Was trying to fix my phone, but messed it up even worse. I snapped the cable that connects the screen to the motherboard (that cable that goes through a slot). Is that the digitizer?
This thing: http://i.imgur.com/7YL5Fqr.jpg
That's the LCD connector. If you've mangled that cable beyond all doubt, then you need to replace the LCD. The Digitizer connects somewhere separately and is a lot smaller.
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My dumb butt child was sucking on my phone a couple weeks ago and caused the LCD to short out or something. The phone still worked and if I used a bright light I could shine it onto the screen and barely make out what was on the screen. It was booting properly and I assume that if I could make out the menu options the phone would still function. I assumed that she shorted out the LCD so I ordered, received and replaced the LCD tonight. Apparently this was not the problem, sucks to be me. I do think there was a problem with the touch screen portion already which is now working properly again but still I can still not see the screen for crap. It's like the brightness setting is on 1 or something. If I use a flashlight I can make out the screen, use the stylus and operate the phone. When I was replacing the LCD I noticed that the two circuit boards to the north and south of the LCD seemed to have a bit of corrosion on some of the tiny chips. I used an alcohol swab to clean the area off but that didn't make a difference. I am utterly convinced that the motherboard is fine since it seems to be well protected in the case and not easily accessible to moisture. I see no signs of corrosion on the motherboard like I do the two circuit boards around the LCD area. I noticed that there are only two contacts on the LCD one of which is a cable that plugs into the south circuit board just underneath the front panel key pad. Just to the right of that cable connection is where I saw signs of corrosion so I wonder if that board is the problem.
The computer tech in me says that I could be swapping parts all night before I get this right. Since the LCD plugs into that board, that could be the problem, there is a ribbon cable that wraps around the back of the LCD which also seems to make contact with the LCD which could also be the problem, that ribbon cable plugs into the north circuit board, so that might be a problem and finally, the ribbon cable plugs into the main board so that too might end up being a problem.
Can anyone take a guess as to why I might be seeing such low contrast/brightness from the LCD? I have already adjusted the brightness setting in the menus. I think it was called the backlight setting, but I moved them to the far right with no change. Again, this is a near pitch black screen that is only visible when I shine a light onto the screen.
i haven't taken my tilt apart but as a computer tech repairing broken laptops etc i know your problem.
as for laptops, there is a little inverter card that powers the backlight. its connected to the display unit by 2 cables (same as with my digital camera, rip ) and this boards are really weak / vulnerable to moisture...
so most likely this board is damaged...
That sort of explains what I think is going on too. Take a look at this cable (apparently it's clickable and will grow slightly in size to give more detail):
Let me explain the cable. This fits directly behind the LCD. The LCD comes with one flat ribbon cable and it plugs into a port on the right side of this picture. On that right circuit board if you notice the top left portion of the board there is thin black slot which is where the LCD plugs into if I recall correctly. There is another cable that plugs in just to the right of that jack from where I forget actually, lol. Once that cable is flipped over the bottom keypad on the phone sits right on top of that board. In fact on the other side you can even see the contacts for the outside buttons. The buttons in question would be like the green phone and red phone, the "e" shortcut and pretty much all the silver external shortcut buttons. Getting back to the cable, you will notice that in the middle of the cable there is a rather wide connection and that is the one that plugs onto the motherboard.
When I was replacing the LCD I spotted two sources of corrosion on both boards. The more plausible culprit was about 1/8 of an inch away from where the LCD plugs into the right circuit board.
I sent HTC an email seeing if they would help to which they told me to send it in. I have no intentions of doing that. I already know how to disassemble and reassemble the phone at this point and I already have 35 dollars invested into a new LCD. I am not about to spend 250 bucks to have HTC take 3 weeks to replace that cable. After some searching last night though, I have no idea where to get the cable. It seems that all the normal parts places on the web want 90 bucks for this cable, but at the same time they want 120 for the LCD. Obviously prices have dropped some because I was able to get the LCD new from ebay for 35. I just need help finding a place that will sell me that cable at a reasonable price.
Now that you have looked at the cable and that board, do you think it's possible that the right board could be the back light inverter that you were mentioning? If that's truly the correct board then it would make since that there is something wrong with it since I saw signs of possible damage and the LCD does work, just not strong enough to be seen with the naked eye. Since these things tend to work much like laptops do, I am leaning towards the possibility that you totally know what your talking about and that it would make since that this is the faulty part.
One other thought, the backlight is the piece that increases the brightness of the LCD right and not just some sort of overhead flashlight or something, correct? The term backlight almost implies a different part but I am pretty sure it's the term used to describe the brightness of the LCD in this case. I just wanted to make sure we were on the same page here.
Any additional thoughts?
Thanks
okay, to be clear about this. i am not 100% sure, if the backlight on the kaiser works the same way as the one on my IBM Thinkpad T41.
tl;dr; i don't know if the kaiser actually has an inverter board.
as for the cable: if you found a bit corrosion on both boards, i'm pretty sure that the reason why your backlight doesn't work.
about the last part: yeah, with "backlight" i mean the unit sits behind digitizer and LCD and increases the brightness of the lcd so you are able to read everything on the screen. i don't mean an overhead flashlight
btw, i just found this one
http://www.cellulardr.com/50H10051-41M-XC.htm
selling the cable / boards or about 90$
<edit>
disregard that... i noticed that the boards allways come with that cable assembly.... and cost about 90$ everywhere... will keep an eye on that.
</edit>
I'm going through the same thing. Did you ever replace that piece? Please let me know because it sucks to not use this phone.
I've just replaced the LCD display on my kaiser and it works fine as a display, but the touch function doesn't work at all. The part numbers are the same (60H00091-00M) and so is the type number (TD028TTEB3).
I don't think I have damaged anything in assembly or disassembly - using instructions from this forum. The screen was new and the old one worked before being dinkled with a key in my pocket.
Is there anything I may have missed, easy to damage or misalign etc which I can check before hunting for a new screen or phone?
Thanks,
You need a digitizer too. Most ebay shops only sell a replacement lcd screens without that part (if you got it from there). So if yours didnt say it had a digitizer on it/with it, you won't have any touch input. The part number might match a good copy from China or whatever, but might not be an original screen.
Thanks for the reply.
This screen was brand new and did have the digitiser, but I'm guessing it was second or reject stock.
The ribbon cable connection from the digitiser to the screen had been re-soldered badly and one leg was shorted to the frame. I've resoldered this and the screen is now working properly again.
Ok, my fault. While repairing I ripped the black flat cable that goes from the main board to the top board (there the cam and vibrator is located).
I can't simply change the cable since it's heat glued to the top board (on the mainboard it has a locked connector).
Any suggestion from the repair specialists here? I guess I have to replace the whole top module, that includes the cable.
Any idea where I can get one? Or is it possible the replace just that cable? Seems very difficult though (and I work in electronics)
Note: see the pix, there is a hairline crack on one side near the connector (center in the pix). It's completely open there.
Update:
There is now way one can replace just the flex cable coz it's heat sealed onto the top PCB. Only thing one can do is to replace the complete top PCB.
After some searching I found this interesting Taobao link:
http://item.taobao.com/item.htm?id=4686372956&is_b=1
That's the PCB I want! RMB98 is US$ 15.00 or so. However, I don't want to waste any money on stuff that doesn't work.
So I went to the "phone mall" in Shenzhen (Hua Quan Lu, near Saige). There were at least 10 shops with that module for my phone. I got one for RMB 90 and assembled my phone right away there.
After some fine tuning it worked. However, my phone has still the LCD digitizer problem and often (but not always) recognizes any touch only as a touch to the right side.
Another problem is that the G-sensor works only right-left axis and not up-down.
Since the digitizer change is quite difficult (even though the digitizer itself costs only $3 in China) I may just leave it like that. I bought already an HD2 anyway.
anyone know where to get the LCD connector on the motherboard from a Sprint HTC One?
as the picture shows, I've got a broken one that needs replacing.
It's 31 pins. The closing lever is on the back behind the slot to insert the LCD ribbon (white lever in picture). I think it's called an FPC or FFC connector. But I don't know the pitch.
thanks.
While I realize this post is some two years old, it came up pretty high on google search results, so I'm going to answer for the sake of anyone else that has this question and finds this post.
Code:
http://www.parts4repair.com/lcd-screen-fpc-connector-for-htc-one/
this appears to be exactly what you're looking for, but it looks to be a daunting task to replace.
Hello guys, Yesterday i changed the battery on my phone. After putting everything back together my screen stopped working, with no image and no touch function. The cable on the right bottom is connected but perhaps i damaged it in some way..
The phone is working properly, if I connect it to an HDMI it works.
Any ideas on what I may have done wrong and the solution?
I took it to a shoo and they say I have to replace the whole screen (USD 100 approx) which seems too much..
Check this coil. If it's shorted it's ok, if not make jumper on it. Also check filter (small bricks) under the LCD flex connector and LCD flex itself if it's not teared. Those are common damages which can be done disassembling this phone.
Yup it's the LCD flex that is dammaged.. Is it possible to repair? I'm guessing that on a shop they will want to change the whole LCD screen..
Unfortunately there is no way to change flex only. If it's damaged You have to change whole screen.
Ok, oh well that's life... thanks for the help though!