[Q] HTC Desire(Bravo) not powering on after mobo replaced - Desire Q&A, Help & Troubleshooting

After replacing ribbon flex motherboard my phone fails to switch on. I noticed replacement does not have metallic ground tape wrapped around the upper section of the flex cable. Do you think this is the problem or is it something more hidden? This is uncharted territory for me as I've been unable to find any instructions on how to replace a damaged flex ribbon motherboard. Can any one suggest a way forward?

There was video here hosted on YouTube. Look for it. Desire tear down was shown in it.
Sent from my Nexus 10 using Tapatalk HD

Related

[Q] Replaced LCD twice, only backlight comes on... What to do, now!?

Hey Boys n Girls!
I made a mistake and bought off eBay a phone with a "not working LCD":
" This is a used HTC Desire Z smartphone. The item was dropped on water and immediately pulled out. The LCD screen doesn't work anymore as some cable inside is cracked. Everything works fine, touchscreen, menu and the device boots fine, you can hear the sound etc but no image. Anyone can fix this if you have an LCD spare for HTC Desire Z and the phone can be used and works fine, just the LCD needs replacing. Comes with original box, manuals and battery but no charger or data cable. I want to sell this fast so Happy Bidding!"
, also ordered already from two different seller LCD replacement screens neither of them worked. Backlight works on both but nothing else. Im quite puzzled what to do next...
Anyone got any idea?
Please let me know! THanks in advance!
Sounds like some cable is not working, rather than the two screens you've purchased! There is a guide somewhere here for all of that stuff. Best of luck mate!
captainreynolds said:
Sounds like some cable is not working, rather than the two screens you've purchased! There is a guide somewhere here for all of that stuff. Best of luck mate!
Click to expand...
Click to collapse
If you could kindly link that guide, it would be very much appreciated! Thanks!
try searching for ribbon cable. You should prob just take it to a cell phone store. Phone geeks in San Marcos did my repair for 70. I was texting gf while playing golf in pouring rain.
Sent from my SGH-T989 using xda premium
Here is the link to the teardown guide: http://forum.xda-developers.com/showthread.php?t=863919
The flex ribbon cables are not that expensive. If you were comfortable replacing the screen, I would say you have the ability to replace the flex ribbon cable without a problem.
beefynick said:
If you were comfortable replacing the screen, I would say you have the ability to replace the flex ribbon cable without a problem.
Click to expand...
Click to collapse
Im going to order it tonight and give an update as soon as I got the flex ribbon cable.... I assembled and disassembled so many times already soon will be able to do it blindfolded
Also while you have it apart clean the logic board with denatured or pure alcohol and a soft bristled brush. Let it dry completely! That way it won't corrode further from the water damage!
killj0y said:
Also while you have it apart clean the logic board with denatured or pure alcohol and a soft bristled brush. Let it dry completely! That way it won't corrode further from the water damage!
Click to expand...
Click to collapse
I will do that since it will probably take like 2 weeks to ship the flex ribbon from China Thanks Man!
modzsi said:
I will do that since it will probably take like 2 weeks to ship the flex ribbon from China Thanks Man!
Click to expand...
Click to collapse
No prob cheap insurance plus it could even since a current or future problem I do this work for people can you tell lol. Denatured is best otherwise I think 97 is as pure as you'll find. Most stores carry the latter.
Ps be gentle no need to go medieval on it
Replacing the Flex Ribbon Cable solved my problems.... Cheers Everyone!

[Q] swapping logic boards between 2 phones?

I have a samsung epic 4g with a broken usb port, I'm considering swapping the main board with another epic (I would buy one with a broken screen or something) would this cause conflict and make the phone unusable? Also, would it change the ESN of the phone?
ESN is tied to motherboard so as long as it is a clean one you can use it and transfer the account.
Sent from my PantechP4100 using xda premium
I actually did that quite recently and it worked fine. What you need is a #000 phillips head screw driver and some sort of prying tool, a guitar pic works well. Just unscrew the 7 screws on the back. 3 on each side one on top middle.
Then use the prying tool to pry off the black back.Take off the antenna and two flex cables. swap the now free motherboard and just reverse the process. You can find guides to do this online. Its an easy process but you need to remember 3 things.
1. Try not to lose any of the screws or buttons (they are tiny)
2. When prying the back make sure ur careful, along with taking out the antenna and flex cables. They can brake
3. Swap the sticker underneath the battery. The information relates to the motherboard not the phone/antenna.

[Q] Dead volume buttons

Hey everyone,
So today, I was changing the housing for my GNex and I forgot to remove the SIM card (I know, silly me.) By removeing the housing with the SIM card stuck there, I ended up severing the connectors for the volume buttons beyond repair.
The connectors are soldered to the main board, and it doesn't look very replaceable, so I'm wondering if its possible to order replacements for the broken part? And is the repair very difficult so I'm better off taking it to a repair shop?
Thanks for any information.
So I figured that the broken part is called a volume flex cable. Can't seem to find any info on installation though...
Sent from my Galaxy Nexus using xda app-developers app
You can find the part here:
http://www.dealrepairs.com/samsung-galaxy-nexus-i9250-volume-flex-cable_p2335.html
And see that it's soldered with tiny 3 points here:
http://www.ifixit.com/Teardown/Samsung-Galaxy-Nexus-Teardown/7182/1
I believe the repair is possible with a steady hand and a good solder iron.

[Q] What is the purpose of the front camera flex cable?

Recently, I disassembled my Sony Ericsson Xperia Play R800at. I was replacing the housing and digitizer. All went smoothly until I missed an important step. There was a black tab that holds down the flex cable that connects to the digitizer. I forgot that step and my flex cable ripped.I have ordered another as a replacement. I understand that this will cause the digitizer to not work, but I have more issues, and I want to know if they are due to the missing cable.(the ripped flex cable.) I assembled the phone and the screen functions normally. As to be expected, I can't interact with the screen. However, Now my search button and settings buttons aren't functioning. My home and back buttons are working although. Also, My phone will not charge anymore. Is this due to the missing flex cable? I hope I didn't accidentally screw anything up. I was really careful, so I don't know why they won't function. I really hope that these issues are due to the missing cable. :silly:
Sorry, I am not allowed to post links.It has the camera and earpiece on it and is attached to the slider. :"(
How. Could u miss a step itsm really easy to take apart and put together its the flex cable garunteed
Sent from my Sony Tablet S using xda app-developers app
Tutorials
Most of the tutorials seem to be only of disassembly. Little to none are of reassembly. I wrote down a list and reversed the order, but as it got closer to assembly, I started to assemble it myself. Big mistake. I assumed the black tab was only there to hide the chips.
Charge Recognition
It actually can charge, but only when the phone is powered of. This must be due to the missing components. Maybe because some parts of the phone aren't connected, the phone will not recognize the charger when powered on. What a relief...:angel:
Just watch dissassembly in reverse
Sent from my Sony Tablet S using xda app-developers app
I got the replacement part. I even replaced the slider. I transferred the button cable to the new slider along with the main flex cable and the camera/earpiece flex cable. I am confused. I am inserting the flex cable into the digitizer slot, but it isn't working. I assumed there was a lock mechanism of some sort, but still no luck. I am not sure why it isn't going all the way in. Reversing the steps just isn't working. Placing the flex cable in is way harder than taking it out. Is there a certain way to place this cable in. What I am in need of is a picture of how a functioning digitizer's attachments look. Are you supposed to be able to see the golden tip of the flex cable?(Again, I am speaking of the flex cable with the black tab covering it. It is very small.)
:crying:
Lock.
There were locks for just aboul all the ZIF Connectors. Sony Ericsson's manual is the best!:good:
I tried again using the locks on the slots but it still wont work. Even with the manual, no luck... Now, it is charging normally, even while on. This indicates that something has changed. I wonder why the digitizer isn't working though. Maybe I should see what happens If I revert back to my old digitizer...

I Can't Touch the Part of Screen Though Replace Digitizer.

When I disassembled my xperia play for the first time,
the screen digitizer was damaged by my mistake.
I can't sure that, but I guess it can be.
At that time,
the bottom of screen (about 1/3?) didn't work.
So I bought the screen digitizer,
and replace it today.
But the problem hasn't been solved all the way.
If separate into 6 parts the screen from top.
(For example the top part is 1st part.
And beneath 1st part is 2nd part.)
5th parts doesn't work.
But the bottom 6th part works well.
I don't want to buy else new screen digitizer.
Please let me know how to use my xperia play with any problems.
Please help me.
Thanks about reading my thread.
Jaehyeok Koo said:
When I disassembled my xperia play for the first time,
the screen digitizer was damaged by my mistake.
I can't sure that, but I guess it can be.
At that time,
the bottom of screen (about 1/3?) didn't work.
So I bought the screen digitizer,
and replace it today.
But the problem hasn't been solved all the way.
If separate into 6 parts the screen from top.
(For example the top part is 1st part.
And beneath 1st part is 2nd part.)
5th parts doesn't work.
But the bottom 6th part works well.
I don't want to buy else new screen digitizer.
Please let me know how to use my xperia play with any problems.
Please help me.
Thanks about reading my thread.
Click to expand...
Click to collapse
Are you sure it's digitizer problem? Maybe it's flex
I had similiar problem, but in my case whole touchscreen didn't work and it happened randomly on reboot
It turns out that when i was repairing my usb port i somehow didn't place flex cable properly and it was bended over that metal part of slider.
Once i reopen it (only the part with motherboard on it) and place flex cable properly, touchscreen started to work normaly
How old is your Play? When you opened it, does flex cable looks damaged?
Where did you buy your digitizer? If it was from eBay, you could ask for a replacement from the seller you bought it from.
Like Bakisha, it could be the flex cable. If you know the digitizer is working, it usually is the flex cable.
Bakisha said:
Are you sure it's digitizer problem? Maybe it's flex
I had similiar problem, but in my case whole touchscreen didn't work and it happened randomly on reboot
It turns out that when i was repairing my usb port i somehow didn't place flex cable properly and it was bended over that metal part of slider.
Once i reopen it (only the part with motherboard on it) and place flex cable properly, touchscreen started to work normaly
How old is your Play? When you opened it, does flex cable looks damaged?
Click to expand...
Click to collapse
In fact, the flex cable of my xperia play looks a bit little.
The black color had been painted on cable wear a little.
So do you recommend me to replace flex cable?
RoboticBuddy said:
Where did you buy your digitizer? If it was from eBay, you could ask for a replacement from the seller you bought it from.
Like Bakisha, it could be the flex cable. If you know the digitizer is working, it usually is the flex cable.
Click to expand...
Click to collapse
If I ask for sending normal item without any problem again, should I send to seller the screen digitizer ?
Jaehyeok Koo said:
In fact, the flex cable of my xperia play looks a bit little.
The black color had been painted on cable wear a little.
So do you recommend me to replace flex cable?
Click to expand...
Click to collapse
Well, you could open your Play and see if flex cable properly placed. Open slider and put that white plastic inside metal frame. Put back dpad part of phone back, but keep an eye on that white plastic, it have two holes in motherboard to go into, then screw those two screws on motherboard (so it will make flex cable plug in motherboard - look if jack is now properly inserted
Close it and try it.
If you again have problems with touchscreen, then you have two options. Replace flex or replace digitizer. It's hard to say wich is faulty...
Sent from my R800i using xda app-developers app

Categories

Resources