Phone won't power on after digitizer change - Galaxy S 4 Q&A, Help & Troubleshooting

Hi,
I tried changing the digitizer on my phone myself. It went fairly smoothly and was working great until it came time to reattach the rear assembly (the part with the speaker on it).
The phone will not boot up while the rear assembly is attached, but when it is not attached it starts normally. If I leave it running and try to attach it the power cuts.
Any suggestions? Seems like it is shorting something out but I really have no idea what.

Related

Screen stopped working, only backlight after trying to fix vibrate

So I tried to do this: http://forum.xda-developers.com/showthread.php?t=376035
My screw was loose indeed. In fact is was so loose it fell out before I had opened it completely.
I tightened the screw, closed the cover, turned it on, and... nothing. Only the backlight of the screen, but the screen stays completely BLACK. Nothing. (I know the phone is working though, because if I hold the off button I'll hear the "boink" sound)
I tried this:
- With and without SIM card.
- With and without tightening the screw.
- With and without the power cord.
Mind you I have NEVER had this problem before.
What is going on here? Did I **** something up badly while opening this phone? If I did I am going to be super sad, so please, help me!
Anyone?
I basically have the same fault mate. My vibrator lock screw was loose and it made the phone rattle.
I opened it up and probably either tightened the screw up too much and killed something on the mainboard or 'pinched' the lcd flex ribbon ( rusty gold coloured thing- it plugs into the small white ribbon connector on the MB ) with the opening tool.
Anyway - the phone could take calls , it seems to be working ,although I have no display , and the keypad buttons are all lit up very brightly , what scuppered me was with the constant case opening I eventually managed to break the power microswitch off the MB and I now have to use the reset button to power the phone on.
I don't want to waste money buying a new lcd screen for a phone which might be terminally damaged due to a mainboard fault , anyone narrow these faults down more ?.
shameless bump.
BUMP !!
Im just fixing my LCD on my P3600 and have it in bits,
is the display connector definitely pushed all the way in?
Yeah m8 - AFAIK it is all the way in , I am certain that it is the flex ribbon connector that is broken.
For anyone else interested in this or that has the same problem - there is a program called ' my mobiler ' which can be found in the forum somewhere , using it will tell you all you need to know ;
i.e = if it is the phone itself that's broken , or it's a damaged display.

[Q] Backlight only when turning HD2 on, no picture

So this was my first breakdown of a phone...my brother gave me an HD2 with a non-responsive digitizer, everything else seemed to work just fine.
I disassembled it, accidently tearing the flex cable after it gets thin and goes to the volume buttons. Anyway...I replaced the digitizer...thinking I could just modify the volume via software controls, and stupid me had previously set the hd2 to boot into magicdlr always when the phone turned on. So when I turned on the phone I couldn't do anything because it would boot into magicdlr and I had no volume buttons to scroll up and down, and the option selected was boot into windows which was not on the phone (only cm7 was at this time).
Anyway...after getting a replacement flex cable, and reassembling everything, I couldn't get the lcd to work. Backlight would light up, but no picture, no sound, just a vibrate and the backlight turning on. I tore it down, triple checked all the connections, and still the same thing
So I tried a seperate lcd assembly, tripled checked all connections, and still same issue as the above paragraph, backlight but nothing else when I try to power on. I also retried the old flex cable (the one without the volume connector) and that didn't make a difference either.
My only guess is that I messed up the lcd connector on the mainboard, even though it doesn't look visibly damaged in anyway. Does anybody have any other ideas/suggestions?? I would love to get this up and running as its been my first smartphone project...I've done lots of works on desktops and laptops but never smartphones.
gdawson6 said:
My only guess is that I messed up the lcd connector on the mainboard, even though it doesn't look visibly damaged in anyway.
Click to expand...
Click to collapse
This is my suspicion too!Even not visible at first sight, try again with a magnifier!
Good luck!

[Q] Can't upgrade any rom - volume keys not working

Hi . I changed my tmobile hd2's screen .
After change volume keys not working. So I can't update any rom.
Because I can't enter recovery.
How can I upgrade any rom without volume keys.
Can "CWM recovery touch" solve my problem.
Can I upgrade any rom with cwm touch recovery without volume keys
im not really sure about how to initally get into the recovery withour the volume keys, but if you can some how, a touch CMW recovery will work
it has directional keys on the bottom of the screen for you to navigate around
just flash it like you wud a normal recovery with what ever set-up size you need!
http://forum.xda-developers.com/showthread.php?t=1419733
On the non touch cwm (some of them anyway) you can use home and menu hard keys to scroll as well as volume.
But as already mentioned,you can't get into recovery so having touch or alternate keys won't help.
matcoder said:
Hi . I changed my tmobile hd2's screen .
After change volume keys not working. So I can't update any rom.
Because I can't enter recovery.
How can I upgrade any rom without volume keys.
Can "CWM recovery touch" solve my problem.
Can I upgrade any rom with cwm touch recovery without volume keys
Click to expand...
Click to collapse
DO NOT FLASH ANYTHING WITH DAMAGED VOLUME KEYS!!
I flashed a splash screen on mine after damaging ribbon to volume keys and now I have a main board that will NOT recognize these keys even after replacing the broken part, I cant say yours will do this, but mine did soo...
I have replaced two screens on mine, the ribbon to the volume rocker is very delicate i tore two of them on my first screen replacement ( i buy bricked HD2s' for screens). I have had my HD2 now almost two years and no parts are original. Just recently i FINALLY bought one with a busted out screen so i could replace just the main ribbon assembly and a main board that can use volume keys.
This main ribbon sits under your regulatory label ( with the FCC shiz and serial #'s) its integral with your GPS radio, camera assembly, and of course volume rocker keys.
This can be replaced with only moderate difficulty, there are videos even from HTC that explains how to disassemble/reassemble everything safely and in order.
Disassemble
http://www.youtube.com/watch?v=cL-jnUKufC4
Reassemble
http://www.youtube.com/watch?v=t8Q7mXdcJ54&feature=channel&list=UL
I found those after I ripped not one but two volume key ribbons....
To do this you need to pay attention to how the coaxial cables for bluetooth(white) and GPS(black thin) sit, to avoid a few hours of trial and error. getting everything to fit again.
First disconnect the coaxial from blutooth be gentle now, its the white cable at the left of my first image, that phone is nowhere near assembled remember how your cable was positioned. remove and unplug the speaker as well as the vibrator as you move the white cable out of the way, stop pulling it when you hit the screw hole at the top right corner of regulatory label.
Just above where the screw hole is you should see another plug like the blutooth coaxial only black disconnect that and leave it there. try to leave the thicker black cable that leads to camera connected, its ok if it comes out but its a pain to get connected again.
When the top right of your phone looks like my second pic your ready to remove the screw keeping the gps in place thats the top right screw, silver.
disconnect the camera cable from the main board its right next to the battery terminals, the only plug there and hard to miss behind where your simcard goes.
This is important..... right behind the volume keys is the groove thats keeping those coaxial and camera cables in place, under those is the ribbon leading to volume rocker. taking note of how they fit remove these cables from the groove 4th pic
Sorry about the detail cameras are less than perfect on ICS builds and im a terrible photographer on top of that. you must understand that there is a black tape holding those wires together near the mother board, thats right where the volume ribbon is so be careful when you get to that. i just cut/tear the tape holding wires in place, also one of the coaxial cables plugs under the main board right there as well be careful not to disconnect that, you wont hurt anything but its a pain to get it back.
after cables are free from groove you can remove volume rocker. rocker board is held with adhesive just like the camera up top. using fingernail pry the board away from its housing, when its loose from the housing its glued to just let it sit loose, be gentle while getting that loose.
now for the gps/camera, you can fit a small flat head screwdriver between edges of gps board and the plastic of the phone casing, the gps board has clip holding left side so go from the right or the same side that screw was in.
the camera is only adhered so you can put pressure to wherever you feel comfortable its actually pretty solid i have done it a few times and never harmed it.
peel it like you would a sticker down to the main board where it connects under the sdcard then pull it straight back. the last image is what the assembly looks like in tact so have an idea of where not to put too much stress when peeling it.
again DONT FLASH ANYTHING IF YOU RIPPED RIBBON TO VOLUME ROCKER!! This may wreck your main board as it did mine and you'll be stuck on sd builds until you find another main board....
HD2's with busted screens go for about $60-80 off ebay shipped. send me message if you have any q's, also that ribbon/camera/gps assembly in last picture is tested by me and fully functional, also much cheaper than a busted screen HD2 ........
Hi mrbox23,
I believe I have flashed my HTC HD2 (or at least tried) and now I can't get past the HTC splash screen and can't initiate the bootloader!
Hi opened the HTC HD2 and found that the ribbon/flex to volume rocker is cutted!
Now, according to your post it's probable that if I replace the whole main flex I won't be able to initiate bootloadr because the mainboard won't recognise the volume buttons?
Another question is: you said "This may wreck your main board as it did mine and you'll be stuck on sd builds until you find another main board...." this means that I can still use my HTC HD 2 using the sd memory card only with some build? If so can you tell me, or at least, point out some post where to do it? Because in every post that I saw it is necessary to be able to initiate the bootloader!
I would be very gratefull if you could help me on this.
Best regards,
calcaneo

HTC HD2 assembly problem

Hi guys,
I just disassembled my HD2 to replace my broken digitizer and touchscreen.
But now i'm stuck with a problem.
What shall I use to glue both items together again?
And the keyboard makes some issues.
I tried to place both parts over eachother to see if they fit but I can't press the keys after it.
Seems like they are stuck.
That's why I didn't want to use superglue because after assembling it I wouldn't be able to change anything.
Maybe pictures tell more than words.
http://www.youtube.com/watch?v=t8Q7mXdcJ54&feature=player_embedded
hope that helps you
thanks wasn't the information I was looking for but nevermind
I assembled the device now .. but the next problem occured ..
the hd2 is loading without problems (led shows it) but when I try to power it on it's completely dead. nothing happends
with my old touchscreen it was at least possible to power it on.
my question is:
could the new soldered touchscreen + digitizer be broken? or did I break something during disassembly and assembly?
To be honest I didn't see any mistakes I made.
It's not my first time repairing stuff like that because I used to repair notebooks as a hobby.
Still i'm unsure what the heck is going on with my phone atm.
did you check if the flex cable from display is in the port, there is an white stripe that shows how far it must in the port. Did the phone vibrate when you pressed power button?
I checked the cables and found nothing suspicious.
and the phone didnt even vibrate after trying to power it on.
I'm trying to get a new hardkey board (i hope you know what I mean).
Had problems with the keys being stuck and maybe I killed that one by trying to assemble it.
if the phone doesn't recognize me pushing the power on key it's no wonder it won't do anything.
hope this will fix the problem
12dollar said:
I checked the cables and found nothing suspicious.
and the phone didnt even vibrate after trying to power it on.
I'm trying to get a new hardkey board (i hope you know what I mean).
Had problems with the keys being stuck and maybe I killed that one by trying to assemble it.
if the phone doesn't recognize me pushing the power on key it's no wonder it won't do anything.
hope this will fix the problem
Click to expand...
Click to collapse
Most likely something is wrong with your Power button, but you should turn it on with 2nd method:
- pull out battery;
- insert usb cable(connected to PC)/charger in your usb port;
- insert battery.
This way it should turn on whatever OS you have installed on.
If your OS is Android through MAGLDR, connecting it through usb should turn it on by default, unless your battery is not dead!
Check it out!
bib*oops said:
Most likely something is wrong with your Power button, but you should turn it on with 2nd method:
- pull out battery;
- insert usb cable(connected to PC)/charger in your usb port;
- insert battery.
This way it should turn on whatever OS you have installed on.
If your OS is Android through MAGLDR, connecting it through usb should turn it on by default, unless your battery is not dead!
Check it out!
Click to expand...
Click to collapse
I just did as you said and yeah the phone came to life.
so there is definately a dead power button (probably the board is broken)
12dollar said:
I just did as you said and yeah the phone came to life.
so there is definately a dead power button (probably the board is broken)
Click to expand...
Click to collapse
Glad to hear that!
Definitely you should replace your keypad flex!
Did you fix the problem with the hardware keys
Hi,
I have very similar problem.
I changed the touch screen on my HD2 and after reassembling I cannot get the hardware keys clicked.
I ordered a brand new key board and brand new plastic buttons. I received them but situation is the same.
If somebody can explain is there any trick during adjusting the plastic buttons to the clickable "small dots" on the board - please help me.
Best Regards
maznevh said:
Hi,
I have very similar problem.
I changed the touch screen on my HD2 and after reassembling I cannot get the hardware keys clicked.
I ordered a brand new key board and brand new plastic buttons. I received them but situation is the same.
If somebody can explain is there any trick during adjusting the plastic buttons to the clickable "small dots" on the board - please help me.
Best Regards
Click to expand...
Click to collapse
Normally this is always down to glass digitizer not being aligned correctly when stuck to LCD.
0.05mm can make all the difference here.
You need review current digitizer position & pre test assembly to centre chassis without tape for a test run on button function.
Also check button board position is exact & located correctly in the pin holes at each end of the board.
original board quality is normally far better than most of the very cheap eBay pattern parts but one or two sellers offer a decent board around $4.50
Also clean all old tape from back of LCD & centre chassis plate so parts fit flush & once all checked new tape can be added, I also use small spots of up40 adhesive sealant near corners & near middle edges for final build up as holds far better than even the best tapes & gives an original strength & long lasting flush look to final job plus us easily removed with razor blade if repair ever needed again.
Super glue is a BIG no no NO.
Hard to get hardware buttons clickable
Mister B said:
Normally this is always down to glass digitizer not being aligned correctly when stuck to LCD.
0.05mm can make all the difference here.
You need review current digitizer position & pre test assembly to centre chassis without tape for a test run on button function.
Also check button board position is exact & located correctly in the pin holes at each end of the board.
original board quality is normally far better than most of the very cheap eBay pattern parts but one or two sellers offer a decent board around $4.50
Also clean all old tape from back of LCD & centre chassis plate so parts fit flush & once all checked new tape can be added, I also use small spots of up40 adhesive sealant near corners & near middle edges for final build up as holds far better than even the best tapes & gives an original strength & long lasting flush look to final job plus us easily removed with razor blade if repair ever needed again.
Super glue is a BIG no no NO.
Click to expand...
Click to collapse
It is not the case in my case , because I ordered full set (digitizer + display) and they arrived factory assembled.
But you are definitely right - 0.05 mm make the difference. I think the problem comes from the fact that the board with buttons cannot be firmly fixed to the 2 small juts on the chassis. You know the plug of the buttons board is on the tail like extension. Probably when I try to cover the buttons board with the LCD+digitizer - the frame of the LCD slightly pushes the buttons board and the juts on the plastic buttons cannot be fixed exactly on the top of the actual buttons on the board. Anyway we are speaking about precise fixing something around 0.05 mm over something else, which is exactly same size... and in the same time you have to fix this without any visibility.
I will continue trying. If you can give me any other ideas - I will appreciate this.
Thanks
maznevh said:
It is not the case in my case , because I ordered full set (digitizer + display) and they arrived factory assembled.
But you are definitely right - 0.05 mm make the difference. I think the problem comes from the fact that the board with buttons cannot be firmly fixed to the 2 small juts on the chassis. You know the plug of the buttons board is on the tail like extension. Probably when I try to cover the buttons board with the LCD+digitizer - the frame of the LCD slightly pushes the buttons board and the juts on the plastic buttons cannot be fixed exactly on the top of the actual buttons on the board. Anyway we are speaking about precise fixing something around 0.05 mm over something else, which is exactly same size... and in the same time you have to fix this without any visibility.
I will continue trying. If you can give me any other ideas - I will appreciate this.
Thanks
Click to expand...
Click to collapse
Do not rule out the LCD/Digitizer assembly as the china combos are prone to not the best accuracy of assembly as sounds like maybe LCD is mounted just a fraction too low on the digitizer perhaps.
Button board should be fixed via 3M style tape & most replacement boards come with tape ready for fitting.
worth making effort with button board to centre chassis to mount securely then mounting lcd to chassis without tape for a trial assembly & try and check for possible issues such as bent chassis or old tape not removed sufficiently or new assembly alignment not the best.
I would also recommend using original plastic button strip as the copy ones are not always good & have had experience with them before.

[Q] Replacing the keypad flex of an hd2

I replaced the keypad flex of my hd2 today after it was damaged while replacing the lcd/digitizer. Everything went very smoothly but now I have a problem. I was pretty certain when I was placing the new flex into the chassis that I did everything correctly but after I assembled the phone the buttons didn't work / I couldn't feel the "click" when I pressed the buttons, so I assumed I didn't put it right. I disassembled the phone again but nothing seemed wrong with the flex, it was perfectly in position.
When I try to press the buttons on the flex cable with a screwdriver, they work, and the phone boots up with no apparent problem. When I put the keypad on, they don't. Keypad was working fine with the old/broken flex cable.
I've been trying for an hour as to figure out what i'm doing wrong, but i'm at a loss now.
Any ideas?
rivercat said:
I replaced the keypad flex of my hd2 today after it was damaged while replacing the lcd/digitizer. Everything went very smoothly but now I have a problem. I was pretty certain when I was placing the new flex into the chassis that I did everything correctly but after I assembled the phone the buttons didn't work / I couldn't feel the "click" when I pressed the buttons, so I assumed I didn't put it right. I disassembled the phone again but nothing seemed wrong with the flex, it was perfectly in position.
When I try to press the buttons on the flex cable with a screwdriver, they work, and the phone boots up with no apparent problem. When I put the keypad on, they don't. Keypad was working fine with the old/broken flex cable.
I've been trying for an hour as to figure out what i'm doing wrong, but i'm at a loss now.
Any ideas?
Click to expand...
Click to collapse
replace also the keypad or you miss some part between the domesheet and keypad.

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