Screen replacement for Joyous J-3862 (MTCD) - MTCD Android Head Units Q&A

A year and a half ago I bought Joyous J-3862 from DealExtreme. It was working OK until the past few days when touch screen just died so only the top third part of the screen was responsive to touches. Being a computer engineer myself and electronics being my hobby I spend a lot of my free time at I disassembled the head unit and tried every possible way to try and fix the touch screen to no avail (from re-seating flat cables to re-soldering connectors with hot gun).
Then I managed to get the markings on the flat cable for the touch screen (GT911) so I did some searching but none of the available touch screens were fitting my device because flat cable for my device is located in the center of the smaller side of the screen while touch screens available online had it in different positions but on the larger side of the screen. Anyway, knowing I have nothing to lose because I had a faulty unit (Joyous website nor any usable contact information is available anymore, and using a mouse to control head unit makes no sense) so I went further to disassemble the screen and after all my effort it cracked in the last phase of disassembly.
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Then it hit me since this head unit's touch screen was unfixable. I've see a dozen of same looking head units being "branded" by at least 20 different brands I decided to contact Joying (they're resellers only but still seem to have quite a support up and running) to see if I could get my hands on the replacement screen but of course they told me their screens are not compatible with my head unit and they'd rather sold me the new one. While it might be true some of their screens are not fitting, I'm sure at least one is compatible because they don't produce damn things - they just put their own logo and sell it.
So, does anyone have any smart idea where I should be looking for screen replacement? I understand my unit is old enough but if screen replacement is cheaper than the new head unit I'd go with the replacement. Or if anyone is interested to buy both boards (smaller with Rockchip and bigger for other things) I could arrange something like that.

Related

How to change OEM digitizer ?

I want to change my OEM digitizer with a new one. I've bought it but it comes with no installation guide.
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Anyone have a guide ?
Look at this: http://rapidshare.com/files/133052958/Diamond.pdf
wow it's too hard ..
i would only replace digitizer but this guide shown that i've to disassemble a thousand of components if i would access the digitizer
Did you change the digitizer???Because i have the same problem
All your devices are still under HTC warranty! Why do you want to do it yourself?
salada2k said:
All your devices are still under HTC warranty! Why do you want to do it yourself?
Click to expand...
Click to collapse
Because warranty service in Bulgaria until now no change is digitizer.They just do not know how to change this part.What do you advise me to do?
...In Bulgaria there is no representation of HTC.
I would call HTC and ask them what to do. I'm sure you could send it to them!
Can't you just take off the front isn't only just stuck there with double sided tape ?
I replaced the touchscreen in my Touch Dual and the hardest part was to find the right part after a hopeless and unhelpful ebay seller sent me the wrong part (still waiting for my refund) Once I got the correct part it was about 30mins work to swap it. I used double sided tape as the replacement parts don;t come with a gasket. I just cut my own and it stuck fine. Make sure you place parts together in stages of dis assembly as there's a few and some of the screws look the same but have different threads. I would have thought the diamond would be easier as it has no moving parts. Good luck.
link is broken
I have just stripped my Ignito (touch diamond) and it was no big deal but easily the most complicated phone I've dismantled. You dismantle the phone then peel the front clear skin off the digitiser, then gently lever-out the screen & digitizer together then split them. The LCD is VERY fragile, so use a real thin tool (like a feeler gauge) and go slowly to allow the glue time to come apart.
The digitizer and LCD ribbons are soldered together BTW so you'll need to use a soldering iron with a very fine tip to re-attach. I wrap some copper wire round a regular soldering iron tip for stuff like this to keep the heat input down.

How I resolved the joystick issue (C600)

Hi folks my other half who has a C600 has complained about joystick issues for a while now so I finally did something about it (sick of her complaining about her 'crap phone' - ungrateful #!&@! ), not sure if this is THE issue with the c600 joystick so would be interested in any feedback good or bad.
Basically the joystick became less and less responsive over time so harder presses were necessary to perform actions. Didn't fancy spraying WD40 in my phone (what does this actually do?) and after testing switch operation with my meter all seemed ok.
What I noticed was that the piece of metal holding the joystick is stamped to a lower level than the rest of the metal chassis holding the keyboard. This section is only supported at one end and therefore, every time the joystick is moved a bending action is exerted on this 'sub chassis'. Hopefully this picture might help people understand what I am on about...
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Now I found that by simply bending this piece of metal back up a little bit I restored the joystick to it's former self! No cleaning, NO WD40!
Now just to note I didn't mess around but I suspect the problem might return in time so maybe these phones are missing a bit of support between the joystick chassis and main board? Maybe someone messing about might want to investigate sorting this.
Hope this is useful to someone although I realise it is coming a little late in the C600 lifetime!
I just thought on if I get enough requests I could do a decent photo guide for stripping the C600 and maybe the VOX too.
What I do is clean all the dust out of the rubber piece that's over the joystick in my T-mobile SDA, and then spray the joystick with quick dry electrical cleaner (usually available at your local car parts store).
Hi thecraze, yes being an electronics engineer I am aware of switch cleaner. I realise in my case however this was not the issue, as all switch contacts showed a good low resistance with little effort on the joystick. There was also negligible dust too.
I have also noted that cleaning does not work for everyone, and this may be one of, if not the contributing factor in such cases.
Thanks anyway.

What tools do I need to replace the screen on HTC Shift?

Will I need different shaped screwdrivers or will a regular (small sized) Phillips & or flat head screwdrivers be all I need?
While I was looking for screens on eBay and Amazon I saw some that came with tools. One of the screwdrivers that came with one of the screens looks like a star so now I'm wondering if there are any star shaped screws holding the screen down that'll need a star shaped screwdriver to open it with.
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I hope replacing this screen doesn't end up becoming a huge pain. Will I be okay buying just a screen for $5 or should I pay almost 3 times as much to get the tools?
This is the screen I was originally looking at for $5.55 http://pages.ebay.com/link/?nav=item.view&id=110787423167
Thanks for your suggestions!
When I got a new flex cable it came with the tools needed. BUT I found that a screwdriver I bought from radio Shack had better fitting tips. I'll try to find a link later today if I can.
Edit: I think what I'm referring to is called; RadioShack® 21-Piece Precision Electronic Driver SetCatalog #: 64-185 *|* Model: 6400185 for $17.49
This should be in Q/A. But that being said. I would spring for the kit that comes with the Tools. Especially if you do not have the correct tools. Yes you are going to need the Star shaped Screwdriver. Not for the Screen itself, but to be able to get to it. Also a few other suggestions. One make sure you watch the Video linked in THIS thread on how to disassemble the Shift. That thread also has pics you should study a bit. Another thing that I cannot stress enough. HAVE A CLEAN WORK AREA TO DO THE REPAIR. It will save you a bunch of headaches. Take your time. Do not try to rush the procedure. Lastly, make sure that the work surface, and you are properly grounded. This will avoid any issues from static discharge. Read, and take your time. It will save you grief later on .

[Q] No signal after screen replacement: Damaged motherboard?

I was doing a screen replacement on a Nexus 5 and a small part from the motherboard fell off.
3 pictures to illustrate the problem here:
http://min.us/mKOC4FQe6F0HI
Afterwards, the mobile connection was a lot worse than before. Now, 2 weeks later, the phone's connection has become unusable and it constantly shows no service. Only very rarely does it have any sort of connection (Edge/3G/H/4G).
Questions:
1)What is the part that came off? (see album above) My knowledge is a bit limited but I'm quite sure it has to do with the connection? I notice there are 3 other parts exactly like this spread over the motherboard.
2)Can I repair it? Do I glue it back on? Do I solder it on? Does it somehow click on? (I have tried if it clicks but this part is so tiny it's almost impossible to really handle
3)Based on my explanation, do you think this tiny part is the only cause? The phone still had some connection at first but it got worse. I'm also planning to order replacement antenna cables to see if that helps.
Thanks in advance!
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In my case.. I had to replace the charging circuit Cuz it was 'broken' as described by the cellphone shop.. It has connections to the antenna.. Now phone is fully working.. Before that though, I tried different sim cards with different companies (bell Rogers and fido) all worked on my phone except my carrier sim card (mobilicity). After replacing the circuit I just mentioned everything works fine. Cost is 25$
Needs solder it's an rf trimmer /radio frequency. It's vital to an ariel of one type or other. If you want to risk a bodge assemble everything except the back and hold it in place with bluetack. If it works I was going to say epoxy it but don't. Get someone to solder it. It's easy to do if you have the skills.
Oh vital it's right way round and has now been turned. There should be a slot for tuning it.

[Completed] Living with cheap smartwatches. My life with a Hi Watch U8 Pro and a DZ09.

I've worn my Hi Watch off and on for over a year now.
I has served me well considering how little it cost. I've managed to use most of the features and the battery is still going.
So why did I buy a DZ09? Partly out of desperation. The Hi Watch has a deeply recessed usb charge port. The Micro USB supplied is slightly longer than any other I own. It is the only cable that will work and when it inevitably goes missing I am watch-less until it resurfaces. The DZ09 was cheap, it was shiny and there was a slim chance the charger cable would fit the Hi Watch.
Guess what... it doesn't.
But that's OK, the old cable turned up again and now I can use both and compare them to my hearts content. :laugh:
If anyone has any questions, I will try to answer them. I will also include the odd mini revue of different functions and any apps I encounter along the way.
Hopefully it will be of interest to someone, so here goes...
A note about straps.
I've never changed the straps on these watches. However, the Hi Watch (U8 Pro) will probably change fine. It has tiny hex bolts holding the strap on which are clearly visible.
The DZ09 is another story.
Upon inspection I discovered that the the strap is hollow. A wire (presumably an antenna) is tucked inside. So my plans to buy a funky two tone strap may have to go on hold.
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The DZ09 has much jazzier screen layouts and a choice of backgrounds.
The metal bits on the DZ09 appear to be actual cheap metal as opposed to the painted plastic of the Hi Watch.
Sent from my SM-N910F using XDA Free mobile app
Hi,
I see you've used the "other smartwatches" section alrwadt, which is where this could be posted.
Xda Assist is here to help navigate the site, not for support or info. So you won't get replies here.
Thread closed.

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