I am one of many who has replaced a screen assembly on Verizon Galaxy S4 only to discover that the capacitive buttons stopped working after replacement.
This is what I did to fix it:
I've examined the old and new capacitive buttons flex cables and noticed that they have an IC chip soldered to it and that the new screen has a higher revision number printed on capacitive button flex cable. The chip itself on the replacement screen also has a higher number printed on it than the old one.
So I've tried swapping the 16-legged IC chip between the old and new cable using a hot air station. Turned on the phone and -miracle - capacitive buttons are working again!
The newer version of the chip must not be recognized by the old motherboard or old MDK bootloader.
Long live my MDK S4 !
Related
So I cracked my LCD screen, bought a replacement, opened up the phone w/ little incident (man they really do cram a lot in there!) and I powered it on.....
the screen is just white, if I fiddle with the connection at where the LCD connects into what I believe is the digitizer I can kind of see a keypad button layout.
What do these symptoms describe and does anyone have a link to the service manual?
Thanks in advance for your time.
I had to replace the LCD on a wizard so here my experience... Make sure the two data ribbons are inserted securely. Also, before you power on, plug your hermes into your computer (assuming your computer is on and logged in as an admin) via USB (this sounds weird but I had to do this for some reason....) and then turn on the wizard.
If you still have a problem, you may have damaged something more than the screen.
Good luck.
Ok I will give plugging it in a shot.
Before you plugged it in what did it do when you powered it on?
anyone else have any input on what the issue could be?
It could be wrong LCD. There are two types of LCD for hermes/wizard with same connector but they are different. One is with gold flex cable, the other is with black flex cable. First one is most popular on wizards, the other on hermes. Check what was the color of your previous lcd flex cable and the new one.
Instructions
Can anyone post the instructions on how to take the lcd apart ?
I have gotten this far
http://www.howardforums.com/showthread.php?t=1152710&page=1&pp=15
I'm a bit afraid to go on without instructions
Here is the lcd I got
http://cnn.cn/shop/8525tytn-touch-p-87.html
hi
i have a htc touch plus or as they call it htc touch dual.digitizer issue it stoped responding so i bought new one fitted in and still the same problem .i think is a software problem i guess driver software for touch screen .if any one can help please
thanks
Touch Dual digitizer
Hi Saliml2
Not convinced it is a software issue. My digitizer on T-Mobile Touch Plus did the same thing. It stated behaving erratically and then stopped responding altogether. I replaced the digitizer (via eBay) and it work for a few days and then stopped again.
I have read around the internet and have tried several ROM updates etc (currently running a WM 6.5.5 found in other area of this forum) but this has not solved the problem.
It seem to be an alignment issue - i.e. screen alignment is outside the screen area, but there seems to be no way of getting it back. Could be a fault on the phone mainboard (?) but there doesn't seem to be any info around apart from sending it to HTC for repair (not viable as the phone value negates this)
My phone is still not working, I might try opening it up again and reseating the digitizer cable but have done this twice already.
Have you try change the flex cable?
I had one to, with the same problem, and after changing the flex everything was ok...
Good luck!
Hi Amokh Just to clarify, what is the flex cable? The digitizer has a cable already attached to it that plugs in to a zif connector on the mainboard - I assume that this controls the data flow for the digitizer.
Any help would be appreciated.
deepthought2471 said:
Hi Amokh Just to clarify, what is the flex cable? The digitizer has a cable already attached to it that plugs in to a zif connector on the mainboard - I assume that this controls the data flow for the digitizer.
Any help would be appreciated.
Click to expand...
Click to collapse
Maybe this is helpfull http://www.pdacenter.ru/razborka/razbor_htc_touch_dual/
Goodluck
Flex cable, i was mean the cable between the mainboard and the lcd block, you can see it in the previous link, picture 20. Have you try it to change?
hello guys how did you manage to put the digitizer cable in place mine doesn t seem to get in place do i need something to hold the connector in place???
i have 2 X10s, one with a broken usb, and one with a broken circuit somewhere that controls the display (no screen using tested working screens).
what i'd like to know.
A is there any known way to cut off the USB part of the PCB and jumper it to another board?
B does anyone know of a fix to a the broken display problem ive described (countless googling found nothing)
C is there a way to exchange the chip holding all the BB and firmware data after flashing with the board with no display?
Hi
I'm hoping someone can help me. I have an Archos 80 G9 given to me as it wasnt charging, the connector had come off the board but I have re soldered it back and now charges fine.
However whilst I had the tablet was apart the touch screen no longer works, (whether a connector is broke or not I am unsure.) I am hoping someone has a picture of how the inside is supposed to look like or take a picture then I can begin the process of elimination.
Many Thanks
Hi,
I had a similar problem with an Archos, it turned out the screen just needed to be configured again
Hold power and volume up on boot till the white screen
Repair system
Force touch screen calibration
---------------
If this doesn't work check your connection on the two ribbons connected to te motherboard that is the only two connectors from screen to the board, the other two white and black wires are power and signal for wireless.
Good luck
Hello! My tablet not boot.
Once in the browser, the screen flashed white and the tablet was able to bootloop. After the logo 'Archos' screen flashes white color and tablet restarts. This occurs in cycles. Term of warranty repair expired. I can go into recovery mode and even download different firmware, but the result is the same - bootloop. I figured that the problem is in the motherboard. i'm found a donor (ARCHOS 80 G9 Turbo) and did transplant motherboard from him. My motherboard revision V2.5 (109376V25), the motherboard donor V2.4 (109376V24). The tablet can boot, but the touch control is not working. The implementation of touch controls on my plate, and the donor is visually different, but I think the functionality has not changed
Please tell me whether there is a difference in the versions of the touch control for different motherboard revision? Or is it my touch control failed ?
My touch control:
http://forum.xda-developers.com/attachment.php?attachmentid=3331847&stc=1&d=1432613829
Donor touch control:
http://forum.xda-developers.com/attachment.php?attachmentid=3331846&stc=1&d=1432613829
Yep, this tablet has different touch screen digitizer chips in different editions of the same model. Try to buy USB OTG cable and turn on Android USB debug in settings using mouse. Then connect your tablet using USB cable (from charger) to your PC. Install android tools and run "adb devices", if your device is there, than run "adb shell". Then you can try to exec "lsmod" there to see which modules are running. You'll find out there your "old" touch screen digitizer driver. Then you can take a look at available touch screen drivers of this model "ls /lib/modules/". You can try to remove old one and load new one (rmmod/insmod) but I haven't tried it yet. I have the same touch screen problem, and haven't tried to root my device yet to check this thing out.
P.S. It looks like you had TR16C0 and Tango F48 chips in your old cover of tablet. And the new one is probably cypress_tma340, but your picture is bad to recognize. Also, touch screen boards are on different plate or cover of tablet with its motherboard. They are connected with ribbon cables to Archos motherboard. Also, have you tried to recalibrate touch screen in Engineer menu (Power button + volume + on start -> Repair -> ...)? If your volume button doesn't work than it means that touch screen cable connection is bad.
Hey, I found the solution to the problem of different touch screen digitizer. Take a look at this file:
adb pull /mnt/rawfs/tags tags.bin
And then give me your tags.bin. Also see this file:
https://github.com/archos-sa/archos...6f53/arch/arm/include/asm/feature_list.h#L224
and this file too:
https://github.com/archos-sa/archos...arch/arm/mach-omap2/board-archos-a80s.c#L1558
Also read this topic on FTAGs.
http://forum.xda-developers.com/showthread.php?t=1711864
Ask if you need any help.
Hi, this problem is solved.
During boot various parameters are initialized, including touchscreen model, namely checks in the service area of the presence of the tag memory "feature_tag_touchscreen" (if (! Tsp || (tsp-> vendor == 0))), if the tag is not found or vendor = 0, then the driver is used for touchscreen "cypress_tma340", otherwise the driver "tr16c0_tsp". My own motherboard was tied to the touchscreen "tr16c0_tsp". Donors motherboard was tied to "cypress_tma340". Because of this, my own touchscreen does not work on the donor's motherboard. In the service area of a memory of donor's mother board had to add the tag "feature_tag_touchscreen" with own touchscreen (tag structure described in "feature_list.h"), to select a correct driver. After reboot touchscreen started working !
I understand that the motherboard has to be tied to their controllers and memory chips, but do not understand why "Archos" did bind to the touch screen, because it is not a component of the motherboard and can be replaced. This greatly complicates the process of replacing. Those who replace the screens and touch panels must know about this.
Thanks to everyone who tried to help and who helped me !