Has anyone attempted diagnosis and or repair of a faulty oem keyboard?
In particular units that don't turn on or don't charge? Any ideas, leads or others with similar issues?
Related
Hi friends
I am having an handset(Tilt) with flex cable problem, but wondering if flex cable can solve my phones problem where it is doing the following:
-Not accepting the SIM.
-phone is getting hanged any times, speed is also very pathetic.
-keypad is pressed on its own.
-Phone is not accepting any charger but charging with PC USB.
These are some of the major problems, I wish if someone could help me out in knowing what work does a flex cable plays, coz the technician is charging so much to change the flex cable & giving me no assurance as to what problems will be solved. I would like to know from some of those technicians here who knows something about hardware. Mike I am talking about you specially.
I would like to write this in our XDA encyclopedia given the case I get proper knowledge about it.
Looking forward to answers.
This is quite difficult to answer without testing. The SIM not being recognised will in itself slow down the phone or even create a full blown crash.
It's not stated what flex cable we are talking about. Flex Cables are just multi wire connections between circuit boards. Phones often have 3, 4 or more flex cables. For example between the the physical keypad and the motherboard or the d-pad and the LCD screen or between screen and motherboard etc etc.
It IS possible a flex cable can get damaged. This normally happens in phones with a slide out keyboard where the flex-cable has to roll back and forth as the keyboard slides in and out. However, such a cable would not I think change the charging behaviour of the phone.
It charges on PC connection but not charger connection. To me that normally indicates a USB port connection problem - bent pin in the slot, possibly even crossed pins or a cracked or dry solder joint between the usb port and the motherboard.
Another thing to consider is whether all the battery contacts are making good contact with the phone. Here again the multiple connections between battery and motherboard can become dry or cracked leading to erratic or underpowered connections.
The keypad being pressed on it's own can again be caused by different things:
1
It could be a faulty or loosley connected flex cable
2
Pressure being put on the digitizer screen by something under the bezel or just a damaged digitizer layer
3
A key that is not releasing from the keyboard properly (is it always the same key or group of keys?)
4
Moisture at many different places inside the phone, including keyboard, d-pad etc. Even when dried out, the residue or oxidisation can continue to cause problems.
So, I would not rule out a flex-cable problem, but it might not be the only fault. Unfortunately then, the technician you spoke to may be correct and it is not possible to guarantee it will solve all problems. Having said that, I would want to say to the technician that I am not going to pay for a new flex if it does not solve any of the problems.
This is where it becomes difficult to decide whether to go for paid for repair or to attempt the job yourself.
Mike
Here is my case, I am now on stock 4.1.1
When I connect my nexus to my PC, it only charges. I can neither mount USB storage nor attaching to debug mode. What even worse is that, I can't even run fastboot command in bootloader, so basically I can't flash a custom recovery.
As a result, I am now stuck on stock ROM.
Can anyone please give me an idea to get my USB driver work, or at least to flash a recovery?
EDIT: I have used fast charge before, so will it screwed up or disable the USB driver? Any way to restore it in my case?
EDIT: Solved. The two USB line charges only
Can anyone help me?
I have tried two USB lines with two PCs, so I do think there is a problem of my phone.
barrielui said:
EDIT: I have used fast charge before, so will it screwed up or disable the USB driver? Any way to restore it in my case?
EDIT: Solved. The two USB line charges only
Click to expand...
Click to collapse
Hello barrielui,
would you describe more information how you solved that issue? What do you exactly mean by last line? It's working only for "charging" or for data transfer (mass_storage) too? You've found new type of USB cabel or what?
Unfortunately have the exactly same issue few days after upgrade to JLB 4.1.1 stock Rom. It works properly few days and than from some reason something happen, but don't know what&why and how to fix it.
Think maybe it's a hardware problem, but how it happened is mystery
I had issues with my usb for a while myself, it just kept getting worse until I would not get a charge at all. Your issue may be different than mine, but I had my nexus s the first week it came out. I had already planned to have my phone sent in for repair on my usb, so I figured I could tinker with it. It turns out that the little tab in my charge port was pushed down (away from the screen when holding in hand) just enough that it would barely make contact with my micro usb cables. I used a tac and slipped it in between and carefully pried up a little.
Caution, this may not be your problem, look at other options, or compare your usb port to another phone to determine if it is it. My tab was just barely gaped from the bottom.
Solution
Try cleaning the Nexus port pins with something pointy...deposits on pins inside cellphone port prevents the usb contact..clean it one by one with a pin and tell me if it worked
teekex said:
Think maybe it's a hardware problem, but how it happened is mystery
Click to expand...
Click to collapse
It was a hardware issue with USB connector on motherboard on my case, but strange is that it was occurred when flashing to newer system.
Hi folks,
The USB port on my phone has always been flaky, and now it's decided to give up completely. When I plug my phone into my USB cable connected to my PC, it keeps not recognizing and subsequently resetting the device. This is not a software issue, and it's certainly not the qhsusb_dload USB brick variety that plagues other phones, it's just a simple hardware problem with the USB port on my phone. I was wondering, does anyone have any suggestions that may help fix this, without taking the phone apart (I would certainly break something if I had to open the thing up)? Presumably the USB connectors are just blocked by dust, but I don't think it would be wise to try to suck it out using a vacuum cleaner (I'd probably gut part of the phone). Any tips?
I'm pretty sure this is going to be a hardware problem, but I wanted to see if anyone has experienced anything similar. Yesterday, without any reason, the keyboard on my dock stopped working. The touchpad, USB port, card reader, and charging port all still work, but nothing is coming from the keyboard. Even the caps lock key is not lighting up when I press it. I'm hoping I can crack it open and it'll be a simple repair, but I wanted to know if anyone else had experienced this.
Ribbon Cable
I solved my own problem. I don't have a star driver with me (on the road for work), so I didn't think I would be able to open the dock until I got home. However, I found I was able to open the top edge sufficiently to see that the ribbon cable from the keyboard was completely detached. The retainer was locked, so I'm wondering if it came like that from the factory and just finally came loose after two years.
Hi! My mother's S7 is not recognized by any PC right now. Before I order a new USB PCB I'd like to ask for some help here. The symptoms are:
- Charge and fast charge fully working
- Everything inside the phone is workin, not a single scratch
- When I plug in to any PC, no data mode transfer appears, neither under quick settings, just charging.
- Windows doesnt recognize anything when the phone plugged in, seen on device manager.
Did you install the Samsung USB drivers?
9 times out of 10 it is the USB port. This can be replaced by dismantling the phone and connection a new USB ribbon.
If you have tried this and ruled out the port, I had one where a dodgy charger had fried some components between the USB ribbon connector and the multiplexer IC. I had to replace components ZD8008, ZD8008, R8019 and R8020. These serve as input protection on the USB data lines.
Someone with microsoldering repair experience will be able to replace these for you. You be no more than 75 Euro. It does involve dismantling so may void warranty/water resistance.
BossHogg12 said:
I had a similar problem - turned out a dodgy charger had fried some components between the USB ribbon connector and the multiplexer IC. I had to replace components ZD8008, ZD8008, R8019 and R8020. These serve as input protection on the USB data lines.
Someone with microsoldering repair experience will be able to replace these for you. You be no more than 75 Euro. It does involve dismantling so may void warranty/water resistance.
Click to expand...
Click to collapse
I guessed so. Where can I find this components? Are they smds resistors, capacitors? I know microsoldering but does it deserve the effort? I mean, can I found a USB pcb replacement and just replace the whole piece?
Thank you very much!
EDIT: Like this one
EDIT2: I missunderstood your first line...I haven't already tried to replace the usb pcb. I think I'll try and if it doesn't work, well... I hope not -.-"
I draughted this reply before I saw your edit; sounds like you know what to do though: :good:
Sorry, it never occurred to me that you hadn't tried a new USB port flex yet. 9 times out of 10 it is that. Get one to try; fitting it is a pain because you have to separate the screen from the mid frame for the back/app button backlights but you can test it without removing the old one. They are very cheap and available on eBay etc.
If the new USB doesn't help, the fix is probably the microsolder repair I described above. Those components are in the main PCB so a USB daughterboard swap won't help.
BossHogg12 said:
I draughted this reply before I saw your edit; sounds like you know what to do though: :good:
Sorry, it never occurred to me that you hadn't tried a new USB port flex yet. 9 times out of 10 it is that. Get one to try; fitting it is a pain because you have to separate the screen from the mid frame for the back/app button backlights but you can test it without removing the old one. They are very cheap and available on eBay etc.
If the new USB doesn't help, the fix is probably the microsolder repair I described above. Those components are in the main PCB so a USB daughterboard swap won't help.
Click to expand...
Click to collapse
Yeah, I'll do so. Or I just sell it like that, what comes first hahaha
Thanks!