If anyone can offer any advise/assistance, it would be greatly appreciated!!
I have 2 AT&T branded 8525 phones. Both have issues and I assumed I could make one good working phone from them.
Phone 1 had a touchscreen issue. It is not responsive what-so-ever. I tried the credit card trick, cleaning out the edges, hard reset, soft reset, etc... nothing seems to make it respond at all. Reflashed the ROM, but of course I am stuck at the "Touch Screen to Begin" screen.
Phone 2 works just fine, but when plugging in the mini usb charger the screen starts to fade to white (with many vertical lines appearing...but eventually the screen goes to white). If you wiggle the charger, it will clear up, but then go back to the fading white screen. If you leave it long enough on the white screen, it will lock up.
So I thought I could take the known good LCD from phone 2 and put it in phone 1. Yesterday I took both phones apart to do this. I placed the good LCD in the phone that had the possibly bad LCD. Put it all back together and found the touchscreen still does not work . So perhaps the LCD was fine and it was something else. I then decided to just take the motherboard from phone 2 and put it in phone 1 along with the LCD I just replaced (effictively moving the lcd and motherboard over to a new case). Same issue... touchscreen does not work. I assume moving the parts around eliminates a loose connection of some sort. I did make sure the ribbon cables were properly aligned and secured well. I am guessing something is wrong on the motherboard.
Does anyone have an idea of what could be wrong to prevent the touchscreen from working?
Oh...moving both the motherboard and lcd with the whitescreen issue(phone 2) over to the other phone (phone 1) casing didn't change anything at all either...so I assume that is not a connection issue with the cables. I also looked closely at the mini USB connector on the motherboard to see if there was bad solder or something that was making it act up. I am guessing bad hardware in both phones, but was hoping I could somehow make one of these phones work and junk the other. Sounds like I may have to junk both as the cost of parts is probably is silly.
Thanks for any help!!
Eric
Hi, I come on here quite a lot for information as it's an amazing resource! This time however, I'm attempting to give something back!
I experienced the "black screen on slide out" on Monday. Phone completely screwed. I've also had a few droppages and had it apart once before so there's no way warranty is gonna help!
I stripped it down and soon discovered what it is that actually fails on the ribbon. The coating had worn through due to rubbing on something during the slide out / in process. it had been playing up for a while, probably due to shorting out on the metal case, but now the tracks (aluminium?) had worn right down.....
In pic 1 i've circled the worn area. The shiny section is where i'd tried taping over it to prevent shorting, before i realised the tracks were gone.
Got an almost new one off ebay for 15 quid and, realising it was going to happen again, came up with a solution that, so far, looks like it will work....
A while back I bought some "anti rattle felt" for my car's dashboard - really thin and strong self adhesive felt to prevent squeaking joins between dash sections. I cut a piece of this and stuck it to the new ribbon. Once this stuff is on it's well stuck, by the way!
See pic 2 for the modded ribbon cable.
On reassembly everything is working just fine so far! Here's hoping that it lasts longer than 6 months this time!
Just need a new casing now as mine is decidedly second hand!
Hope this turns out to be of use to someone!
cool story bro
when i took apart my xperia to replace the housing this seemed like a really weak point in the device. glad to see someone who has had the problem has been able to fix it
Why does the screen go black?
Hi,
When the coating wears off the ribbon cable it exposes the tracks in it. when you slide the keyboard out the exposed tracks short out on the metal casing and the screen loses it's input signal.
thats whats happened on mine at least and i presume quite a few others?
HTH!
Update:
That's interesting: My phone was also losing signal with the keyboard out, and occasionally while closed up as well. It would just randomly drop to "no signal" for a few seconds.
It hasn't done it since replacing the ribbon cable.....could be coincidental of course.
I'm having the same problem
It just started a week ago and I got the phone in January off of ebay. I'm new to opening up the phone so could anyone help me find the correct tools or have a link to a site with pictured instructions?
I noticed that the sliding mechanism started to go loose about 4-5 months ago but didn't expect the screen not respond in landscape mode. I have yet to see the other symptoms you all are referring to. I would like to fix this before it get worse.
In mine case it went totaly black after one week of this problem... You have all the instruction on youtube, there is where i looked. For tools you can be inovative, but the exactly right ones come with housings from ebay, it is only 15EUR, and i bet you have some cracks so it wouldn't hurt replacing. That is what i did, along with ordering new sliding mechanizm, and new ribbon cable.
I am open for ideas to prevent my ribbon cable from being cut at it weakest point again.
I'm assuming my flex ribbon went bad yesterday, since sliding the keypad out causes my screen to shut off.
Already ordered a cable off ebay and will attempt to replace it myself :O
Replaced my flex ribbon cable with one I bought on eBay. The screen doesn't turn on at all now, which leads me to believe the cable I was sent is defective. Put the old one back in and it works okay, less landscape mode. ughhh what a pain.
great tips! my input is I bought a case off of ebay that was ~60$ and everything actually fit fine for me...so I wouldn't discount every seller but you do get what you pay for, the 15$ cases are probablly the ones that will give you problems
I working in a mobilephone repair center if anyone need help drop me a priv... i able to get 2nd hand or even brand new components
Replaced the flex ribbon cable -
I got my flex ribbon cable a few weeks ago and took it to my local repair shop. They replaced it but the LCD screen/optical joystick receives no power. The touchscreen and everything else on the phone works just fine now. I thought it was a defective item so it was exchanged with a new one.
Got the repair shop to replace it again and the outcome still remains the same as the first.
Theres no light coming from the screen nor the side illumination.
I just told the repair shop to just place the original back in for the mean time.
Before the repairs, there would be a flicker of white light and random illuminations. Now there's no lights at all except the power botton.
Could it be defective a batch that the seller was sending out? or the repair shop's mistake and is playing dumb so they do not have to admint fault?
Hopefully there's an easy fix to this problem.
-Also I did inspect the ribbon before and after the repair. looks new as the OEm
Can anybody help me out with this new problem after replacing the cable -
perhaps you should try a hard reset. Ive had problems in the past where the optical joystick and the illuminators did not work, and that worked for me.
On the other hand, the top illuminators are on the same piece of hardware as the flex cable that was replaced, so a faulty flex cable is possible. The bottom illuminators are on the circuit board that the optical joystick attaches to, separate but connected to the flex cable.
Ive recently replaced my flex cable and touchscreen. The experience i had with the faulty touch screen was that it appeared to receive no power, but was in fact displaying a dark backlit illumination that could only be seen in the dark. At the same time however, the screen did not display anything. I'm not sure if this is similar to your experience, but if so then your touchscreen would need to be replaced.
ive done all repairs on the xperia myself, and one thing ive discovered is if something doesnt work right after a repair, simply disassembling it and reassembling it to make sure all the connections are properly done has worked for me in the past.
"Before the repairs, there would be a flicker of white light and random illuminations. Now there's no lights at all except the power button."
Now when you say the power button, do you mean that a red light appears under it?
I dont know if i can come to a conclusion or that i can help (or have helped) you come to a conclusion, but i can only assure you that the xperia acts out in strange and weird ways.
Good Luck!
Tags
Dismantle / Disassemble Sony Ericson Xperia X1
http://www.ifixit.com/Teardown/Sony-Ericsson-XPERIA-X1/788/1
http://www.formymobile.co.uk/xperiadisassembly.php
http://www.youtube.com/watch?v=AWDurQrRt-Y (REAR)
http://www.youtube.com/watch?v=iyGUbxFqvyc&feature=related (FRONT)
http://www.youtube.com/watch?v=elgC8hwHfYQ&feature=related
For info.
Mike
Thanks for the links. I've tried the hardreset and restoring the original rom but the issue is still there. It's really bugging me that everything works but the LCD screen. I'm currently using MyMobiler to use my phone. The touch screen works fine and so does the soft keys. Just no power for the lights. I might just give up and wait for another phone that catches my eye and then tinker with the xperia myself. but if anyone got a solution or want me to test something then I'll give it a try.
My warranty is no longer affective so I'll use my phone as a tester to help others with any problems.
TRIONDAVE, how's your Xperia running now with the cable mod that you did? Its been 6 months since you created the thread. I hope you're still around.
My Xperia X1 works nearly fine, except for the keyboard issues, so I'm thinking of opening it up. If your Ribbon mod helped I might just do it too once I've got it opened. Mine has a MOUNTain of cracks though, and the battery compartment itself is cracked on both side enough to make the compartment CURVED. Hence the Battery cover doesn't sit well.
I'm looking around for broken Xperias which I might be able to use to change the internal cracked casing. Lets see.
DatDereX1 said:
cool story bro
Click to expand...
Click to collapse
My thoughts exactly.
Hello guys, I am in need of real help over here!
Its just that Ive replaced my ribbon cable, the old one got screwd up.
However I got done for 10 minutes ago, tried to start up the phone.. without success :,(
The ribbon cable doesnt have anything to do with the start up, only the screen am I correct? Cause I cannot even start my phone..
Ive connected the charger, but when I remove the battery it shows a red light, meaning no battery, correct?
So what may the problem be exactly? Maybe the battery is all dead, or?
PLEASE HELP!
for the people with ribbon failures how long have you had the phone before it occurred ? im just interested on the cables lifespan.
mine is fine so far but i have noticed the slider is flimsy and rocks left and right.
For weeks, hell months now I have been reading through threads about HD2's not responding to touch. I had just about every sympton everyone else had.
-touch would work then not
-soft reset would fix problem
-reload to OEM specs, temp fix
Finally like most, my phone stopped responding to touch too. Must be the digitizer. So I aquired another HD2 and went about my life. Some months later I aquired a third HD2 with a bad charging port. Everything else worked fine. So I took the main board out of the one I orginally had with the bad digitizer and swapped it with the one having the bad charging port. Guess what...the touch doesn't work after the swap. So I swapped back and it worked!!!!!
I then took the original LCD and Digitizer which I though was bad, hooked it up to the mainboard with the bad charge port and volia!!! Digitizer works. I left it like that a few days and it worked fine. I have and induction charging system for the phone so I used that to charge while I performed my tests.
I did lots more swapping and testing and my final result is the main board from my original phone is the culprit of the digitizer not working. Digitizer from both phones always works when hooked to the mainboard with the bad charge port and never works with the orginal mainboard.
After all the threads I read through I haven't seen anyone else with the mainboard being the problem/solution to the digitizer not responding so I though I would share. Keep in mind, even though the digitizer didn't respond with the bad mainboard, all other functions worked. The hard buttons responded, I could answer phone calls with them. I could communicate with the phone via USB, etc.
Joe
My usb port has been flaky for a while but finally gave out totally recently. It's actually loose inside the case. Over the past couple weeks my digitizer has also been going bad. I read about how you can press the power button hard to get it working again, which works but it seems only a matter of time for that thing too. Anyone got any recommendations for what I could do? I ordered an external battery charger and battery but all it accomplished was frying my old battery. :/ I might try to solder a new usb port on once I have good reason to (read: solid mango wp7 rom.) but if my digitizer is done it's not really worth it. Why would pressing on the power button revive it when it's not working? I'm hoping it's just a loose cable.
Bottom line, does anyone who's had these problems (they're the two most common HD2 hardware issues afaik) have any recommendations for solutions?
Your USB port issue probably can't be fixed.. unless you can find someone who is willing to help you solder a new usb port to your motherboard (or you can do it yourself if you have enough skills)
As for your Digitizer, you can open up your hd2, and check if the digitizer plug is loose (located under the lcd). If it isn't, that means your hd2 digitizer is dead, and you should order a replacement.. (of course, please see here
I have the same issue with my Infuse. The digitiser only seems to have a problem for the four bottom buttons. They have a mind of their own. The rest of the screen is fine. My USB port is intermittant. I'll probably just take it back to the store though. Sorry I cannot help.
Hi
I have an issue with my small redmi 4a.
Some times ago the phone felt down and the lcd broke and the backight started to stay always on if screen is off.
So I decided to change the lcd and I bought one with the whole frame.
Now the lcd glass is perfect, but I still get the backlight always on when screen is off, so it seems something in the boards or in the connections between board and the lcd.
What can I check more?
Thanks
Try a hard reset.
Make sure no ribbon cable micro connector contacts were damaged during the repair. That all grounds and connectors are connected. Sometimes these connections are made by direct physical contact between subassemblies; eyeball it carefully for contact pads.
Check the mobo very carefully for damage or debris. A PC trace or component solder joint maybe broken or less likely shorted by debris.
If it's a trace or surface mount solder jiont it may be very hard to find if at all.
IDing where the backlight driver is/where it gets its high/low signal from the mobo would help you narrow down the area hopefully.
It's also possible the backlight driver control circuit was blown.
Thanks for the reply @blackhawk
The issue was there previously to my repair, so probably happened when the phone felt down and the screen broke.
There are two boards, one in the upper side and one in the bottom side of the phone.
Do you think there is something wrong in the main (upper) board or the bottom one?
Just to concentrate on one...
Thanks again!
Really strange...
It seems not to be an hw issue.
I jest flashed, with Miflash, MIUI 9.2 Global and now the backlight does not show anymore.
Previously I was on Resurrection Remix (8.6.4) Android 10 and tried also the Android 9 version....
So I decided to try again to install RR with Android 10 and now all works fine.
Probably the MIUI installation via MiFlash repair something went wrong previously...
Excellent!
That's hella better than trying to track down a PCB issue.
Didn't know your were mucking with the firmware, lol the usual suspect
Put a good case on the puppy if you can... as you see now how convoluted it can get.