Ghost or phantom touches

[Tomas]

Hello, is here anyone who definitely solve the ghost touches problem? On my Chuwi Vi10 SN: Vi10 Q32G22151000xxx occurrs the ghost touches when the CPU temperature raise. I decreased the passive temperature to 60°C in BIOS-Thermal control. This little help. I also applied the solution from Russian forum (isolating the flex cable). Is it better, but not perfect. Before the ghost touches appeared after few second in game. Now after 5+ minutes in game or surfing on the web. My next step will be to better isolate the SOC from rest of components. I already contacted Chuwi support for help. Thanks for any response.

[Miika]

Hi!

Don’t know exactly what I did but here’s my situation:

First I noticed phantom touches here and there but It did not bother me so much, I’m used to chinese oddities. After using the tab daily for a couple of months it became worse I got really fed up.

After monitoring the situation I noticed that it had something to dot with temperature rising after some use.

Took of the screws like a boss, removed the back panel gently like petting a baby seal, admired and jiggled the connectors and cables (pointed out by Dave R). Nothing.

Started some heavy load apps to get the heat up but there was no phantom touches anymore with or without jiggling the connections.

Put back the back panel in disbelief and did not quite understand what happened between me and my tab.

Again ran some heavy load to the tablet with back panel on (of course thinking nothing had changed really) when outside to watch stars and think universe (to smoke)

And after this adventure I have not seen any phantom touches for a couple of days.

I’ll keep you guys updated if something dramatic happens.

YT, Miguel Von Hankmonsen

[Riccardo]

I’ve the same problem on windows 10, anyone can say if the same problem was in windows 8.1 too?

[Riccardo]

I tried to disable turbo option. Go to bios (when windows start i keep vol.+) power than disable turbo. I hope this was an heat problem, now are three hours i work with the tablet and i don’t see any phantom touch.

[Dave R]

Hi all,

I still have this issue and have been using the tablet with the touch screen disabled in Windows 10 – I tried the steps here:- http://4pda.ru/forum/dl/post/7181430/IMG_20151129_215042.jpg (Shielding the cables etc) and it made no real difference, I agree it looks like a heat thing as it ‘seems’ to start off ok, I did try cooling various parts but it was the same. Turning turbo off is interesting and I’m going to give that a try! I’ll report back,

Best,

Dave

[Phuturist]

Dave R wrote:

Hi all, I still have this issue and have been using the tablet with the touch screen disabled in Windows 10 – I tried the steps here:- http://4pda.ru/forum/dl/post/7181430/IMG_20151129_215042.jpg (Shielding the cables etc) and it made no real difference, I agree it looks like a heat thing as it ‘seems’ to start off ok, I did try cooling various parts but it was the same. Turning turbo off is interesting and I’m going to give that a try! I’ll report back, Best, Dave

How did it play out? Did turning off the turbo help with this issue?

[Miika]

So it got back.

Yesterday I started to investigate the root cause of this. I just wanted to fix this even risking the whole tablet, I was very fed up.

I opened the case and checked the digitizer cable coupling with magnifier and saw that some assembler was having bad day when this tab was built in china.

The flat cable was not fully inserted into the socket (a bit misaligned). After placing it poorly the assembler glued the cable to the socket…. …..

I removed the cable CAREFULLY with pliers and started cleaning the socket. Glue was everywhere between the small pins, so I had to start cleaning them with precision tools. Be very careful those pins are very very thin. I managed to bend some of them but all and all the cleaning went nicely.

NOTE! Latch securing the cable comes off very easily and is a bit hard to get back on. So patience!

After this I had a clean socket and a clean cable. Connected the cable and behold the screen worked like a charm.

Now it is working fine but the touch calibration got a bit misaligned for some reason, so I’ll check how the calibration can be resetted.

I did some initial testing with heavy load to get the tab warm and I did not get any ghost touches. I’ll follow the situation if it appears.

Conclution: It seems that the touch screen flat cable socket is very fragile and poor quality. In my case it was poorly assembled in factory and heat generated interference/shorts to the misaligned connection. Don’t know if this is the root cause but we’ll see.

[Jonathan]

Miika, thanks for posting back your results and experiments so far. I’ve been keeping an eye on this thread since I have a phantom touch issue too. This latest find looks promising, it seem plausible that as your tablet heated up the cable/connector expanded and caused an intermittent connection failure. BTW, I’m of the opinion that the glue could have caused the calibration issue, it would have a different relative permittivity to that of air and would have caused a slight change in capacitance (which is a fairly critical parameter for a capacitive touch screen).

[Pepe]

have the same problem, I hope that’s the solutionnks for the info I have the same problem, I hope that’s the solutionMMiika
ThankMiika
Thanks for the info I have the same problem, I hope that’s the solutions for the info I have the same problem, I hope that’s the solutioniika
Thanks for the info I have the same problem, I hope that’s the solution
Thanks for the info I have the same problem, I hope that’s the solution

[Miika]

So the journey continues. So it was not a calibration issue but a “real” issue. Touch accuracy was fine but there was this 1 cm region in the bottom of the screen which did not respond to any touch. Worst case scenario was that I had broke the screen somehow but there was this “feeling” that the same issue continued, the connector was not properly attached.

So open the back panel again (at this point I had lost 2 screws already, so keep them safe like a new born baby). The black connector lock was at this point pretty broken so I blamed this little piece of plastic. Conclusion was that the plastic strip was not pressing the cable properly because due to several attach/deattach attempts it looked pretty crooked. I got some insulating tape strips and with tweezers inserted couple of them to the cable, just under the locking plastic thingie. Pressed the lock tightly but oh so gently in place and also added some tape on top of the locking mechanism.

Seems a bit rough and ugly solution but without new main bord / connector this was the only option with available tools and beer.

But after using the tab daily after a week it seems that the whole panel works and ghost issues have not reappeared after this epic journey.

I’ll keep you updated if anything happens. But If there is still some issues, I’ll probably throw this to a local river (avoidin local ducks) and get some good book and nice glass of whiskey.

Miika

 

[john]

I have the same problem in my Vi 10. I contacted Gearbest and they just offer me a 18USD discount in the next purchase.

I will decrease the passive temperature to 60°C in BIOS-Thermal control and disable turbo option, as Tomas said and see what happen, but up to now I prefer not to open the device.

[ImADev]

john wrote:

I have the same problem in my Vi 10. I contacted Gearbest and they just offer me a 18USD discount in the next purchase.

So you get a partial refund of $18, but you’re left with a touch screen that doesn’t work correctly. That doesn’t sound like a good deal to me.

GearBest will normally give you some options e.g. send the tablet to China (it isn’t cheap to send a tracked parcel to China) and get sent a replacement or you keep the tablet and accept a partial refund. Their third option is that you pay $100+ and they’ll send you another tablet. It’s basically the same as option #2, but instead of the partial refund going to your GearBest wallet it’ll be applied directly to a new order.

None of GearBests return options involve you getting a replacement for free. It’s absurd IMO because you might of bought the tablet from their USA, EU or UK warehouse yet they’re expecting you to pay to ship the tablet to China. Any half decent company would accept returns to their local warehouse and then send you a replacement once they receive the defective unit.

[Jonathan]

“Any half decent company would accept returns to their local warehouse and then send you a replacement once they receive the defective unit.”

Gearbest aren’t a half decent company, I doubt they’re even 1/16 decent 🙂 To add insult to injury I think those wallet refunds expire at the same month each year so you can’t even accumulate them (could be wrong on that).

And Chuwi, I think are going to end up on my blacklist along with Onda and Pipo. They don’t seem to design their hardware to work at a sensible temperature range (I get issues below 17C and when the tablet is pushed enough to warm it up). The two full sized USB ports are insanely handy but on mine when transferring data the KB touchpad packs up! Poorly designed hardware…

[ImADev]

GearBest don’t like to refund to PayPal, so it wouldn’t surprise me if wallet credit expires. It’s yet another way for them to make more money.

My tablet works fine with Android, but once I boot Windows the screen receives ghost touches. It’ll stop after a few minutes and then it might start doing it again after 30-45 mins. I installed the “multi touch test” app from the Store so that I could visually see where the screen was receiving the touches.

Newer versions of the Vi10 definitely have a poor digitizer and these tablets aren’t assembled in a dust free zone. Chuwi are doing everything they can to reduce the costs and unfortunately it shows once you power on the device.

[john]

ImADev wrote:

john wrote:

I have the same problem in my Vi 10. I contacted Gearbest and they just offer me a 18USD discount in the next purchase.

So you get a partial refund of $18, but you’re left with a touch screen that doesn’t work correctly. That doesn’t sound like a good deal to me. GearBest will normally give you some options e.g. send the tablet to China (it isn’t cheap to send a tracked parcel to China) and get sent a replacement or you keep the tablet and accept a partial refund. Their third option is that you pay $100+ and they’ll send you another tablet. It’s basically the same as option #2, but instead of the partial refund going to your GearBest wallet it’ll be applied directly to a new order. None of GearBests return options involve you getting a replacement for free. It’s absurd IMO because you might of bought the tablet from their USA, EU or UK warehouse yet they’re expecting you to pay to ship the tablet to China. Any half decent company would accept returns to their local warehouse and then send you a replacement once they receive the defective unit.

Yes, I can send the tablet to China. Then after 1 month I will receive another chuwi with the same error because it’s a design error.

They don’t offer refund in Paypal. All i can do is send to China or accept 18$, what is better?

[Author]

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