Hi guys
I just changed my mi 9 lite display incl frame the other day. Old one was cracked and dead.
Followed a legit online instruction on how to do the procedure and it went quite well. At least that's what I thought...
It appears that I might have caused damage or done something to the mainboard. If I put everything were it's suppose to be and fit the mainboard with the screws the phone gets stuck in a bootloop as soon as it starts. It starts showing the Mi logo and then it turns black and starts over and over until a disconnect the connector from the battery.
However if I lift the mainboard from the frame just a few millimeters the phone is able to start and the screen works.
I figure I have damage some part and I'm guessing it won't be a fixable issue unless I change the main board. I just want to reach out to see if anyone has run into something similar or happens to know if I've done a simple and fixable error.
Here's a video of the bootloop:
https://imgur.com/a/JOcap23
All type of help is appreciated!
The mobo was likely damaged by the impact. BGA chipsets are particularly sensitive to board flexing and no way to examine the hidden solder joints for damage. Use optical magnification and carefully examine all visible solder jionts for fractures. Double check all connectors for damaged pins.
The mobo is suspectable to ESD damage as well when out of circuit. ESD protocols should be observed. I don't think this is the issue here though but keep it in mind. Static electricity can kill unharden inputs... or cause failures days, weeks even years latter. Insulation at semiconductor junctions is only microns thick and their over voltage tolerance is very low.
Related
Hey guys,
I recently bought a Samsung Galaxy S i9000 and the Amoled screen has some serious issues with colours. It appears that the red part of the screen is messed up and cannot display any true white anymore. This happens in download mode, recovery, even in a custom ROM. It's definitely hardware. This video should explain it:
Yes, this phone is pretty much screwed, and the home key is no longer functional at all now. However, I've fixed the rotation sensor issue, and I've thought about repurposing it at a remote for my XBMC media center
Firstly, has anyone seen this issue with the screen before, and secondly, has anyone fixed it? It may be an internal connector which is loose. Suggestions would be good, otherwise I'll just have to put up with the annoying blue tint.
Cheers!
Anyone? Is this more likely to be the panel itself or a cable? Wondering if it's fixable or maybe the connector could be corroded...
Take it apart, remove the mainboard, and clean the board with Isoprophyl-alcohol. Its a 70% alcohol, here in germany you can buy it in a pharmacy. I use a paintbrush to get electronics clean safly.
And also clean the connectors that go from the phone to the board with the alcohol. I suspect there is some kind of water damage in your phone. Samsungs are realy *****y when it comes to water. Even sweat sometimes is enough to cause problems.
To take it apart you only need to remove the 7 screws under the back cover, pull of the back and the board is just held in place by the connectors.
Try youtube if you get stuck. There are some Galaxy S disassembly videos.
Hello,
So I broke my screen on my HTC One and decided to repair, having done so before on previous phones I didn't think it would be a problem. Unfortunately upon installing the new screen all I got was a coloured and white pixel noise. Thinking it was a faulty screen I returned it to the supplier and sent off for a new one from a different seller. The new one has exactly the same issue however so now I think I have to conclude it is some sort of hardware issue, possibly caused by static during repair or something along those lines.
The bugger is that there were no issues with the repair itself, it was taken apart carefully and none of the cables damaged, wiggling or otherwise removing and replacing the ribbon cables that are responsible for the LCD has no effect on the noise pattern at all, it remains constant.
I can tell the ROM is running beneath the surface as it has the feature to turn on the flashlight with a long hold power press, and this still works. So the issue is purely with the processing of the image sent to the LCD.
I am unable to test the original LCD as the original cracks cause it to get too badly damaged to work during the original repair.
So I'm basically wondering if there is anything I can do to try and fix this, is there a part I can replace that deals with the LCD image or anything like that? I have a distinct feeling the phone is buggered, but it would be foolish not to ask the community here before sending it to the grave.
I have just discovered a damaged part on the circuit board just behind where the ribbon cable attaches to the mainboard. It is one of the very tiny little black squares, there is a row of 5 and one had a corner that looked damaged and came away when lightly scraped with a tool.
I think this must be the source of the problem, and I would guess means a new mainboard.
I've already got plenty of trouble with my Xperia. At least now, it's running again. But I have the problem that the virbator motor is ultra-sensitive, in a way that it will vibrate even when it's off, uncontrollably.
I pressed on the spot where the battery connector and 2 other connectors on the side are located. Most probably it's the connector to the left of the battery connector if you look at it from the back.
I guess that this connector is faulty, or the connection is bad after the phone fell from 2 feet flat onto a tile floor. There is no visual damage.
Is there someone with technical knowledge about the Xperia Z? I can write down the exact timeline of signs and LED's I got and during which action. It's definitely a hardware fault, but rather a soft fault which lies in the connector I GUESS.
Any help is much appreciated!
Hi
I tried to replace my battery and after assemble it back i only get a black display when turning my m7 on.
I broke this little plastic thing from the display cable off (look in attachment)
Is this thing essential for a working display? (i thought i can fix it with a drop of glue)
Should the display work when the backcover is off the device? Because there are some connectors on the backcover....
cheers
00Nuclear00 said:
Hi
I tried to replace my battery and after assemble it back i only get a black display when turning my m7 on.
I broke this little plastic thing from the display cable off (look in attachment)
Is this thing essential for a working display? (i thought i can fix it with a drop of glue)
Should the display work when the backcover is off the device? Because there are some connectors on the backcover....
cheers
Click to expand...
Click to collapse
Shouldn't have done that, I think you accidentally broke something. I'd send it to a HTC service center. But that's gonna cost you probably.
nah, official repair isn't worth it. The phone is more than 2 years old...
and yes i think i broke something... thats why im asking
You're gonna have to be good with a solder and a couple of tiny wires if you want to revive your phone.
00Nuclear00 said:
Hi
I tried to replace my battery and after assemble it back i only get a black display when turning my m7 on.
I broke this little plastic thing from the display cable off (look in attachment)
Is this thing essential for a working display? (i thought i can fix it with a drop of glue)
Should the display work when the backcover is off the device? Because there are some connectors on the backcover....
cheers
Click to expand...
Click to collapse
You definitively need this clip to be intact so the flex cable sits firmly in place otherwise you'll have bad contact between the cable and the pins.
If you don't want to send to HTC for repair you'll need at least to send it to your local electronic repair shop so someone skilled with the proper soldering tool (not the standard iron you have at home) can replace the connector. BTW some of these clips must be lifted from the cable side and some other from the opposite side of the cable, so next time use tweezers and apply very light force on each side you'll find from what side it must be lifted.
LCD should work fine with the back cover removed, afaik. Connectors in the back cover are often for antennas but I wouldn't recommend to run the phone with antennas disconnected to avoid damaging the radio chips (reflected power).
If you are from the US, you can easily find this connector on ebay for about 10$. I'm sure it won't be that much expensive to repair if you bring the new connector and the phone already disassembled to your local repair shop.
Btw are you sure its only the LCD? When trying to boot the phone can you here the HTC theme or does it vibrate? Recognized by your computer when connected with usb?
thx for your response
I found an replacement part on ebay but first i have to look for someone who can solder this for me.
When i try to turn it on it only vibrates without a htc theme sound and there is no display reaction.
The other thing i mentioned is that the phone gets very hot in the middle (should be the cpu) where i dont know if it should get that hot.
I have to try the pc connetion again and let you know asap.
00Nuclear00 said:
thx for your response
I found an replacement part on ebay but first i have to look for someone who can solder this for me.
When i try to turn it on it only vibrates without a htc theme sound and there is no display reaction.
The other thing i mentioned is that the phone gets very hot in the middle (should be the cpu) where i dont know if it should get that hot.
I have to try the pc connetion again and let you know asap.
Click to expand...
Click to collapse
I'm not really worried about the absence of HTC sound when booting, if your phone is on silent / vibration mode, it will only vibrate when booting. If your computer does detect it once booted, then I guess the broken connector clip is the problem.
---------- Post added at 09:49 AM ---------- Previous post was at 09:27 AM ----------
Here is a video about the connector replacement, it doesn't look that hard to replace but wouldn't recommend to do it yourself if you never soldered electronics before. Soldering isn't that hard but you need some practices and knowledge to make good joints. I don't think your phone motherboard is a good candidate to practices yourself if you never did it before. You'll also need a really tiny tip for your iron, probably a type "L", 50/50 solder + some flux. Flux must be cleaned after use to avoid corrosion. The most difficult when soldering on motherboard, imo, is to find the right temperature. If your iron is to hot, you'll damage your connector. If its not hot enough, solder will take more time to liquefy and some heat will be absorbed by surrounding components which can cause irreversible damage.
Easy fix mate
You don't need to replace the connector, I've done this before, it is just the connector clip that has come off and it goes back on reasonably easily.
You will need a good magnifier.
You will need a good light source.
The phone held securely on its side with the socket pointing up.
Some masking tape on the loose part because it WILL go "ping" into the distance if you don't and you will not find it.
Look at the other connectors to see the proper orientation for the part, mark it with a permanent marker on top and at one end.
The insertion looks difficult, it isn't too bad, keep the part nice and straight and the motion is kind of like clicking it down on the ribbon.
Forget replacing the connector, that is 100 times harder.
If you do lose the loose part I have one or two laying around.
Good luck.
Good day to everyone!
I confronted backlight issue on my Z3 Compact when replacing LCD. When turning on the phone I couldnt see anything but phone responds to my touches. I took a flashlight and I pointed it directly at the display and I could barrley see icons.
So if you are having this issue follow my steps.
(Im not responsible if you fry your device do it at your own risk *I'm a professional*)
Remove motherboard from the frame and find SMD fuse has V on top of it on the mobo, lt's bellow metal frame that covers resistors and capacitators.
Remove or keep the fuse then get your soldering iron and heat it about 335°C. With slight touch make a jumper on the fuse, if you removed the fuse like I did just solder tiny wire on those 2 metal plates where fuse used to be soldered. Assemble it all and viollaaa your backlight will hopefully work again.
Guys if this helped you, hit me with that thanks means alot to me! Much love and good luck:angel:
kenzyyy said:
Good day to everyone!
I confronted backlight issue on my Z3 Compact when replacing LCD. When turning on the phone I couldnt see anything but phone responds to my touches. I took a flashlight and I pointed it directly at the display and I could barrley see icons.
So if you are having this issue follow my steps.
(Im not responsible if you fry your device do it at your own risk *I'm a professional*)
Remove motherboard from the frame and find SMD fuse has V on top of it on the mobo, lt's bellow metal frame that covers resistors and capacitators.
Remove or keep the fuse then get your soldering iron and heat it about 335°C. With slight touch make a jumper on the fuse, if you removed the fuse like I did just solder tiny wire on those 2 metal plates where fuse used to be soldered. Assemble it all and viollaaa your backlight will hopefully work again.
Guys if this helped you, hit me with that thanks means alot to me! Much love and good luck:angel:
Click to expand...
Click to collapse
helo @kenzyyy, it has help me when my phone was lost the backlight.. thank's for that
now i have a different issue, backlight is show but no display at all.. i still can touch, receive phone call, with scrcpy on my laptop i can see my phone work normally except the display not show
which one fuse to jumper for bringing the display back
i've post a thread HERE and still trying to find my solving problem..
thank's
sorry for my bad english