Develop Bugs

Strange Desire with yellow lcd display

Hi!
I have a strange problem with one desire...
After changing the broken lcd screen, the display is very yellowish, everything witch was "white colour", is now yellow...
I have tested 4 lcd-s, changed the rom (multiple ROM-s), but same result...
Strange is even when i try to make color correction with Calibrator (calibrated-signed-42-Universal)... i can change red and green, but changing blue is not working to obtaining "white"...so it remain the same color with values (for blue) from 0 untill 1000.
Is there an another program to make color correction, or is a hardwere fault?
Any ideas?
Thanks

How exactly are you changing the "lcd"
There are two types of screen that the desire can use (depending on your model) amoLED (led!) or SLCD (super lcd). So unless you replace your screen with the correct replacement type for your specific handset your going to have strange issues.

Maybe you should take a very close look at your display, with a magnifying glass or a microscope and check if the blue sub-pixels work at all. It seems as if they don't work and you get amber colors.

I have received the phone with broken display, after power on, it was dark screen no display...so obviously i changed the lcd with the same model, wich is a Samsung (AMOLED i think), P/N: 60H00287-00.

I'm pretty sure it's the correct type of display if anything is being displayed. The problem might be the connection between the mainboard and the screen. Perhaps you've accidentally damaged it when changing the screen? Maybe you should post some pictures of your assembly showing the connection. That might let someone see the problem and suggest a solution.

if you need to understand better the problem i can upload some photos of the Desire...

The assembly is correct, i checked it, i think it`s a micro crack on the mainboard, suffered during the shock, so i will resolder the contacts... i will keep u updated...
meanwhile, i wait other opinions also..

I have found the problem...It was the filter near the lcd connctor...they are 3 filters...for each color...RGB...so after resoldering all of them, and 6 hours of work...it`s working...

Amokh said:
I have found the problem...It was the filter near the lcd connctor...they are 3 filters...for each color...RGB...so after resoldering all of them, and 6 hours of work...it`s working...
Click to expand...
Click to collapse
nice, hasn't taken you too long to identify it really either.

Amokh said:
I have found the problem...It was the filter near the lcd connctor...they are 3 filters...for each color...RGB...so after resoldering all of them, and 6 hours of work...it`s working...
Click to expand...
Click to collapse
I have the same problem as you, is it possible to post instruction and a picture .
I would like to fix the problem and don't know how.
Best Regards

Display stay white after touch screen substitution

Hallo to all!
i've already tryied to search this topic in all the forum, but didn't find anything...pls tell me if something similar already exists!
so my problem: i have a touch pro 2 (RHOD100), and the last week i broke the touch screen (due to accidental heavy pression on it)...all works, but no TS function...
so (here starts my trouble) i decide to change by myself...i bought a new one (only TS) on ebay and make the change....
no problem with the hardware change, but now my display stay white...
some consideration:
- OS start with no problem (start sound and button sound)
- all flats are plugged correctly (checked many times)
- the backlight of the lcd works well (low light after some time)
some help? maybe i forget something important?
thanks a lot in advance to any helpers!!

db491 said:
Hallo to all!
i've already tryied to search this topic in all the forum, but didn't find anything...pls tell me if something similar already exists!
so my problem: i have a touch pro 2 (RHOD100), and the last week i broke the touch screen (due to accidental heavy pression on it)...all works, but no TS function...
so (here starts my trouble) i decide to change by myself...i bought a new one (only TS) on ebay and make the change....
no problem with the hardware change, but now my display stay white...
some consideration:
- OS start with no problem (start sound and button sound)
- all flats are plugged correctly (checked many times)
- the backlight of the lcd works well (low light after some time)
some help? maybe i forget something important?
thanks a lot in advance to any helpers!!
Click to expand...
Click to collapse
When you changed the touch screen did you remove the flex cable that connects the upper half of the phone to the motherboard? Are you sure you didn't break the LCD screen itself?

hallo,
yes i remove the flat, and plug back again where changed - when i press on the TS (with white screen) i can ear the "tap"
i cannot be sure, but it light on...i think is enought...or not?
thanks for you're help!

db491 said:
hallo,
yes i remove the flat, and plug back again where changed - when i press on the TS (with white screen) i can ear the "tap"
i cannot be sure, but it light on...i think is enought...or not?
thanks for you're help!
Click to expand...
Click to collapse
It looks like like either the flex cable got damaged or it's not plugged right. It could also be the LCD flex, where lcd plugs into the small connectors under the four buttons at the bottom of the touch screen not being connected properly. Did you lift the small levers where the flex cables go into the mother board or where the lcd/touch screen gets plugged in or did you just push them in?

i lift the lever where pull out the flex, and pull it down when restore the connection... and i'm almost sure about connection, also because them are so "stricted" in the plug himself...
but i find really strange that the lcd is on (completely white), you don't think so?
also if it is damaged, should be not white...or maybe, as you say, a flat problem?
this evening i will re-open it for a check...i don't know what else do...
maybe i will try to buy a complete kit (TS+lcd)...
i will surely let you know

db491 said:
i lift the lever where pull out the flex, and pull it down when restore the connection... and i'm almost sure about connection, also because them are so "stricted" in the plug himself...
but i find really strange that the lcd is on (completely white), you don't think so?
also if it is damaged, should be not white...or maybe, as you say, a flat problem?
this evening i will re-open it for a check...i don't know what else do...
maybe i will try to buy a complete kit (TS+lcd)...
i will surely let you know
Click to expand...
Click to collapse
The screen being white, means it's receiving power but not video signal. There coud be different reasons for that. It happened to me couple of times. What I did was lift the connector lever, pull the flex connector out (where it connects to the motherboard) just a tiny bit and secure the connector with the lever and it worked. If the flex cable is going bad it could be that just one line or two are going bad not the whole thing, thus still delivering power but not video signal.
If your problem is with the flex buying a new screen/digitizer will not fix it. When you screen is white does it go out if you slide out the keyboard?

hallo,
sorry for late answer,
i make some test with flat, but the result is the same...
the screen always stay white, but i can ear the start sound, the pression sound, etc...so it seems it's just the lcd...
maybe i can try to buy a complete set lcd+ts?
thanks for answer

db491 said:
hallo,
sorry for late answer,
i make some test with flat, but the result is the same...
the screen always stay white, but i can ear the start sound, the pression sound, etc...so it seems it's just the lcd...
maybe i can try to buy a complete set lcd+ts?
thanks for answer
Click to expand...
Click to collapse
I could be wrong, but I think it's the flex cable that is bad not the LCD screen itself. The flex cable has several small thin lines, what is happening is the power is getting to the LCD screen but the video signal is not, so most probably one of teh video signal lines is broken.

[Q] Xperia play noob

HTML:
First time poster in the forum here. Basically I opened up my xperia play to replace the screen which was successful.
Unfortunately there was a spec underneath the screen bothering the hell out of me and so I took it apart again to clean it.
This time however once I put it back together it won't boot up and the only signs of life are a red flashing light.
I have tried swapping batteries and sockets. Still no change.
I hope there is a genius out there who knows the solution to me being a perfectionist.
Cheers.

You need to make sure all the connections are intact:
-the connection between the screen and the motherboard on the top right
-the small connection between the gamepad and the motherboard
-the flex (main) cable between each half of the phone, you have to press the motherboard down into the connector and hear a "click" to snap it in place

eksasol said:
You need to make sure all the connections are intact:
-the connection between the screen and the motherboard on the top right
-the small connection between the gamepad and the motherboard
-the flex (main) cable between each half of the phone, you have to press the motherboard down into the connector and hear a "click" to snap it in place
Click to expand...
Click to collapse
It was the motherboard hadnt got that click this time round. Unfortunately i think i have done something to the digitizer as the screen isnt responding to touch now.
The phone is destined for the bin unless there is a way to unlock the screen without the side swipe, as i only use for emulating.
Cheers for the previous help

[Q] LG D855 motherboard

hello, i have problems with g3. Screen is replaced it is working but the backlight is not working. Its very dark but can see something on screen. So maybe someone know there is problem with motherboard or someone have motherboard scheme?

Damaged lg g3 D855 screen backlight
Am having that same problem with my LG g3 D855. Can someone please help. The phone comes on but the screen backlights won't work is there a way for it to be fixed?

Have you made sure that all connections where correct when you changed the screen?
Sent from my phone

ypsmav said:
Have you made sure that all connections where correct when you changed the screen?
Sent from my phone
Click to expand...
Click to collapse
All the connections are correct....and the phone comes on just the display backlight not coming on.
The funny thing is that when am in a well lighted room or i shine a light on it, i can see that the phone is on an i can access my apps.

make sure that all 4 ribbons in the lg motherboard is properly connected, check if some pins are dent or bended. if all seems to be good, the problem is the backlight of your replaced screen

Make sure there is nothing covering the proximity sensor!

morloonie said:
make sure that all 4 ribbons in the lg motherboard is properly connected, check if some pins are dent or bended. if all seems to be good, the problem is the backlight of your replaced screen
Click to expand...
Click to collapse
where can i find the connection for the backlight?

Hello, did you find a solution.
I have the same issue, it's not the screen because when I change the motherboard, the brightness work.
Thank you.

Screen Problem

A friend of mine has a problem with his screen, see pics, it very strange and its somehow related to the SoM not the screen - I ve swapped the SoM for the one in my unit and the problem is cured on his unit but mine has it, I swapped them back and mine is fine but his has this problem.
It was on 5.1.1. and I ve tried several versions of 5.1.1. and several versions of 4.4.4. but I always get the same problem.
Any suggestions ?

Have I found the cause I wonder ? In the attached pic you can see a splodge of solder on what I m going to guess is the video output controller or something.

typos1 said:
Have I found the cause I wonder ? In the attached pic you can see a splodge of solder on what I m going to guess is the video output controller or something.
Click to expand...
Click to collapse
Who would carelessly drip solder into the unit? if it were to drip somewhere vital it would have fried or fry your car wires, even worse catch on fire.

alukarulz said:
Who would carelessly drip solder into the unit? if it were to drip somewhere vital it would have fried or fry your car wires, even worse catch on fire.
Click to expand...
Click to collapse
Theres no solder anywhere else and I dont think it dripped past the lid and the DVD player leaving no trace, I think someone was working on it for some reason or maybe bad quality control at the factory.

Did removing the solder splash resolve the issue?

marchnz said:
Did removing the solder splash resolve the issue?
Click to expand...
Click to collapse
Not done it yet, gonna try later . . .

I am interested too I've got the exact same problem. Pumpkin send me a new screen even though I've got no warranty anymore and the problem disappeared. Sadly this new screen is without a flex cable for the touchscreen so commands were not possible.

Draiden said:
I am interested too I've got the exact same problem. Pumpkin send me a new screen even though I've got no warranty anymore and the problem disappeared. Sadly this new screen is without a flex cable for the touchscreen so commands were not possible.
Click to expand...
Click to collapse
Yes, but the problem on my friend's unit is not screen related.
Why cant you use the cable from your old screen ?

typos1 said:
Yes, but the problem on my friend's unit is not screen related.
Why cant you use the cable from your old screen ?
Click to expand...
Click to collapse
Okay but screen issues are exactly the same.
The new screen has only one flex cable it's working but touch commands are not recognised. And the old screen has two flex cables.
Edit: I don't know if the new screen suffers the same problem because I had it running for only one minute and the screen issues are randomly.

marchnz said:
Did removing the solder splash resolve the issue?
Click to expand...
Click to collapse
Yes, it did !!
Half an hour of holding a soldering iron to a piece of copper braid and rubbing them over the solder/components covered in solder sorted it !
I used an iron that isnt quite hot enough to melt the solder used on these devices and it melted the solder splash easily, suggesting it was household solder or solder left by someone after the unit left the factory.
Still it was an excruciating half an hour - I thought all that heat my damage the SoM and maybe possibly remove components.

Draiden said:
Okay but screen issues are exactly the same.
The new screen has only one flex cable it's working but touch commands are not recognised. And the old screen has two flex cables.
Edit: I don't know if the new screen suffers the same problem because I had it running for only one minute and the screen issues are randomly.
Click to expand...
Click to collapse
Your old screen assembly is the screen + touchpanel. That is why there are two flexcables. One for the screen, one for the touchpanel. Your new screen assembly is the screen only.
You would have to move the touchpanel from the old to the new screen. However, that could be very difficult when the touchpanel surface is fully glued to the screen surface. If you're lucky the touchpanel is only attached along the edges. Then you might be able to remove it and stick it to the new screen.
Easiest way is to contact Pumpkin and ask them to send you the full assembly, so screen + attached touchpanel.

Mau2012sim said:
Your old screen assembly is the screen + touchpanel. That is why there are two flexcables. One for the screen, one for the touchpanel. Your new screen assembly is the screen only.
You would have to move the touchpanel from the old to the new screen. However, that could be very difficult when the touchpanel surface is fully glued to the screen surface. If you're lucky the touchpanel is only attached along the edges. Then you might be able to remove it and stick it to the new screen.
Easiest way is to contact Pumpkin and ask them to send you the full assembly, so screen + attached touchpanel.
Click to expand...
Click to collapse
Pumpkin are just sellers, it may be better to contact the factory direct, mighty be cheaper too.

Yes thanks for your answers