Develop Bugs

[Q] LCD Flex Cable Connector Port Broken

Hello, I saw that someone else asked a similiar question before but they did not word the question correctly and got little help.
On my HTC EVO logic board, there's three tan "ports" (I don't know what they are actually called). One for the front camera, one for the LCD, and one for the front panel.
While walking home one day, my screen started showing a dark spot. The spot got bigger, and I decided to take apart my phone (something I'd done before a few times) and try to clean things up. I put everything back together, and the LCD would not come on. After numerous tries, I finally decided the LCD was damaged. As I went back in the phone, I saw that regardless of whether you flipped the black tab on top of the LCD tan 'port' back or forward, the cable was capable of being pulled out, e.g., it was not secure. At the time, I thought nothing of it, but now that my new LCD should be here, I'm worried.
Is my LCD not working because the 'port' is broken? If so, what can I do to repair it? (I heard it is very difficult). I'm worried, because I paid a lot to buy a new LCD and will be unable to send it back.
http://guide-images.ifixit.net/igi/ZYHLZwIIVhjilEpT.large
Also, my front panel cable never sits 'perfectly'..that is, I have to connect everything else first, and then try my best with the front panel. The tape does not stay down flat completely.

These sorts of connectors can be fixed,but there is quite a bit of skill involved. Upload a picture and I can tell you better how hard it is. What I can tell you is that you probably cant do it yourself. I base this on the fact that those who have the necesesary skils will instantly know its going to be a pain. In fact,its easy to screw it up ,and sometimes you do,even if you DO know what your doing. Since I dont want to take my phone apart,Ill need to see a picture of it before I can tell you anything more. One thing to keep in mind is that sometimes the ribbon cable CAN be pulled out anyway,and is making good contact and there is some other problem. If you have not installed the new LCD,install it and see if it all works. If so,your good to go. As a general rule,the connectors are delicate and its not a good idea to pull them out. In fact,dont disconnect them if you dont have to. They have a limited number of connect/disconects they can take and they are very easy to break.

pflatlyne said:
These sorts of connectors can be fixed,but there is quite a bit of skill involved. Upload a picture and I can tell you better how hard it is. What I can tell you is that you probably cant do it yourself. I base this on the fact that those who have the necesesary skils will instantly know its going to be a pain. In fact,its easy to screw it up ,and sometimes you do,even if you DO know what your doing. Since I dont want to take my phone apart,Ill need to see a picture of it before I can tell you anything more. One thing to keep in mind is that sometimes the ribbon cable CAN be pulled out anyway,and is making good contact and there is some other problem. If you have not installed the new LCD,install it and see if it all works. If so,your good to go. As a general rule,the connectors are delicate and its not a good idea to pull them out. In fact,dont disconnect them if you dont have to. They have a limited number of connect/disconects they can take and they are very easy to break.
Click to expand...
Click to collapse
Well, I don't really have a means of taking a quality photo except with my computer webcam but I'll try in a second. I can't really show you because there isn't much to see. The little black bar that flips up and down to 'lock' the port is ineffective; the cable can be pulled out regardless. I know I can't fix the port/connector by myself, so I'm hoping that's not the issue. You have given me a lot of hope though. The new LCD should be here by Wednesday at the latest, so I'll be able to test it then.
Does my front panel affect the LCD? Since I dropped my phone on the corner, even with a new panel it does not sit 'perfectly'. I don't think they're related though.

BluRngerGurl said:
Well, I don't really have a means of taking a quality photo except with my computer webcam but I'll try in a second. I can't really show you because there isn't much to see. The little black bar that flips up and down to 'lock' the port is ineffective; the cable can be pulled out regardless. I know I can't fix the port/connector by myself, so I'm hoping that's not the issue. You have given me a lot of hope though. The new LCD should be here by Wednesday at the latest, so I'll be able to test it then.
Does my front panel affect the LCD? Since I dropped my phone on the corner, even with a new panel it does not sit 'perfectly'. I don't think they're related though.
Click to expand...
Click to collapse
I dont think so. I bet your ok. Just dont keep playing with the connector. I know,Ive done it. I sit there messing with it,wondering,is it broken? Is it good? Then the little black peice comes off in your hand or the plastic breaks and "well its sure broken now!" Remember,that little latch does not so much hold the cable in place as hold the cable against the contacts,if its making contact,its good to go.

Hi, all. The new LCD I receieved did not work. There are very minor differences in the two; such as some type of blue gunk on the silver part of the LCD, the connector is more of a dark orange on the new one while the original is a yellow-orange, etc. Also, again, the connector does not 100% fit in the slot. It goes in, but a small corner sticks out a bit and you have to either hold it in or clip it in [which I can't, because the black clip is broken].
The only possibilities I can think of are
A] Because the little black thing is damaged, no LCD will work in it. Therefore I need a new phone.
B] The LCD does not work.
C] The LCD is the wrong size.
At this point I want to just give up and get a new phone, which is very heart-wrenching because I love my EVO and I doubt I can afford the only other phone I like, the Samsung Galaxy S II Epic Touch 4G.

Is anyone able to identify what connector is used on this phone for the LCD? I broke a pin on the connector while trying to repair a cracked screen. I would like to buy it and re-solder it on to fix the phone.
Can someone link the correct connector maybe from digikey.com?

Broken latch
I too have a problem with the connector... the plastic part that connects the ribbon cable to the main board has broken. There must be a place to buy these tiny plastic latches... does anyone know? Your assistance will be greatly appreciated!
Mac-

[Q] Please help! Strange problem with my HOX

Yesterday i dropped my device from one feet. It turned off and i turned it on.
Now lower part of screen and capacitative buttons dont work. i will attach a image(non-working area outlined in red)
My warranty has expired so i cant exchange it for a new one. What should i do? Can i fix it by myself?
Please help me

Fycola123 said:
Yesterday i dropped my device from one feet. It turned off and i turned it on.
Now lower part of screen and capacitative buttons dont work. i will attach a image(non-working area outlined in red)
My warranty has expired so i cant exchange it for a new one. What should i do? Can i fix it by myself?
Please help me
Click to expand...
Click to collapse
Hi,
Only thing I can think of is that somehow it has damaged the cable from the touchscreen or the tiny wires that feed into the cable without damaging the screen. I came across a brand new screen I was replacing once for someone that had a similar problem where the bottom left hand corner wouldn't respond to touch unless there was firm pressure on the screen to create contact, and this was a brand new screen. It could also be that the touchscreen connector needs to be pushed back onto the board if it's come a bit loose.
If this is the problem, you can fix it by yourself although I'd have a good look around youtube, there are heaps of DIY videos of how to replace screens. If you do go down this path I recommend you replace the touchscreen/LCD/LCD frame in one go, as it's generally already pre- assembled the only thing here is that there are 3 brands of LCD's HTC used with the phone and they aren't all compatible, and you can only tell by pulling down your phone and looking at the LCD flex cable colours, and the other thing is that the screens that are available aren't always the same quality as the original. If this sounds to hard your best bet is to take it somewhere and diagnose the problem just in case it's something else

Which replacement screen (Sharp, sony acer)

ok so... the store broke my lcd while they were trying to remove the digitizer... and now i am looking at ebay on which lcd+touch assemlby to buy and i have a question. are the sony, acer and sharp lcd versions compatible with all one x mobos? i did some research and found that the sony version is the best (so they say)

and313 said:
ok so... the store broke my lcd while they were trying to remove the digitizer... and now i am looking at ebay on which lcd+touch assemlby to buy and i have a question. are the sony, acer and sharp lcd versions compatible with all one x mobos? i did some research and found that the sony version is the best (so they say)
Click to expand...
Click to collapse
Hi,
The Sony and Sharp are not compatible with each other( I've tried to replace one with the other), I've never come across the Acer LCD in Australia so I'm not sure. If you don't know how to tell the Sharp and Sony apart, the Sharp has Green backing on the flex cable, while the Sony is sort of orange with a few yellowish stripeson the back of the LCD flex cable. Sorry I couldn't find any of my photos which show the difference. I would recommend buying the LCD/digitizer combo and a separate midframe to mount it on, as it comes with new 3M adhesive, but you may also have to add a few TINY drops of instant adhesive, I say tiny as too much will press out under the digitizer and will show up, but I have found that without it the digitizer will lift from the frame eventually due to the tight fit of the frame in the rear shell of the HOX.
Hope you go ok!
---------- Post added at 06:45 PM ---------- Previous post was at 06:41 PM ----------
Sorry, just a bit of additional info, have also come across posts saying the colours of the LCD look washed out with the wrong LCD.

okhughes said:
Hi,
The Sony and Sharp are not compatible with each other( I've tried to replace one with the other), I've never come across the Acer LCD in Australia so I'm not sure. If you don't know how to tell the Sharp and Sony apart, the Sharp has Green backing on the flex cable, while the Sony is sort of orange with a few yellowish stripeson the back of the LCD flex cable. Sorry I couldn't find any of my photos which show the difference. I would recommend buying the LCD/digitizer combo and a separate midframe to mount it on, as it comes with new 3M adhesive, but you may also have to add a few TINY drops of instant adhesive, I say tiny as too much will press out under the digitizer and will show up, but I have found that without it the digitizer will lift from the frame eventually due to the tight fit of the frame in the rear shell of the HOX.
Hope you go ok!
---------- Post added at 06:45 PM ---------- Previous post was at 06:41 PM ----------
Sorry, just a bit of additional info, have also come across posts saying the colours of the LCD look washed out with the wrong LCD.
Click to expand...
Click to collapse
ok tnx for the info... and i was thinking i can just order whatever. i checked the panel_type in the last_kmsg and i found that i have the replacement screen for which nobody knows who makes it. but it is a warm panel so it probably is sony... but i have to rip it apart to be certain
Sent from my One X using Tapatalk

and313 said:
ok tnx for the info... and i was thinking i can just order whatever. i checked the panel_type in the last_kmsg and i found that i have the replacement screen for which nobody knows who makes it. but it is a warm panel so it probably is sony... but i have to rip it apart to be certain
Sent from my One X using Tapatalk
Click to expand...
Click to collapse
That's the only downside - having to pull phone apart to check which one you have. Also another tip, phone need to be on to change LCD's, boot phone up with it apart, then wake up with power button on old screen, then sleep with power button, change screens then wake up again. There are plenty of vids on youtube to help, if new screen doesn't activate, check flex cable is in square and all the way - have had this problem before also.

okhughes said:
That's the only downside - having to pull phone apart to check which one you have. Also another tip, phone need to be on to change LCD's, boot phone up with it apart, then wake up with power button on old screen, then sleep with power button, change screens then wake up again. There are plenty of vids on youtube to help, if new screen doesn't activate, check flex cable is in square and all the way - have had this problem before also.
Click to expand...
Click to collapse
tnx... you answered all i was wondering about really appreciated
edit: ok so i riped it apart again and its a sony. for anyone who is wondering what might happen if the wrong screen is attached to the mobo watch this
https://www.youtube.com/watch?v=DHdtgu4rbxI
and the store said: why you dont just buy the "original" for 40€.... god i hate such people
Sent from my One X using Tapatalk

okhughes said:
That's the only downside - having to pull phone apart to check which one you have. Also another tip, phone need to be on to change LCD's, boot phone up with it apart, then wake up with power button on old screen, then sleep with power button, change screens then wake up again. There are plenty of vids on youtube to help, if new screen doesn't activate, check flex cable is in square and all the way - have had this problem before also.
Click to expand...
Click to collapse
I replaced my screen, but I powered down when removing the screen, and putting the replacement in. Now neither will light up. How do you solve this?

There are no guarantees with this, but try pulling the battery out for a minute or two. then with the original screen in, boot up and let it get to the lock screen wait for the screen to sleep then press power button to wake up then again to sleep. when the screen is sleeping try changing over the screens and then press power button to wake again. this is assuming that the screen displays on startup, but even if it doesn't try this process anyway. if it doesn't work, try doing with the new screen back to the old screen after pulling the battery. I have only ever come across this once, but it wasn't from powering down during a screen change, but pulling the battery seemed to fix it.

okhughes said:
There are no guarantees with this, but try pulling the battery out for a minute or two. then with the original screen in, boot up and let it get to the lock screen wait for the screen to sleep then press power button to wake up then again to sleep. when the screen is sleeping try changing over the screens and then press power button to wake again. this is assuming that the screen displays on startup, but even if it doesn't try this process anyway. if it doesn't work, try doing with the new screen back to the old screen after pulling the battery. I have only ever come across this once, but it wasn't from powering down during a screen change, but pulling the battery seemed to fix it.
Click to expand...
Click to collapse
I tried that, didn't work. I think I know the problem now. after searching on multiple forums, I think it's the 220 coil. A lot of people have had a similar issue, and they say they've solved it by replacing the coil. What I want to know is, how I managed to short the coil in the span of a few minutes, despite having used the same screen as the cracked one.

It is possible to do, although they can go for no reason, I recommend taking it somewhere to get coil replaced, it is a very fiddly job and you need to have a steady hand and the right tools (hot air gun) although my father managed to do one with a standard soldering iron, although it wasn't the best job. you risk damaging other components also if they blow off the mainboard (if you can find them), worst case scenario is the display ic has gone - that one will have to be done by a professional.

what a sh!t phone
we tried to repare it 2 years ago.
but failed.
so i just the pieces to gether wanted to see if i can fix it.
still not lcd just touchscreen (and now im not sure if i even have touchscreen lol maybe i broke that to now not sure
anyway sucks i have a brand new lcd touchscreen with frame we bought back then. and its even the right screen a green flex cable like the original one and still noting so i guess i broke the 220 chip thing how dont know. but not sure if i can replace it sucks it was a good phone
is there any help a easy fix? or do i really need to soldern that chip i cant sell the phone since there is personal data on it contacts and pictures (i guess dont remembrer)

It may still be replaceable, if it's been sitting for 2 headed is the phone taking a charge? It needs to be on to change the screen. If it is charging and booting up, and the screen still won't work when being changed try doing a hard reset by holding the power and volume down button until it restarts - have had advice by someone who repairs phones for a living that this should reset what the phone is looking at for hardware and you should be able to do screen replacement. Failing that chances are it's going to be dead. Not much point in selling it these days as they aren't worth much these days. If the phone won't start the battery may be dead flat. The phone needs some voltage to run its charging firmware, you can try to get it charging by leaving on charge for 10 min or more, even if no charge light, then hold power/vol up/vol down at the same time to recalibrate the charge circuit, it may start to charge after this.
Let me know how it goes, I wouldn't spend too much time on it, unless it's now a project..

okhughes said:
It may still be replaceable, if it's been sitting for 2 headed is the phone taking a charge? It needs to be on to change the screen. If it is charging and booting up, and the screen still won't work when being changed try doing a hard reset by holding the power and volume down button until it restarts - have had advice by someone who repairs phones for a living that this should reset what the phone is looking at for hardware and you should be able to do screen replacement. Failing that chances are it's going to be dead. Not much point in selling it these days as they aren't worth much these days. If the phone won't start the battery may be dead flat. The phone needs some voltage to run its charging firmware, you can try to get it charging by leaving on charge for 10 min or more, even if no charge light, then hold power/vol up/vol down at the same time to recalibrate the charge circuit, it may start to charge after this.
Let me know how it goes, I wouldn't spend too much time on it, unless it's now a project..
Click to expand...
Click to collapse
ow volum down? okay will try that. but i think i killed it lol cause the charging light wont come on anymore lol
it was just a idea that poped up in my head, that maybe i can save it so i friend can use it but i think i will just trow it away lol or something will give it a shot and see. will report back
nvm it's dead it wont even boot lol. i think i burned sometime lol that little cable that onder the battery thats conects the botem part with the other fliped out 2 time and 3time it smeled burned lol nvm

Sounds like it may have shorted, a replacement is fairly cheap , just depends on how serious you are about spending money on it.
I forgot to mention that when calibrating charge circuit with power/vol up/vol down all held down at the same time, they need to be held down for at least 2 minutes.

okhughes said:
Sounds like it may have shorted, a replacement is fairly cheap , just depends on how serious you are about spending money on it.
I forgot to mention that when calibrating charge circuit with power/vol up/vol down all held down at the same time, they need to be held down for at least 2 minutes.
Click to expand...
Click to collapse
nvm i think i fried the cpu or something lol it wont turn on anymore.
i trew it in the bin

Probably the best result, it's probably cheaper to to buy a second hand one and also cause less aggravation when you can't work out why it won't work. You could always sell the replacement screen.

okhughes said:
Probably the best result, it's probably cheaper to to buy a second hand one and also cause less aggravation when you can't work out why it won't work. You could always sell the replacement screen.
Click to expand...
Click to collapse
dont think i will sell it i mean who would buy it? lol but guess i could try for like 20euro or 10 lol.
and have 2 batteries for 10 or 5 euro lol
have 3 backcovers also 2 white and 1 black.
we bought every thing to repaire it but yeah.
could maybe sell some **** but pff dont knopw. (its my oncles old phone will ask him (maybe sell every thing exept de motherboard)

That's what I'd do, try and sell it for parts minus the mainboard. If that doesn't work, put it away somewhere and if you come across a dead one cheap, swap the mainboards out (providing it has the same screen - that's a given). Good luck with whatever you decide to do. :good:

Screen troubles after a tumble

The screen didn't break but after it fell it did look like the bottom left hand corner was visible darker than the rest of the screen. Today, almost a week after the initial tumble I decide to see if restarting it would fix the problem and it did but it lead to bigger problems. Now if the screen turns off for any reason it stays off until I do a hard reset by holding the power button for 10 seconds. When I try and turn it back on the captive buttons light up but nothing else happens. When the screen is on after a hard reset I'm unable to adjust the brightness level when I pull down the top.
How likely is it that the LCD ribbon came loose? It seemed like there were issues with it before.
I'm at a complete loss for what could be wrong with it. Any advice for recommendations would be greatly appreciated.
I'm really hoping I don't need any major repairs or even a new tablet because I can't afford much of anything.

My grandson recently had a tantrum and threw down my tablet. Afterwards the screen was flickering so I decided to restart it to see if that would fix it. The screen never came back on although I could hear it start up sounds and the capacitive buttons would light up. To make the story short, i contacted Samsung and they said it would be a standard $200 repair fee unless they found a loose cable. Today my credit card was charged $59 dollars by Samsung. I guess it was just the loose cable. Note that they sent me a prepaid UPS label to send it back to them and they are shipping it back to me all within that $59 charge. Well worth it for a great tablet.
Sent from my SM-T800 using Tapatalk

You got to remove the back and disconnect the lcd and battery cables and reconnect them after 10 seconds and all should be good. This happened to me after I got the screen of death. I dropped it and the screen did it again. So I just disconnected them both, reconnected, and everything works fine.

bh87771 said:
You got to remove the back and disconnect the lcd and battery cables and reconnect them after 10 seconds and all should be good. This happened to me after I got the screen of death. I dropped it and the screen did it again. So I just disconnected them both, reconnected, and everything works fine.
Click to expand...
Click to collapse
Can you recommend any guides & kits that I can purchase from amazon to help me take the tablet a part?

YouTube it. It is real easy removing the back, patience is needed.

Yes go to youtube for the disassembly videos. I bought a generic repair kit from ifixit for the tools. Though guitar picks can also work well.
Basically when you drop it a cable gets loose. You just have to disconnect and reconnect it.
Mine was very clearly only half connected (not in the picture which is from when I replaced the battery). I also disconnected and reconnected the battery and lcd connectors to make sure. But the loose cable was on the top left and didn't seem to be one of those. Just reseat them all to be sure.
There is another thread on here about disassembly which has pictures that I used as reference.
I've had mine apart twice. Once when I dropped it and once when I replaced the battery for poor battery performance (this really was sooo worth it).

I just received a used Note today and was about to initiate a return because the screen was completely dark but the rest of the tablet seemed to be working, including touch. Removed the back, reseated the ribbon cable, and everything's good now.
Strange start to my experience with this tablet.

Black screen, only backlight works. Everything else is ok.

Hi
Sorry for my english, I'm hungarian, this is the best I can do.
So I bought a cheap (but not too cheap) SM-P905, but I can't get the screen to work properly.
The touch layer, the spen, the backlight works well, I managed to mirror the screen on my pc and everything else seems to be okay.
I got off the back cover, I tried to unplug and reattach every flex cable, even the battery. I tried to look everything under magnifying glass to see what could be the problem.
The lcd flex connector looks like this under my lens.
(Upload it in the next post, not working from the android app)
I tried to clean it with a needle, but it still looks like it is corroded or melted.
Is it possible that replacing this connector will get the screen back to normal? (I found flex connector replacement on the internet)
Or is it possible to repair it with some jumpers or something like this?
Is it melted because of some shorted circuit somewhere else, or because of a bad micro capacitor?
How and where can I locate and resolve this problem (s)? Maybe is it still the lcd that is simply dead and I can't bring it back to life?
I dont want to buy a screen, and a motherboard (neither only one of them )
Thank you for your help!

Okay the forum doesnt let me to insert links or photos, because I'm new here -.-
/s/53oab9sykbihn32/20151021_175009.jpg?dl=0 write dropbox dot com in front of link

https://www.dropbox.com/s/53oab9sykbihn32/20151021_175009.jpg?dl=0
In my opinion it died!!

I hoped for better opinions
I wanted to know how this thing can die?
It has to be caused by something.
Bad resistor/capacitor? Is it on the motherboard or on the lcd's circuitboard?? Or is it only the corroded flex connector??
I dont want to throw the whole tablet in the trash. Everything else is just operating fine.
If nobody can answer this, where should I write, where people can help with these very small components / resoldering / measuring what gone wrong here?

Alan-B said:
In my opinion it died!!
Click to expand...
Click to collapse
So today I measured the pins in worst condition. There are 2 pins that I tought can cause the problem and looks corroded. (Number 5 and 9 from the right) Both of them !are not used!. (There is a total of 3 pins that are not used on the connector/cable)
They are not lead through the flex cable, they have no function here.
So the problem comes from somewhere else, but I still don't know why they look like this.
Maybe I will try to seperate the screen from the body and look at it closer and its connectors/smaller circuit boards.
Sent from my SM-N9005 using XDA Free mobile app

Hmm, that pic does not make me think its a corrosion problem. At best, it can lead to a finicky connection, but there seems to be enough there for proper electrical contact. If this were a headphone jack, for example, I would say apply pressure near the cable to see if the headset works properly, and if it does, then I know its a cable problem. No idea if you can try to apply pressure to the cable and see if the LCD turns on.
If the screen mirrors on the TV successfully, then there are a bunch of Samsung Service Codes you can use to test the LCD. Unfortunately I do not know them for this model, but google should get you the service menu very easily. There is definitely a test in there for the LCD that should give you a better idea what to expect.
If the cable is pretty cheap, I would also just pick up one and try replacing. Nothing to lose! AND if you have access to another identical device, you can try to stick this LCD on that device to see if its the LCD thats the problem or the motherboard.
Lastly, I would want to know if the glass on that LCD has ever been replaced. If they did a glass only replacement, its possible they overheated the LCD ... OR used too much LOCA glue that shorted the connectors.
Many possibilities, so I wouldn't call it a day yet. First, look for the service menu, thats the best place to begin.

I will try the service codes.
Unfortunately I don't have more devices. The easiest way would be to test the identical parts on a working one, but I don't know anyone who would risk his/her tablet for this
The other thing I can do is to get another lcd-glass unit from ebay or from ifixit and try it. If the problem was the lcd, it should work, I'm happy, but if its black, I will have (maybe) 2 working lcd units for sale. Or I have to get a new motherboard (sounds expansive).
I don't think that they replaced the glass on this device, it looks very used and scratchy, so it was working before.
Thank you for taking your time for me and answering my dumb questions!!
Sent from my SM-N9005 using XDA Free mobile app

There are more good news than bad, so I'm very happy.
So 1-2 days ago I started to get off the screen to see if I can seperate the LCD from the receiver. Turned out its not that hard. The only hard thing is to get it off the body in one piece. Lots of heating with a hair drier, and a LOT OF PATIENCE. If you can get it off in one piece you are on your way.
Seperating the glass from the LCD is very easy, did it in 10 minutes, I don't think it needs heating...
So I did it, then I saw some water damage (white things) on the back side of the LCD. There is a small board here too, so I cleaned the white thing off with some alcohol.
Then I put the lcd back and voilá, Its WORKING!!!
The only problem is that I damaged the touch screen glass, so I need to order a new one, but its under 20$ so no problem.
Thank you all for your help, I hope that I finished here
Sent from my SM-N9005 using XDA Free mobile app

Good to know! Thank you for the update

Other solution is remove battery five minute and reconnect battery