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Screen is blank but touch screen works ***HELP***

I recently got a touch pro of a friend with a damaged screen that didn't turn on but the touch screen was responsive. Apparently he sat on it and the screen broke.
I then acquired it and replaced the LCD screen and i turned it on but all it shows is a blank black screen with the backlight on. I was tapping while it booted up and it was making that beep noise so i know the touch screen works. What do i do now.

dazz245 said:
I recently got a touch pro of a friend with a damaged screen that didn't turn on but the touch screen was responsive. Apparently he sat on it and the screen broke.
I then acquired it and replaced the screen (with digitalizer) and i turned it on but all it shows is a blank black screen. I was tapping while it booted up and it was making that beep noise so i know the touch screen works. What do i do now.
Click to expand...
Click to collapse
if the lcd is damaged and you only replaced the digitizer then that wont solve the problem, the digitizer just sits ontop of the lcd and recognizes your touches, hence why it mite know that your touching the screen but the screen is still blank

mancsoulja said:
if the lcd is damaged and you only replaced the digitizer then that wont solve the problem, the digitizer just sits ontop of the lcd and recognizes your touches, hence why it mite know that your touching the screen but the screen is still blank
Click to expand...
Click to collapse
I replaced the LCD along with the digitalizer. Tats what i meant.

Sounds like either the new screen is inop on fit (fraid you need another to test, then send the first back as faulty), or the fault is not the LCD itself.
Possibily its the wrong screen, or its not installed correctly, or you damaged either the screen or the controller when installing.
I'm afraid you dont have many options - take it apart & rebuild to ensure correct parts & fitment, spend £££ on alternative parts to see whats broken (or serious £££ on test equipment!), send it off for repair or give up!
I'd go for option 1 first
If your friend sat on it hard enough to break the screen, i'd be looking for any damage / cracking to the boards / ribon cable mounts and be looking very carefully at the mountings of any IC chips. Incedently, when (s)he sat on it, did the screen work at all? and was it 100% working before they did?

Okay thanks for the replies. I just bought a flex cable where the slider thing is because the old one looked a bit old and flexed out and on inspection of the old screen i found a tiny rip on the screen's flex cable too. I wait for my cable and see if it works and if it doesn't then i'll sent the screen back as faulty and get a new one and if that doesn't work then I'll give up and sell it again

hi
sorry to wake up an old thread.
so what's your solution/conclusion?
is it the flex, or the LCD that broke?
i have the same problem right now.
thanks

was mainboard

FUZE keypad backlight and LCD backlight problem. Please help...

New Problem :
Please see post #10.
Old Problem ( solved ) :
Hello,
I had told my problem in this thread but got no response so had to create a new thread to see if someone helps.
My problem ( I mean my fuze's ) is :
Firstly my fuze was having few scratches and the digitizer was broken lil in the edge/corner so I thought to replace its digitizer.
Brought new digitizer ( 2 months back ), disassembled the device and while removing the flex cable, broked its buttons strip ( volume and ptt button ) and while removing/separating lcd from digitizer, I destroyed both!
So next I brought new lcd and flex cable. Stupid seller sent touch pro flex cable instead of fuze. Had it return it and the fuze flex cable is on way now.
In the meanwhile, I tried to install new lcd+digitizer and damaged flex cable but I'm getting only backlight and no display/image. Sometimes I get thin RGB/rainbow vertical lines and once or twice I got the display/image too. As the adhesive conductive tapes/fabric/stickers got weaker I brought new copper conductive tape ( Like this ) and sticked them but still I'm not getting display/image and only backlight.
I'm very fedup and stressed about this although spent 100$ and Due to this, I able to cook roms and I'm out of xda dev since 2 - 3 months :'(
If someone could help, you will be greatly appreciated. Please please help!
I don't have money to buy new device either and have no mobile phones to play with since from fuze is dead.
Thanks a lot in advance....
Best Regards

I replaced the lcd in my phone and had the same problem. I later discovered that I didn't have the ribbon connector in all the way. I hope this helps.

you need a working flex cable...the same thing happened with but on a nokia n95...the blacklight was comin but no display changing the flex helped

Cingularman said:
I replaced the lcd in my phone and had the same problem. I later discovered that I didn't have the ribbon connector in all the way. I hope this helps.
Click to expand...
Click to collapse
I'm not a mobile tech.., could you please let me know what/which is a ribbon connector?
Thanks for the help though.
djteotancolis said:
you need a working flex cable...the same thing happened with but on a nokia n95...the blacklight was comin but no display changing the flex helped
Click to expand...
Click to collapse
But had it working once and twice. However, I will get new flex cable in few days.
BTW; I had also tried the new touch pro flex cable and had same issue.
Thanks for the help though.
Best Regards

CRACING said:
I'm getting only backlight and no display/image
Click to expand...
Click to collapse
Hi
I had the same problem last night (wasted 3 hours). Just replaced my LCD as well, broke digitizer was a problem. Anyway, after taking a phone a part 3 time figure out what the problem was.. The two ribbon cables have to touch (mostly likely a ground).. The LCD one and log flex one.. I will try to find you a picture..
Now I have a different problem, can't align the screen properly. The right side on screen is way off.. What a mess..

Green

sadik007 said:
Hi
I had the same problem last night (wasted 3 hours). Just replaced my LCD as well, broke digitizer was a problem. Anyway, after taking a phone a part 3 time figure out what the problem was.. The two ribbon cables have to touch (mostly likely a ground).. The LCD one and log flex one.. I will try to find you a picture..
Now I have a different problem, can't align the screen properly. The right side on screen is way off.. What a mess..
Click to expand...
Click to collapse
sadik007 said:
Green
Click to expand...
Click to collapse
I tried everything but didn't got it working. Though I have doubt on original flex cable that I broken while removing.
I have trouble with getting new flex cable on ebay. First the seller sent wrong flex cable ( TP's which it doesn't fit for fuze ), 2nd time the flex cable lost in shipment and 3rd the seller didn't had stock to resend so refunded.
Now I have brought the flex cable from different seller and its about 14 days and not yet received.
When I tried touch pro flex cable I didn't get the display but only backlight but once or twice I saw the display so I think it was something wrong in my connect. However I didn't had much time to test the device using touch pro flex cable because I had to return it!
This is what I'm playing with my device since 4+ months. Mostly waiting waiting waiting......
Thanks...
Best Regards

I can see that ribbon hold contact.

obaz said:
I can see that ribbon hold contact.
Click to expand...
Click to collapse
The ribbon aka conductive tape/sticker I have is no longer usable. Its adhesive gum is too weak and no longer sticks. I have searched lot to find such conductive tape/sticker and found copper conductive tape/sticker. Using it now.
@sadik007 and all
I got the flex cable today and after testing, I' getting same problem. No display but only backlight. I see some minor rainbow lines which haven't saw before but as said, I checked the grounding and everything seems correct.
Fed up of this and desired to sell it as parts or repairable...
Best Regards

Finally my fuze is back alive.
Got Correct Flex cable and new LCD. Now its working perfectly.
However, a minor problem if anyone can help.
The brightness setting of LCD in settings -> System -> Power -> Backlight seems to work only till 40% and then after it doesn't increase the brightness of the lcd.
In auto mode, its same. I think the brightness is working only upto 40% and then it doesn't increase.
Cannot understand whats but I guess its because the seller gave me diamond lcd instead of touch pro/fuze. As I can see, diamond lcd doesn't have variable resistor and my friend say its a brightness setting.
But the hardware setting should be atleast full and we could decrease through software.
Can body help me how to solve this problem? I guess its not possible.
P.s the brightness from 0% to 40% is not bad to use but may have trouble in sunlight.
Thanks a lot for all your helps...
Best Regards
p.s My problem is something like this but the backlight is working fine.
Edit;
I don't think my FUZE stops giving troubles. New problem started since last night and today.
As the backlight was lil dim on sun light, I went to try Lumos app. Didn't saw any difference, just sucked at 40%
Today when I booted my fuze morning, it started to do some malfunction in LED lights ( LCD backlight and front penal keypad backlight light ). Backlight of keypad is no longer working when pressed its button but buttons work fine. And also if I slide out the hw keyboard, the home button backlight turns ON. and also the d pad circular light and back button backlight.
Cannot under stand what the hell is going on. If I get any SMS or EMail, d pad circular light rounds fine but if I connect USB to charge, d pad circular light doesn't work.
I removed the Lumos app, softrebooted, hardrebooted, and reflashed but still same problem.
Any idea?
I guess I'm stupid or the device is fooling me.
Thanks again...
Best Regards

Bump...
I don't think my FUZE stops giving troubles. New problem started since last night and today.
As the backlight was lil dim on sun light, I went to try Lumos app. Didn't saw any difference, just sucked at 40%
Today when I booted my fuze morning, it started to do some malfunction in LED lights ( LCD backlight and front penal keypad backlight light ). Backlight of keypad is no longer working when pressed its button but buttons work fine. And also if I slide out the hw keyboard, the home button backlight turns ON. and also the d pad circular light and back button backlight.
Cannot under stand what the hell is going on. If I get any SMS or EMail, d pad circular light rounds fine but if I connect USB to charge, d pad circular light doesn't work.
I removed the Lumos app, softrebooted, hardrebooted, and reflashed but still same problem.
Any idea?
I guess I'm stupid or the device is fooling me.
Thanks again...
Click to expand...
Click to collapse

Same problem.
Backlight setting changes only 1-4 interval and does not brighten 5 and more.
I had heard that problem one sells his tp which's lcd replaced.
Options:
1) while replacing, flex can be damaged. I do change screens for 6 years and hard to beleive it.
2) keypad membrance can be damaged while replacemnt of lcd. More harder than option 1.
3) eBay sellers sells fake lcd screen.
I handle over 5 diamond and tp screen far away and still keep some cracked ones. They all different from each other. Somehow there must be different versions of these lcd's.

By the way I also tried a diaond lcd and it gives same error.
first 4 step is ok but no more 5 to 10 steps working.

Problem was solved:
HTC P3700 LCD and P4600-T7272-touch Pro LCD screens are different.
here is the differences illustrated on photos:

@sokomind
nice find. Yeah I do see the changes from touch pro lcd and diamond lcd. touch pro lcd has 10 led levels and diamond has only 5.
Part No :
Diamond LCD with 5 LED brightness levels : 60H00130-00M
Touch Pro LCD with 10 LED brightness levels : 60H00129-00M
29 is what we need for Touch Pro but in ebay sellers don't know the difference of these lcds. They ship what ever stock they have. I had requested to send Touch Pro LCD and also said the part no but they sent the diamond LCD.
Damaged 3 times in shipping and when I got the working one, it was diamond lcd.
Anyways, now I'm using the device has a 3g data card and 3g router. Working g8.
Thanks...
Best Regards

I still have the problem as #"10 cracing.
I got a diamond lcd and then ordered a touch pro lcd.
Yes TP LCD is brighter but it is still working 4/10 on brightness. And then I see that my flex cable has lost one of the way. I try to fix it but it still give me 4/10. I do not know if it fixs a new flex. I do not want to spend $20 more.
Have you spare TP flex not fuze?

Screen backlight wont turn on

Hey,
I accidently dropped my phone in water a couple of days ago. The backlight doesnt work. Under a really bright light i can see the lock screen and it still functions. Is it possible to replace just the backlight? or what should i do? I dont believe this would be covered from motorola and I live in canada got the phone shipped from the states.
Any advice would be appreciated.
Thanks,
James

I'm guessing you might need a new screen/display. Perhaps do a search and find a repair place you can ship it and get an estimate? I know HTC offers such repairs dirctly (ship the phone, they call you with an estimate). I'd bet Moto does as well if you're not comfortable with 3rd party repair.

aznproto said:
Hey,
I accidently dropped my phone in water a couple of days ago. The backlight doesnt work. Under a really bright light i can see the lock screen and it still functions. Is it possible to replace just the backlight? or what should i do? I dont believe this would be covered from motorola and I live in canada got the phone shipped from the states.
Any advice would be appreciated.
Thanks,
James
Click to expand...
Click to collapse
I have the same problem right now except mine was not dropped in water. In a bright light I can see the lockscreen and also could see the emergency dialer tonight but the keyboard was not reacting on certain buttons either. One screen said to unlock enter your gmail account info,I tried to enter my name and the period symbol(.) was not working for me. I'm thinking maybe the LCD screen needs replaced or the ribbon cable,IDK. Any help is GREATLY appreciated.
Edit: Essentially I finally got logged into the phone and the keys were working fine,the screen was still dim so I turned the brightness all the way up and turned off automatic backlight. I replaced the LCD screen and digitizer and now the phone is not starting for me. I'm about to replace the Flex Ribbon Cable inside the phone and see if this corrects the problem. Right now i cant get the phone to start up so I'm thinking the ribbon cable is disconnected somewhere because it hooks to the motherboard and the LCD or the motherboard is fried. IDK,I'll let everybody know what happens with this project.

lcd not working
PS3AndroidHacker said:
I have the same problem right now except mine was not dropped in water. In a bright light I can see the lockscreen and also could see the emergency dialer tonight but the keyboard was not reacting on certain buttons either. One screen said to unlock enter your gmail account info,I tried to enter my name and the period symbol(.) was not working for me. I'm thinking maybe the LCD screen needs replaced or the ribbon cable,IDK. Any help is GREATLY appreciated.
Edit: Essentially I finally got logged into the phone and the keys were working fine,the screen was still dim so I turned the brightness all the way up and turned off automatic backlight. I replaced the LCD screen and digitizer and now the phone is not starting for me. I'm about to replace the Flex Ribbon Cable inside the phone and see if this corrects the problem. Right now i cant get the phone to start up so I'm thinking the ribbon cable is disconnected somewhere because it hooks to the motherboard and the LCD or the motherboard is fried. IDK,I'll let everybody know what happens with this project.
Click to expand...
Click to collapse
What happen to letting everyone know? Were you ever able to get it going? Was it the flex cable? How did you get the LCD working.

Replaced the flex ribbon cable and it still didnt help anything. Guess its just the phone. I trashed the phone a while ago anyways and am currently running a rooted Droid 4
Sent from my DROID4 using xda premium

Automatic brightness problem

Touchscreen on my ds was replaced recently and everything worked fine except automatic brightness. When i turn automatic brightness on, it doesen't work, brightness stays on it's current level. When i lock the phone and unlock it again, brightness is on it's lowest level, so i have to set it manualy. Even when i am talking on the phone, screen is allways on and i need to press lock button to turn it off and again to turn it on after call ends. I think that touchscreen wasn't placed well, and brightness sensor can't work because of it.
What do you people think?

Yeah, it sounds like the light meter and proximity sensor weren't connected properly when the new digitizer was fitted.. although I'm pretty sure they are connected via the same ribbon cable that the digitizer part is connected with. Maybe the new digitizer doesn't actually have a light meter and proximity sensor?
Did you get it replaced at a shop or did you do it yourself?
I am awaiting the arrival of a new digitizer to fit to my Desire S as a matter of fact!
EDIT: actually I see that the light meter and proximity sensor don't seem to be part of the digitizer. So either they are not connected properly, or they are obscured. It might be useful to check the sensor values with the app AndroSensor.

raymosaurus said:
Yeah, it sounds like the light meter and proximity sensor weren't connected properly when the new digitizer was fitted.. although I'm pretty sure they are connected via the same ribbon cable that the digitizer part is connected with. Maybe the new digitizer doesn't actually have a light meter and proximity sensor?
Did you get it replaced at a shop or did you do it yourself?
I am awaiting the arrival of a new digitizer to fit to my Desire S as a matter of fact!
Click to expand...
Click to collapse
The light meter and proximity sensor aren't part of the touchscreen (I am fairly sure having replaced mine twice). The most likely cause of this is that the double-sided sticky tape which holds the LCD and the digitizer together has been put in the wrong place and has obscured the sensors. Take it apart again, making sure to use a hair-dryer or similar to free the double-sided tape first, and re-assemble carefully. Edit: Proximity Sensor Flex Cable Ribbon For HTC Desire S G12 S510e the sensor is definitely a separate component, may be loose after the rebuild.
Have a look at the Desire S teardown video if you need guidance.

raymosaurus said:
Did you get it replaced at a shop or did you do it yourself?
EDIT: actually I see that the light meter and proximity sensor don't seem to be part of the digitizer. So either they are not connected properly, or they are obscured. It might be useful to check the sensor values with the app AndroSensor.
Click to expand...
Click to collapse
I 've replaced it in the shop. Androsensor shows waiting for event for light and proximity.
SimonTS said:
The light meter and proximity sensor aren't part of the touchscreen (I am fairly sure having replaced mine twice). The most likely cause of this is that the double-sided sticky tape which holds the LCD and the digitizer together has been put in the wrong place and has obscured the sensors. Take it apart again, making sure to use a hair-dryer or similar to free the double-sided tape first, and re-assemble carefully. Edit: Proximity Sensor Flex Cable Ribbon For HTC Desire S G12 S510e the sensor is definitely a separate component, may be loose after the rebuild.
Have a look at the Desire S teardown video if you need guidance.
Click to expand...
Click to collapse
This is my third touchscreen. First (original) one was damaged after replacing lcd, second had damaged digitizer and this one works but looks like it was putted wrong.
I can't repear my phone, cuz i don't have proper tools to do it
I ll bring phone to shop to take out and put back touchscreen, and hopefully it will work.
Sent from my HTC Desire S using xda app-developers app

Problem with the backlight

Hi! Two days ago, my phone dropped in water , i put them immediately in rice until today. When start it with the power button, i felt the vibration and i hear the open sound. But the screen remains black... but i discover that it was just the backlight because when i watch the screen under a lamp i can see the interface and slide between pages... but its very dark. Is it possible to change this backlight? or just wait few other days to allow time to dry fully. I welcome your suggestions! thanks

samnup said:
Hi! Two days ago, my phone dropped in water , i put them immediately in rice until today. When start it with the power button, i felt the vibration and i hear the open sound. But the screen remains black... but i discover that it was just the backlight because when i watch the screen under a lamp i can see the interface and slide between pages... but its very dark. Is it possible to change this backlight? or just wait few other days to allow time to dry fully. I welcome your suggestions! thanks
Click to expand...
Click to collapse
When there's water involved, IT's hard to know exactly what damaged. Could be just stain on the ribbon connectors, a burned fuse/diode/resistor (all of them micro sized) etc.. or just the LCD's backlight damaged entirely.
Keep it on rice for more time. I would make the battery to discharge to 0%, But it's also more recommended to keep the phone OFF. Only my friend LUCK knows.
To change the backlight, the whole screen needs to be changed.

Backlight died on me. Possible moisture.
First, it was on boot loop (on stock rom)
i went to restart it (holding power button and volume down)
then the screen turned bright white, restarted it and then the backlight died, dismantled the phone, now still in rice, also happened on 2nd April.
Any help is greatly appreciated.
Sherman Han.

Problem Solved.
coly37 said:
First, it was on boot loop (on stock rom)
i went to restart it (holding power button and volume down)
then the screen turned bright white, restarted it and then the backlight died, dismantled the phone, now still in rice, also happened on 2nd April.
Any help is greatly appreciated.
Sherman Han.
Click to expand...
Click to collapse
Took it apart down to the Screen (not the screen layers), left it in rice, works like a brand new now. Cheers.

I just replace all the frame and lcd for a new on my nexus 5, but the problem was still there... no backlight, i can see a little bit the screen, but it's very dark... do you have any idea for try to repair this, because now i don't think that it's the screen but more a motherboard or power problem for the backlight :S

exactly same problem here
nexus 5 phone dropped in water.
Backlight went out permanently - rice didn´t help.
Can see the display working using a flashlight - so rest of the phone seems to be working ok.
Just pruchased a new screen, put it all in and still the same problem: display works, touch works, backlight is off.
So it seems the backlight part of the display receives no power - anybody has an idea how to fix that?
thanks

I have answer to this!
I have had this problem like 3 months now and i finally fixed it.
Basically what i did was that i bought a broken nexus 5 (only the screen glass was broken) and tried to swap every part one by one. The one that was not working was the main dock!
It is a cheap fix, like 10£ on Ebay.
I am writing this post because anyone else haven't.
I hope that someone sees this.
I now copy this message to all other threads so people can fix their nexus 5's
PS:as you can probably tell English isn't my first language.

Hello! I am having the same problem. The cell phone fell to the floor and the next day the problem began. The display is not broken.
What are you taking about when you say "main dock"? Motherboard aka mainboard?
Thanks!