quality could be much much more better than that, they didn't even put any pride on the case, tbh. I don't speak about the inside which Dave show how it's awful :D
« Last Edit: December 01, 2015, 11:50:16 pm by Godzil »
When you make hardware without taking into account the needs of the eventual software developers, you end up with bloated hardware full of pointless excess. From the outset one must consider design from both a hardware and software perspective.
-- Yokoi Gunpei
 

Offline blueskull

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #127 on: December 01, 2015, 11:55:25 pm »
Demonise! :D

Never realized that point. Good discovery!
 

Offline CatalinaWOW

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #128 on: December 02, 2015, 05:53:20 pm »
This is a schlock piece of work, but have those demonizing the battery pack ever soldered batteries?  The end caps are some variant of steel, often stainless.  Too much heat ruins the battery.  With the right flux and equipment it is barely possible.  That is why professionals almost always weld either wires or solderable tabs.

Over the weekend before the trade show, the junior engineer or intern didn't have and couldn't get tabbed batteries, and didn't have access to a welder.  Many, many shops don't have one, including mine.  The bodged batteries barely fit (Dave had to pry them out) so a battery holder was out of the question.  So they spent several hours getting this battery pack sort of soldered together.  Corrosion and battery effluent indicates that they did overheat the seals and damage them on several of the joints.  But they beat the Monday deadline.

The power supply board is also typical of a first effort by a junior person.  In school they had a few theory courses.  They draw a schematic (maybe leaning on an app note, maybe being overconfident and doing it on their own).  Build it.  Of course they don't know about commercial prototyping shops, and besides, it's Friday afternoon and the project is due Monday morning.  Find out they didn't really understand the spec sheet.  Start cutting and bodging until something works.  Learn a lot about soldering during their first build, but still have much to learn.

Fortunately the marketing department has a label printer, so that part looks professional - even the implication that this concoction has worked ten times before.  Marketing never lies, do they?

The final touch -after that lost weekend the product ended up in the dead ends bin in the CEOs office.  Either it didn't work after all when powered on at the trade show, or the software was so dodgy that no one was interested, or there really wasn't a market or (drum roll) after all this rush they were late to market and someone else got whatever business there was.
 

Offline technix

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #129 on: December 02, 2015, 06:05:17 pm »
If you are willing to I am thinking undoing the hack and restore the machine into some appropriate things. The screen screams Raspberry Pi attachment and the SBC can be reused as a HTPC if it decodes 1080p.
 

Offline Augustus

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #130 on: December 02, 2015, 06:22:49 pm »
Over 450.000 views and counting... Not the record yet but it has the potential   :P

Thought the "student apprentice" theory was the most convincing. Plus, maybe done by a software guy.
Greetings from the Black Forest, Germany
 

Offline retrolefty

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #131 on: December 02, 2015, 06:48:14 pm »
Over 450.000 views and counting... Not the record yet but it has the potential   :P

Thought the "student apprentice" theory was the most convincing. Plus, maybe done by a software guy.

 Well it sure wasn't done by anyone considering themselves hardware guys. The soldering shown of the batteries looks like someones very first attempt at soldering.   :--



 

Offline 6581

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #132 on: December 04, 2015, 03:36:59 am »
The comment about a battery holder is fairly stupid as well, Dave, since those have the risk that any jarring or drop will make the batteries disconnect.

I've done a battery pack using holder + zip ties and at least it handled just fine inside a motorcycle. Sure, not your first choice for production run, but in a small quantity for a prototype kind of device - at least much tidier than the vomit we saw on the video.
 

Offline Smokey

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #133 on: December 05, 2015, 01:44:24 am »
... but have those demonizing the battery pack ever soldered batteries? 

This ties in with the Metcal thread.  The big Metcal tips solder to battery terminals no problem without dumping too much heat into them.  Now I'm using my own precision calibrated eyeball to measure what I mean by "too much heat" but I haven't had a soldered battery explode on me yet so I think I'm good to go.
 

Offline Chipguy

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #134 on: December 05, 2015, 07:23:34 am »
I had to solder batteries myself in the past for prototypes, but what I did was to go into town and get some AA cells with already attached soldering lugs.
Here are some examples from a German online store:



This still does not look pretty (in my book) but I don't have a spot welder and I had no time to wait for a customized battery pack from my usual supplier.
Still much better than the Esinomed Desinomed demonised hackjob  :palm:
For those who want to know (in Germany) who does customized packs, starting at 1 pcs: http://www.goeke-shop.de

Example: 3 Cell 3.6V NiMH pack, 3800mAh, 18650 size (dia 17mm ; lengh 67mm) temperature sensor (Epcos), temperature fuse (Pepi, resettable) and 3 pin Molex connecter (PC fan type) costs around 20 EUR, fully customized in small quantities.
Where is that smoke coming from?
 

Offline rs20

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #135 on: December 05, 2015, 07:54:16 am »
I had to solder batteries myself in the past for prototypes, but what I did was to go into town and get some AA cells with already attached soldering lugs.
Here are some examples from a German online store:

...

This still does not look pretty (in my book) but I don't have a spot welder and I had no time to wait for a customized battery pack from my usual supplier.
Still much better than the Esinomed Desinomed demonised hackjob  :palm:
For those who want to know (in Germany) who does customized packs, starting at 1 pcs: http://www.goeke-shop.de

Example: 3 Cell 3.6V NiMH pack, 3800mAh, 18650 size (dia 17mm ; lengh 67mm) temperature sensor (Epcos), temperature fuse (Pepi, resettable) and 3 pin Molex connecter (PC fan type) costs around 20 EUR, fully customized in small quantities.

None of these things are available from the corner store.
 

Offline blueskull

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #136 on: December 05, 2015, 08:00:48 am »
In my hometown, a large but not very developed Chinese city, almost every bare cell seller in both of the 2 major electronics markets, offers spot welding and cell packing service.

Anyway, an improper, just work, transformer style spot welder costs <$100 if bought online, and can be build <$5 from a broken microwave oven.
 

Offline Chipguy

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #137 on: December 05, 2015, 08:13:27 am »
None of these things are available from the corner store.

Ok lets see, if I want a custom self made weirdo AA battery pack in weirdo shape, TODAY with parts from a local shop:


12 pieces available


4 pieces available


Ok that one is a problem, so I would need to go without and come back in 3 days

And finally:

6 meters available, that's more than enough.

I am not bothering to look up the molex connector since around the corner of that shop are man PC part shops.
I could just go in there, get the worst PC fan ever and cut the leads of.

So I could just get into town today, get everying beside the temperature switch that I might just get from another shop and I would be able to make a battery pack TODAY.

Edit: Doh... I need to find out if it's possible to resize the images.. they are much larger than the thumbnails on the website.
Where is that smoke coming from?
 

Offline rs20

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #138 on: December 05, 2015, 08:17:46 am »
I'm talking about my corner shop. Ain't never seen those batteries with tabs for contacts before in my life, let alone in any shop that I know I can walk into nearby.
 

Offline bktemp

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #139 on: December 05, 2015, 08:39:32 am »
None of these things are available from the corner store.

Ok lets see, if I want a custom self made weirdo AA battery pack in weirdo shape, TODAY with parts from a local shop:
I don't think there are much local shops in Prutting selling this kind of stuff...

Except from that, let's asume this project was done by a student. Most likely they gave him the computer module + display + touchscreen controller and he had to add only the battery + power supply and put everything into a nice looking case. As a student with almost no experience he maybe didn't know about batteries with welded tabs or he bought the batteries and tried to put them into a battery holder, but later he realized it does not fit into the case. Because he did not want to buy new ones or he had no time to do it, he soldered them together. It is certainly not the best way to do it, but the quickest and often the only solution when you need to make it working right now.

Many of us here on the forum have many years of experience in designing and building electronic devices. But this tablet computer clearly looks like it was built by somebody with much less experience. Therefore it is a bit unfair to criticise every detail he could have done better. Yes, it looks bad, but it works and it looks ok from the outside. That is more important.
« Last Edit: December 05, 2015, 08:47:12 am by bktemp »
 

Offline Chipguy

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #140 on: December 05, 2015, 09:16:56 am »
I'm talking about my corner shop. Ain't never seen those batteries with tabs for contacts before in my life, let alone in any shop that I know I can walk into nearby.
DOH!

Ok, my shops are in a bigger city. Not huge but in 2013 official 514.137 people lived here.
Where is that smoke coming from?
 

Offline continuo

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #141 on: December 05, 2015, 09:22:17 am »
These "lugged" cells are readily available at most stores who sell rc model stuff. At least here in Germany. You usually wont get them at regular shops. Using the right tools (iron with some serious oomph, fat chisel tip) it's also usually no problem to solder wires to regular double A's. This hackjob looks like if it's done with a 15w firestarter, equipped with a 1mm pointy conical tip and using high melting lead free crap. A full 5 out of 5 facepalms  :palm:
« Last Edit: December 05, 2015, 10:28:54 am by continuo »
 

Offline Chipguy

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #142 on: December 05, 2015, 09:22:48 am »
Prutting only has 2300 inhabitants.
The next "Conrad electronic" is 50km away, in Munich. Ok that one hour drive almost.
Rosenheim in nearer though, around 60.000 inhabitants. I don't think they got an electronics store that would sell those.

Well, from a infrastructure point of view that company is pretty screwed. However since most of the stuff is coming by parcel anyway it does not make a big difference.
Where is that smoke coming from?
 

Online Yansi

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #143 on: December 05, 2015, 10:01:17 am »

If you reverse the name of the company Esinomed what do you have?????

Demonise! :D

Wow that's one heavy joke :D
 

Offline ivan747

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #144 on: December 05, 2015, 11:07:19 am »
Prutting only has 2300 inhabitants.
The next "Conrad electronic" is 50km away, in Munich. Ok that one hour drive almost.
Rosenheim in nearer though, around 60.000 inhabitants. I don't think they got an electronics store that would sell those.

Well, from a infrastructure point of view that company is pretty screwed. However since most of the stuff is coming by parcel anyway it does not make a big difference.

50km, one hour? I thought this was Germany ;)
 

Offline Brumby

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #145 on: December 05, 2015, 12:22:15 pm »
Google directions from Prutting to Munich offer the shortest route of 75.7 km, taking 1 hour.  It's about 53 km as the crow flies.

... depending on exactly where in Prutting and Munich we aim for.
 

Offline Chipguy

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #146 on: December 05, 2015, 12:25:13 pm »
50km, one hour? I thought this was Germany ;)

It's Munich  >:D
Just for the heck of it I just asked Google how long it would take to get from Prutting to Conrad Electronic in Munich.
Google answered: 59 mins (including 5 mins for traffic).
Sorry, sorry, I was 1 minute off  ;D
Where is that smoke coming from?
 

Offline Brumby

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #147 on: December 05, 2015, 12:27:33 pm »
... and that's not taking into account stops for petrol or taking in the scenery.

I wouldn't mind checking out Bavaria.  One day, maybe.



50km, one hour? I thought this was Germany ;)

It's Munich  >:D
Just for the heck of it I just asked Google how long it would take to get from Prutting to Conrad Electronic in Munich.
Google answered: 59 mins (including 5 mins for traffic).
Sorry, sorry, I was 1 minute off  ;D


That's OK - I just did the same - and it gave me exactly one hour.  Your estimate was spot on in my book.
 

Offline ivan747

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #148 on: December 05, 2015, 10:30:44 pm »
50km, one hour? I thought this was Germany ;)

It's Munich  >:D
Just for the heck of it I just asked Google how long it would take to get from Prutting to Conrad Electronic in Munich.
Google answered: 59 mins (including 5 mins for traffic).
Sorry, sorry, I was 1 minute off  ;D

Oh Germans  ;D
I bet both estimates are accurate to 30 seconds.
 

Offline Klomderper

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Re: EEVblog #822 - World's Worst Tablet Computer Teardown
« Reply #149 on: December 06, 2015, 05:33:09 am »
Esinomed - LOL Spell it backwards. DEMONISE-portray as wicked and threatening.
 


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