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Very Dim Screen on AT&T Tilit - Backlight issue(?)

Here's my story:
I recently bought this phone for only $125 - not bad deal if you ask me. I knew from the beginning that the screen was a little mess up, even the guy I bought it from knew that. You would need a flash light in order to see what was on the screen. From any other point of view, it's just totally dark/black. So the guy was gracious enough to include a new lcd screen which he ordered to replace the old one. So I decided to undertake the task of putting it in myself. Once that was all said and done, I powered the tilt up and it was doing the exact same thing before I put the new lcd screen in, which was not lighting up the screen and it was still very dark to see anything.
With a flashlight, you can see that it's still working and the touchscreen works fine too. I think another person posted a thread with the same problem, but no one really replied back to him. Has anyone come across this problem before? Some have said that it's the flex cable that connects to the front d-pad and lcd screen itself is the cause for the back light issue. Any suggestions out there?

If I were you I'd try to figure out the pinouts for the LCD panel. Try to see if the Kaiser is outputting the necessary voltage for the backlight. Also try the opposite and apply voltage to the LCD to test the backlight.
Unless it is 2 back LCDs, I'm assuming there is a fault somewhere internal and not turning on the backlight.
I've never taken my tilt apart, but this is where I would start.

I wouldn't know where to begin to troubleshoot a device like this. Lol! It's fairly easy to take apart - there's actually a video on youtube that takes you step-by-step. I guess this isn't as common as some problems are, but I don't want to spend money having someone else fix something that could be so minute. And prices for some of the replacement parts are almost as expensive as what I bought the phone for.
When I took my tilt apart, physically, everything looked good from what my eyes can see. A little cleaning here and there, nothing major. The guy who had it before me flashed the rom to try and make it look like it had touchflo on it so I reflashed it back to the original rom software (or at least, whatever was on the HTC website). I tried doing hard resets, soft resets, rom flashing and everything, still no luck.

[Q] G1 motherboard fault causing dead touchscreen

I have been trying to repair this phone, but the usual faults have not turned out to be the problem. This is the background on the repair efforts:
In my research I found 3 main causes for a dead touch screen.
1) Corruption of system software.
2) Failure of digitizer cable (hinge FPC)
3) Failure of digitizer screen (touch panel)
To check for #1, I flashed the firmware again (after a wipe). I downgraded to Android 1.5 because I wanted to root the phone and install CyanogenMod Android 2.2 Froyo.
This was a big mistake because I learned that when you don't have a working touch screen, you cannot get past the "Touch the Android to Start" screen.
So on to step 2 - replace cable (hinge FPC). I have a G1 parts phone that was lightly used in good condition before it was damaged. There was no damage to the sliding section, so I expected the hinge FPC to be in good condition.
So I installed the hinge assembly with its hinge FPC from the parts phone, but this did not work either.
So next I installed a new touch panel (digitizer screen), but that did not fix the problem either.
I had a chance to borrow a working G1 motherboard, and I was surprised to see that the phone was working with the borrowed motherboard.
So my question is whether my problem motherboard can be recovered with a software solution, or if these symptoms indicate a hardware failure.
I thought that a wipe followed by firmware flash would eliminate all soft system errors, but I am not sure if the wipe and flash really erase absolutely everything, or if there is something else I need to do to get it working again.
Thanks.

more than likly it was the point in the motherboard where the flex cable connects. try using some electronic parts cleaner.
i have ran into this a few times and simply replacing the motherboard has only helped a twice, when i cleaned it up it worked.

That sounds reasonable. I still have some Tweek. I'll give that a try. It worked with the same kinds of problems on computer sockets.

Okay. You are on the right track. When I went back to the phone, I actually got two taps out of the screen, which it hasn't done in a long, long time. (I was running keyboard only for a long time before I could take it down to fix it.) I attribute that to just disturbing the contacts with so many assembly/disassembly efforts.
After I applied Tweek to the joints, it ran well.... for about an hour. Trying again was no luck, so I don't think I'm going to mess with the contacts anymore. By the time you figure how infrequently motherboards come up for sale and the cost, I think I'd do just as well with a trade in on a flat-rate repair.
But at least now we know for the record that there is another cause of dead touch screens.

well i have about 13 motherboards, if your interested let me know

Thanks. What has been your experience with changing motherboards?
The reason I ask is because the service manual wants the phone to be tuned again after a motherboard swap. I see a lot of people changing motherboards, and I can't believe that is much of a problem when you don't see anyone complaining about the phone not working well afterwards.
A spare motherboard might be a good idea for a diagnostic tool. It would have saved me a lot of work changing the touch panel and cables if I would have had a motherboard to try first.
I thought I had a good spare in a damaged phone, but when I took it out the other day to test this phone, I found out it had physical damage too. The SIM holder and RF shielding were dented, but the killer was that the daughterboard cable connector was bent.
I suppose back when the phones were $900 you might try to fix something like that, but it's hard enough to do a connector swap on a computer motherboard. I can't imagine that even the factory has the equipment to properly swap the connector even if you can get the part.
How much do you want for a motherboard? On that famous auction site I've seen them go for around $10 to $30. I could kick myself for not buying the last one I saw at $7 because I thought I had a spare.

[Q] HTC One M7 Touchscreen Doesn't Work Partially On the NEW SCREEN

Hello guys! Saddly for me my touchscreen stopped working but the thing is that i bought a new screen assembly but i still have the same problem and the same spot doesnt work (on the digitzer, lcd works perfectly). I really dont know what to do i have tried to google my problem but people always solve there problem by replacing the screen and i did the samething and still nothing. I'm running the latest stock rom from at&t now but i have tried to flash viper rom and cleamrom, etc... but i have gotten the same result
i tought that it could be the digitzer connector on the motherboard but it looks new so i cant find the problem...
To be more specific the spot thats shown on the image does work but when i touch it, it shows that iam using 2 fingers when iam only using 1 its really anoying when i use the keyboard. When i touch that spot, the phone starts to select things arround the "dead" spot.
My apologies if i have made some dumb mistakes in the text, i'm from belgium so english isnt my mother laguage.

IF theres no liquid damage.
The phone was working just fine, then mysteriously stopped working in one spot. I would guess replace digitizer (aka glass) But if replacing glass has yielded the same result. Now it gets tricky. Now its either a board level issue or a problem with the Kernel interfacing with its hardware.
Since not a stock device and has been rooted with custom ROM its possible those software mods might have affected it.
My suggestion is do your best to go back to completely stock and hope for the best.

IAmSixNine said:
IF theres no liquid damage.
The phone was working just fine, then mysteriously stopped working in one spot. I would guess replace digitizer (aka glass) But if replacing glass has yielded the same result. Now it gets tricky. Now its either a board level issue or a problem with the Kernel interfacing with its hardware.
Since not a stock device and has been rooted with custom ROM its possible those software mods might have affected it.
My suggestion is do your best to go back to completely stock and hope for the best.
Click to expand...
Click to collapse
Thanks but iam already on stock i have used RUU to reset the phone, same result. And liqued damage is possible any idea what would help?
Or is it possible that the connector on the board is broken?

As you start to eliminate your possibilities the fixes become more difficult.
If your back on stock everything and still bad then its going back to board level stuff. Meaning the connector on the board or something along those lines.
If thats the case then the fix is near impossible.
Might want to get a good strong magnifying glass out and see what you can find.

IAmSixNine said:
As you start to eliminate your possibilities the fixes become more difficult.
If your back on stock everything and still bad then its going back to board level stuff. Meaning the connector on the board or something along those lines.
If thats the case then the fix is near impossible.
Might want to get a good strong magnifying glass out and see what you can find.
Click to expand...
Click to collapse
ok i will see what i can find, and thanks for your assistance.

Did you ever find out what it was?
My HTC One has a 1/4" section that doesn't respond to touch at all.

Hi
I have the same problem in my HTC ONE E9 PLUS where a longitudinal line along the screen does not respond. Does anybody find a solution for that please?

Davideoo said:
Hi
I have the same problem in my HTC ONE E9 PLUS where a longitudinal line along the screen does not respond. Does anybody find a solution for that please?
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Click to collapse
Most likely a faulty digitizer, replace your lcd assy.

Huawei P9 thinks the smart flip case is always on.

Hi not many posts as always been a lurker. I recently changed 2 lcd's on 2 different phones. 1st one went fine, but the second on is just showing as if it has a smart case on it at all times meaning cant access the phones features. Tried a couple of troubleshooting steps but still no avail.
1. Different LCD on phone - still same fault
2. Removed proximity sensor - still same fault
3. tried darkening proximity let through on the glass - still same fault
4. Factory reset and cleared cache - still same fault
The customer did say this was playing up once she had broken the screen but though id tap into you experts knowledge to see if you had come across this before or what could i do to remedies this.
If i posted in wrong area appologies please advise where to post!
Many Thanks
Eddie

As far as I know, it senses magnetic fields in order to determine whether the cover is on or not.
I wouldn't think the magnetic sensor is in the screen, which it also doesn't appear to be.
I would look into troubleshooting there instead. Maybe try "resetting" it by putting a strong magnet to it? At your own risk, of course, though I wouldn't expect much to happen.
Replacing the sensor might be the only way out, and it's probably soldered to the board.

Foscot thanks for your reply, will look into this and see if i can get some results. Will post to confirm.

Foscot said:
As far as I know, it senses magnetic fields in order to determine whether the cover is on or not.
I wouldn't think the magnetic sensor is in the screen, which it also doesn't appear to be.
I would look into troubleshooting there instead. Maybe try "resetting" it by putting a strong magnet to it? At your own risk, of course, though I wouldn't expect much to happen.
Replacing the sensor might be the only way out, and it's probably soldered to the board.
Click to expand...
Click to collapse
Hi Foscot, a few updates, i noticed the liquid indicator is red so it seems that some damaged must of been caused there, mostly at the bottom of the handset. I cleaned with alcohol and the handset come to light and was working with full screen but then went back to its flip case state. i am thinking maybe changing the sub pba (if i can find one)
Thanks for your help
Will post updates.

lyncomm said:
Hi Foscot, a few updates, i noticed the liquid indicator is red so it seems that some damaged must of been caused there, mostly at the bottom of the handset. I cleaned with alcohol and the handset come to light and was working with full screen but then went back to its flip case state. i am thinking maybe changing the sub pba (if i can find one)
Thanks for your help
Will post updates.
Click to expand...
Click to collapse
Makes a lot of sense. Water shorted out the magnetic field sensor, which has caused it to always sense the flip case. New PBA is likely the only fix.
Make sure to keep me updated, it's quite interesting

Foscot said:
Makes a lot of sense. Water shorted out the magnetic field sensor, which has caused it to always sense the flip case. New PBA is likely the only fix.
Make sure to keep me updated, it's quite interesting
Click to expand...
Click to collapse
All good it seems, i doused in alcohol and gave it a good clean and charged over night now 100% battery with no flip case problem! sensor must be sorted ! going to give back to customer and hopefully all stays well. Many thanks for your help!

Hi. Interesting post. Can you tell me which part of the phone you cleaned with alcohol? Have the same problem with my p9 plus which thinks the flip case is on. Disassembled much of the phone and tried to clean it with paper and alcohohol but with no result. Also tried putting a magnet near the phone.

Update. Disassembled the phone and cleaned all the parts on the lower side of the phone including the board and now it works again.

Found a Midnight OnePlus 3T on Craigslist for $10! The issues are...

Hey guys,
So I've personally owned this device before and sold it, however, luckily I was looking about on Craigslist and managed to run into a post where this lady was selling her Midnight 128gb OP3T for $10 due to the wifi not working. The phone is literally spanking new and the only thing I can think of is water damage. She said the wifi suddenly stopped working and spoke with OnePlus Tech support and wasn't going to pay $275 to fix it so she just wanted it gone. So I figured whats there to lose, right? I went home performed a factory reset on the phone and the wifi actually was working. Then I realized it's intermittently working. I found that out because after sometime it suddenly disables itself and I have to sleep the device for like two minutes and it'll kick back on. The proximity sensor is also dead too. I did the *#808# to test the sensor and nothing is generated. These are the only real issues this phone has. The loud speaker also sounds a bit off... I'm sure I could easily replace that too.. It could just be me. I've posted the snapshot of the proximity sensor test. The wifi was currently working when I took that snapshot and like I said it's a hit or miss.
I haven't gotten into the device just yet, however, I'm planning to check the water damage sticker once I do as that is my suspicion. I'm waiting on my tool set I ordered on Amazon at the moment. My question is, do you think replacing the wifi antenna cable will fix the wifi connectivity issue? The phone is currently on 8.0 Oreo and I haven't tried performing a complete reset/restore so I'm not sure that could be a fix. Also the phone doesn't get too hot and usually with water damaged devices the phone typically overheats pretty fast due to corrosion. I guess I'll find out after I open the device, but for now do you guys have any other suggestions? I've heard of the whole IPv6 intermittent wifi issues and can assure I have IPv6 disabled.
Thanks for taking the time to read my question!

The WIFI thing isn't something I think you can just replace, I think you would just need to replace the board right?

Yes, you would need to replace the mainboard of the phone. However 10$ is quite cheap for a spare screen and midnight black metal casing. Just find a cheap 3T with broken screen and switch mainboard with that one and you have a working phone. [emoji16]

Before doing that, check the phone's board and look for corrosion. If you find any, try cleaning it up gently, with some alcohol and if you manage to get it all cleaned up, try testing it again to see if it solves the problem.

If you get the schematic for this device and have a boardview program you could find the wifi circuitry..... it is more than likely some short to ground due to the fact that you are feeling heat.... due to liquid damage or not. Sometimes changing a small component can fix the issue but you need a microscope, heat gun, solder pencil, etc......