Backlight not working. Even after replacing screen and USB charging circuit. - Nexus 5 Q&A, Help & Troubleshooting

Hi,
I originally posted here:
http://forum.xda-developers.com/google-nexus-5/help/attempted-repair-n5-usb-port-phone-t3157969
But my issue has somewhat changed. I realised that the phone was still working, and i could see stuff on the blank screen if i shined a flash light at the screen. This led me to beleive it was the backlight that was broke.
I investigated replacement screens and it seems that there a lot of cheap replica screens out there that have their own issues, and rather than pay full price for a legitimate LG part (around £95) I decided to buy a second hand faulty N5 from eBay that had a working screen (£50). The one I purchased had an issue with its mic, and the screen works perfectly fine.
I placed my motherboard into this phone from ebay, but it became apparent that the same issue was happening. The backlight wasnt working in this other phone.
I placed the motherboard from the phone I bought off ebay and it worked with the screen in my own phone!
So the problem seems to be isolated to this part:
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I didnt think the backlight would have anything to do with this, however its the only part I have swapped around. :/
Anyone have any ideas?
Thanks

Same issue?
opencube said:
Hi,
I originally posted here:
http://forum.xda-developers.com/google-nexus-5/help/attempted-repair-n5-usb-port-phone-t3157969
But my issue has somewhat changed. I realised that the phone was still working, and i could see stuff on the blank screen if i shined a flash light at the screen. This led me to beleive it was the backlight that was broke.
I investigated replacement screens and it seems that there a lot of cheap replica screens out there that have their own issues, and rather than pay full price for a legitimate LG part (around £95) I decided to buy a second hand faulty N5 from eBay that had a working screen (£50). The one I purchased had an issue with its mic, and the screen works perfectly fine.
I placed my motherboard into this phone from ebay, but it became apparent that the same issue was happening. The backlight wasnt working in this other phone.
I placed the motherboard from the phone I bought off ebay and it worked with the screen in my own phone!
So the problem seems to be isolated to this part:
I didnt think the backlight would have anything to do with this, however its the only part I have swapped around. :/
Anyone have any ideas?
Thanks
Click to expand...
Click to collapse
Was your problem like this https://www.youtube.com/watch?v=Jq0buYBFdKc ?
I am having this issue, the brightness is very low and still at maximum, the image is poor. I don't know if buying a new mainboard or a display
Thanks!

Related

Haha, busted screen

http://i42.tinypic.com/2qio03q.jpg
(image is too big for
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ouch. that hurts.
Cool !!! Is there a cab you can share for this or I just have to use a hammer?
LOL...
freco said:
Cool !!! Is there a cab you can share for this or I just have to use a hammer?
LOL...
Click to expand...
Click to collapse
Ha Ha now thats a CAB I need
Can you replace the screen and front plate?
Ouch
Had this once with my universal, had to pay 170 ,- € to fix that.
My wife could´nt understand why i had to repair it instead of buying a new phone.
They will never understand our addicting hobby! Hobby? Passion! Destiny!
Dang that hurts me looking at it. Is there a writeup on screen replacement on this yet?
here is the service manual:
http://htcwinmobile.blogspot.com/2009/03/htc-raphaeltouch-pro-service-manual.html
whoa! thats bad ...
its touch pro breaking season or something, how did this happen?
My condolences.
I have a busted Touch Pro that with a good screen...the phone was run over by a car. Kind of mangled but powers on, cant make calls, everything else works but stuck in landscape. Funny thing is that the screen is flawless while everything else is about shot
same here man, got ran over by a car, everything worked except the lcd panel, i swear those Digitizers are strong or something cause they dont seem to crack or stop functioning easily
damn!! feel sorry for you man. claim your insurance... if you had any that is in the 1st place!
Yep, it's gone for insurance-repair.
How this happend? Just took it out of my pocket when I was in a bar and noticed the screen was cracked. It still could be an assasination
jorann said:
How this happend? Just took it out of my pocket when I was in a bar
Click to expand...
Click to collapse
Unexplainable things happen to me when I'm in a pub too!
How is that funny? Unless it's not yours?
I'm a bit surprised some TP's survived car run-overs. I think it's worth the fix if it costs $150+ to fix when a new one is over twice as much.
oh jeez, do you keep the screen facing towards your leg when it's in your pocket? i usually keep it faced towards my leg now because my old phone cracked after hitting the edge of a table.
I don't really pay attention to which way it is facing, specially when i'm in a bar, being a bit intoxicated
I had the same porblem except my screen was not cracked. I had the same lines even though they were not so bright. So i sent my phone intor HTC for warranty repair and suprisingly they fixed it for free and sent it back to me just 3 days ago.

[Q] Replacement Digtizier Problems

I own a Droid 4 and recently dropped it, cracked the digitizer, and replaced it. Now my touch screen is only detecting these thin horizontal lines on the upper half of the screen. I'm wondering if it's possible that I screwed up the phone on disassembly/reassembly or if it's more likely that the new digitizer is defective.
Has anyone seen anything like this before?
Thanks,
Alex
P.S. The attachment is a screen shot of my phone running an app which detects points sent by the touch screen/digitizer and records them.
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Bump
Firstly - please don't bump your own threads, and certainly not until at least 24 hours have passed.
Secondly - The reason for you not getting a reply is likely due to the fact that XDA is actually supposed to be a "Development" site, not a "Hardware" site
Thirdly - The likelihood is that you either;-
a) bought a cheap, eBay special digitiser which is not fully compatible
b) didn't get the connections right on install
c) broke something else inside the phone when you dropped it
Start off by taking it all apart again and rebuilding it, if that doesn't work then decide if you want to spend more money buying another digitiser or just ditch the phone and get a new one.
P.S. Why include a pointless poll for this thread?
P.P.S. Not sure why, but you have made two posts and XDA shows you as only making one. Strange.
That is classic yo, made my night. Well I was just checkin in here cause I couldn't find a more appropriate forum. I figured someone might know something, but yeh sorry bout the bumps. Although it did get you to respond, hopefully I didn't break something. I don't think so because everything on the phone works perfectly, I even fixed the little headset speaker. After much arm pulling I finally convinced the company to give me a refund, we'll see if a new one does the trick.
SimonTS said:
Firstly - please don't bump your own threads, and certainly not until at least 24 hours have passed.
Secondly - The reason for you not getting a reply is likely due to the fact that XDA is actually supposed to be a "Development" site, not a "Hardware" site
Thirdly - The likelihood is that you either;-
a) bought a cheap, eBay special digitiser which is not fully compatible
b) didn't get the connections right on install
c) broke something else inside the phone when you dropped it
Start off by taking it all apart again and rebuilding it, if that doesn't work then decide if you want to spend more money buying another digitiser or just ditch the phone and get a new one.
P.S. Why include a pointless poll for this thread?
P.P.S. Not sure why, but you have made two posts and XDA shows you as only making one. Strange.
Click to expand...
Click to collapse

Yellow-ish tint on note pro 12.2

I bought 3 note pros, 2 were bought as soon as it was released here in Canada for my father and girl friend, and another one just few days ago for my self.
then i found out as soon as turned the new one on, the white color produced by later wasn't quite white compare to the ones i bought several month ago. and maximum brightness wasn't as bright as the first two as well.
so i decided to exchange, went to the future shop with my girlfriend's tablet to show the difference in white color and brightness. I opened up a new box right in front of customer service and guess what it has same problem. I asked for another set and the technician refused to do so saying there's nothing wrong with the unit. so i took my girlfriend's tablet out and show him how bad the screen is compared to old tablet and told him me being picky with 800 dollar tablet's screen is normal, he could not say a thing and opened up another box telling me he would not open up another one anymore because "company cannot make any money selling openbox item" which i think is DEFECTIVE UNIT rather than open box. He said he will do return if i am still not satisfied. (Can they really do that? seriously? now i am thinking i might complain this matter to head now..)
anyway the new one had the same problem, so i had to return the unit that they will not exchange anymore regardless... and went to best buy across the street and the first unit i opened was same thing again so i just kept it assuming Samsung might have changed the panel or something.
my point is.. LCD panels used in later batch of note pros might be differ from the first batch and it is really bad compare to the first batch.. or i am just being super picky.....
i will take a picture later tonight to show you guys as well.
is anyone having similar problem with recently purchased unit?
Are the screen modes all set the same across all three devices? (Referring to Settings--> Device--> Display--> Screen Mode, also check Reading Mode is off).
Sent from my SM-P900 using Tapatalk
muzzy996 said:
Are the screen modes all set the same across all three devices? (Referring to Settings--> Device--> Display--> Screen Mode, also check Reading Mode is off).
Sent from my SM-P900 using Tapatalk
Click to expand...
Click to collapse
Yes thats the first thing i did. Ser brightness to max, reading mode off and tried 3 different modes one at a time.
Odd. Ironically there were early complaints that the display doesn't do yellows well lol.
Sent from my SM-P900 using Tapatalk
Here's a comparison between my 12.2 and my Nexus 10.
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I have the same exact problem. The yellow and green have 'black dots'. It looks awful! Is there any solution?

After a minor fall, my screen is as good as dead

Hi there, just thought I would share this with you and ask what you think.
So, I have a Moto G 3rd (bought it a month ago), I quite liked it and was a good upgrade from my original Moto G. However, I never expected it to be so fragile. After one small fall (like 30 cm) my screen seems to be completely messed. I mean the display, as outside the phone is just fine, no cracks or anything, and it was the first time I dropped it. Here's a picture:
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This is really disapointing, and I'm in complete shock, as probably warranty won't cover it and the phone was a major investment for me. Has any of you had a similar experience? Is the moto G not as resistant has it once was? The original one could take a LOT of damage, and it just dying like this on me breaks my heart.
So, what should I do? I contacted Motorola on the website and after a long talk they basically just told me to go to the store where I bought it, which I'll do thursday (it's far from where I live), but I fear they won't offer help. If they don't, is there a way to still send it to Motorola and pay for the repairs? I've tried china replacements on other phones and was never quite satisfied, and this is a new phone :/
Thanks for reading, needed to share my pain!
That's exactly what happened to my previous phone (samsung galaxy s3 neo). Screen was ok, also because it was protected by a tempered glass, but the lcd broke and only showed a few purple lines.
Unfortunately, the outside screen spare was quite cheap (30 euros) while the lcd repair was 120 euros, so I decided to buy the moto. A bumper should protect from this kind of accident.
I'm afraid it's bad news.
Hi guys, just here for a quick update.
I went back to the store and since the device was in very good shape they sent it to warranty and said it could go off has a gpu fault.
I'll update when I, hopefully, get it back!
tiago_c said:
Hi guys, just here for a quick update.
I went back to the store and since the device was in very good shape they sent it to warranty and said it could go off has a gpu fault.
I'll update when I, hopefully, get it back!
Click to expand...
Click to collapse
Great news, let's keep finger crossed and hope they can fix it for free.
Hi again!
Just here to tell you guys I got my phone back and the repair was covered by warranty! Hope my story helps if anyone runs into similar trouble. It was fairly quick too! (2 weeks)
Bear in mind my phone only had 1 month and was in really good shape (no scratches).

PX5 suddenly bricked?

Hi guys,
First post but been reading the forums for a couple of months (excellent source to learn Android).
I bought a Dasaita PX5 headunit and installed it with no issues. Everything was great.
One day on my commute to work I had Waze navigation running and all of a sudden screen went completely blank.
Tried to reset and even though the lights blink in the touch buttons nothing happens.
Discussed with Dasaita support and they sent me a new core board.
I installed the new core board today but unit is still dead. Screen is completely blank.
Any suggestions?
Only had factory stock rom and never tried to flash a custom rom.
I’m desperate here. Bought the unit 8 weeks ago and have had it running for less than a week. Shipping of new core board took ages and I had to pay additional customs fee.
Really hope someone has a good idea
Sounds like the screen conked out. And/or connections between the motherboard and the screen.
What they should have done is sent you a new unit instead of a core board, because that unit ought to be under warranty.
Regardless, did you notice if the connectors going to the screen were loose or ajar? Did you reconnect them?
Did check screen connectors when I changed the core board. Everything was in place.
They now agreed to send me a new unit so now I can just wait. Hopefully the new unit will work with no hiccups.
In my case, The solder of the motherboard was melted and it was short-circuited.
Nothing was displayed on the LCD. I cold only see the touch key backlight.
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This unit was sold by Dasaita (HA), And repaired by cleaning using a solder suction line.
The motherboard looks very ugly, but I only cleaned part B. You better consult a person with expert knowledge before doing it.
warata said:
In my case, The solder of the motherboard was melted and it was short-circuited.
Nothing was displayed on the LCD. I cold only see the touch key backlight.
This unit was sold by Dasaita (HA), And repaired by cleaning using a solder suction line.
The motherboard looks very ugly, but I only cleaned part B. You better consult a person with expert knowledge before doing it.
Click to expand...
Click to collapse
can I know, did you manage to get the unit up after cleaning it? i'm facing the same issue now so i might want to try these fix
izzamk said:
did you manage to get the unit up after cleaning it?
Click to expand...
Click to collapse
Yes I did. But if it fails, your unit will be a complete trash...
Hello friends,
I‘m new here but I have the same problem like the thread starter. Im from germania, so my english is not the best
My story :
Last year in august i ordered my Witson rv5336.
It all worked fine, but this monday nothing worked any more.
The screen is black, no sound no reaction to the touchscreen. Only the keys are lightning. Tried to do a hard reset, only the keys are blinking.
Witson, the manufacturer, said i need a new coreboard. But for me, it sounds like a dead screen?
What do you think?
Greets
Niclas

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