HTC Evo 3D wont turn on, but, getting charged - HTC EVO 3D

Hi there - I am wondering if I can get some help here.
I had an old working HTC Evo 3D and I use it as a spare phone during travel to use prepaid SIM cards. I wanted to change the complete housing of Evo 3d and purchased a front, middle & back frame from online OEM vendors. As a newbie, I was so excited and started to disassemble the phone and to put into the new housing. All went well till I started to take the LCD and digitizer from the old housing. I made a mistake and ripped the flex cable of the digitizer. I felt very bad and then I decided that I need to order a new digitizer online.
I continued to reassemble the phone with the new housing till I receive my new digitizer. I made sure that I kept the sticky tape in the front housing intact so its easy to take it again. I completed the assembling and when I turned on the phone the LCD was displaying white and black dots like grains. However, I could hear the HTC boot sound the “Quietly Brilliant” sound. At this point, I thought I have damaged the LCD too.
Today, I tired to switch again, I dont see the phone booting-up or hear the boot-up sound or see the white and black grain screen. When I charge the phone, I see the red LED light and then after some time it turns green. I tried all type of resets like power+volume buttons, power+camera button, long press power button. However, I dont think anything is happening.
Now, I am worried if the problem is now with the display or I damaged the motherboard. Does anyone know if the phone wont start if there is a damage to the LCD/digitzer? I am just waiting to know what might be the problem before ordering LCD/digitizer. I am unable to check which part is damaged now.
Thanks in advance!

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check to see if the ribbons are snugged in place.
mofoahh said:
check to see if the ribbons are snugged in place.
Click to expand...
Click to collapse
I agree take it apart and chech your work. I had problens with my camera and flash. It was tge connector not being fully seated
Sent from my Dell Streak using XDA App
Well, I just took off the rear cover and reseated all 3 connections, pushed em in as smoothly and far as they would go. But, same thing. Black screen. But the LED is still working...
I'm having the very same problem. This is my second replacement screen and neither displays anything except black screen with backlight on, and the home + settings + back buttons remain lit. I can hear my phone starting up and receiving messages, but I cannot see anything. I've taken the phone apart and put back together five times between two replacement screens.
Does anyone know what ribbon cable might be at fault for this particular issue? The largest ribbon cable was shipped bent across the circuit board on both screens; there is a permanent creese in both ribbon cables, but I'm not certain this is causing the issue.
Any insight or assistance with this issue would be greatly appreciated!

[Q] Replaced LCD flashing Red Light.. Comments?

Hey Everyone,
I have managed to destroy two Atrix's. The LCD was broken on the first then wifi/bluetooth just failed on the 2nd. While changing the LCD's I managed to crack the good one putting the phone back together.
I ordered a replacement from RepairsUniverse ($87.98CA) and it took two weeks to show up. I put the phone back together yesterday and I'm getting a flashing Green light. At first I thought the battery was completely drained so I left it for about an hour to charge. I would than get a flashing red light with a white flash in the middle than more red flashing. I'm sure it's telling me something here.
I did have the new LCD show an image but it was so dark that you could only see it if you reflected the light off the screen a certain way.
I have put the original LCD in and it will boot and show a picture (cracked obviously) so I don't know what the issue is with the new LCD. The part numbers on the cable are identical so I know it's the right piece.
What now? RMA or is there something else to try? Kind of pissed about it. I've been using a BB Curve 8530 and it's the biggest P.O.S. Can't stand BB since I made the switch to android

[Q] Help! broke scree

So dropped phone and screen went out. Replaced amoled and digitizer, device powered on and lit up home keys, but no display still. Replaced main board, in case video was out on board, but no joy. Any thoughts? No custom software or anything....
Maybe you didn't clip on the ribbon cables all the way. Or, just try pulling the battery and booting it again.
When I replace my screen, screen didn't work for first few boots.
ddochi11 said:
Maybe you didn't clip on the ribbon cables all the way. Or, just try pulling the battery and booting it again.
When I replace my screen, screen didn't work for first few boots.
Click to expand...
Click to collapse
I checked and checked, digitizer works, I can reboot and swipe unlock, adjust volume, but no screen. At this point I'm thinking bad LCD. Thoughts?
Thx for response and ideas though....
I bought a replacement but ut was a cheap fake, not an OEM screen. It went purple then black within 10 minutes. I got my money back (thank you PayPal) and made sure the next one was an OEM screen.
I hope you didn't spend too much on the repair parts. You can pick up a new Note for about $290 now.

White Lines across my smart phone screen

One morning I woke up and the bottom half of my Samsung galaxy avant (SM-G386T) had a grid of white lines going across it. First time I restarted my phone it went away.
But they keep coming back and now it's more permanent, Sometimes it goes away briefly but they come back. I tried factory resetting. That worked the first time for a few hours but then it came back. and I tried it again and 2nd time there white lines where there during the factory reset.
The lines even show when I turn the phone off and charge the phone. So I believe this means it is w hardware issue
I tried taking the back planel of the phone off. I disconnected and reconnected the lcd connector latch on the left side. But the problem still persists. I haven't pulled up the screen with a suction cup. So Idk if there is a cable that could be loose on the front end or not. But Idk want to go buy suctions cup if I dont need to you.
Should note that I do have a good sturdy rubber case on my phone. but it has hit the floor a few good times.
One other thing that seems to aggravate or sometimes even make the lines go away is putting my phone to sleep and waking it up repeatedly or adjusting my brightness to max.
What do you guys think? is this fixable or do I need to replace the lcd screen.
man its simple
just press the wires of display which are providing it power & ur problem will be gone.
Its due to lack of sufficient current to display!!
Rustamveer said:
man its simple
just press the wires of display which are providing it power & ur problem will be gone.
Its due to lack of sufficient current to display!!
Click to expand...
Click to collapse
What wires are you speaking of exactly. cause like I said I have taken the back off and disconnected and reconnected the LCD flex cable but nothing changed. Are there wires behind the LCD I need to get to? which means I need to removed the screen with a suction cup?

Replaced Screen Frame, Wont Turn on at all

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