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[Q] LCD and touchscreen not working now after disassembly - Connector broken?

I took my TF700 apart last night as the digitizer was not working following a drop and assumed that a cable had come loose.
Anyway, made a mistake while doing it.
I could not disconnect the cables between the LCD and digitizer and the connectors.
I since realise that there is a small white bar that you flip up. I presume I have "broken" the connectors or something as the tablet works fine when plugged into HDMI, but I cannot use the digitizer and the screen does not come on.
Any suggestions? Most that I have found have suggested "throw away and buy again as spares too much", but wondered if anyone had a bright idea.
I have found why the digitizer was not working, there is corrosion over the SD card and around the top connector to the digitizer nearest the SD card slot. It looks like mositure/drip got into the slot and may have shorted something? I have cleaned off the surface debris as much as can.
Anyway this would not impact the LCD which still displayed (until connector concern.)
Following that, is anyone getting rid of their TF700 and would be interested in selling it at a sensible price?
Thanks

If you didn't pull that white bar off or break it, it could possibly be that you have not properly inserted the ribbon cable and fastened the connector. I would open it again and check this before I did anything else.
Most of them work like this:
Open it by pulling at each end of the white bar until it moves foward a little, then gently lift it to about 45 degeres and the cable slides out with a slight tug. Putting the cable back in is the reverse. That bar has to be loose and at about 45 degrees to get the cable back inside the connector. Make sure the end of the cable is in straight and close the connector. Cable should be tight and not come out if you gently tug it.

The OP here may be willing to sell a likely brick:
http://forum.xda-developers.com/showthread.php?t=2769818

flhthemi said:
If you didn't pull that white bar off or break it, it could possibly be that you have not properly inserted the ribbon cable and fastened the connector. I would open it again and check this before I did anything else.
Most of them work like this:
Open it by pulling at each end of the white bar until it moves foward a little, then gently lift it to about 45 degeres and the cable slides out with a slight tug. Putting the cable back in is the reverse. That bar has to be loose and at about 45 degrees to get the cable back inside the connector. Make sure the end of the cable is in straight and close the connector. Cable should be tight and not come out if you gently tug it.
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Thank you for the suggestions, I have tried that, but none of the 3 connectors (2 for digitizer, 1 for LCD) respond. I connected it to the HDMI, but cannot see the screen respondin to my finger (maybe that is broken also ha ha)
Is it more likely the connector, or cable is broken? I suspect connector pins to be honest. Abit small for me to see though.

Digitizer or Ribbon Cable or ZIF socket ??? How to tell ???
dilfred said:
Thank you for the suggestions, I have tried that, but none of the 3 connectors (2 for digitizer, 1 for LCD) respond. I connected it to the HDMI, but cannot see the screen respondin to my finger (maybe that is broken also ha ha)
Is it more likely the connector, or cable is broken? I suspect connector pins to be honest. Abit small for me to see though.
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Click to collapse
Greetings!
Just curious how this problem worked out? I too have a TF700 with a working screen but no digitizer. Some time back during my first battery replacement (another story) I tried (we ARE a curious species you know) to open the ZIF socket for the digitizer cable (has twin, gold ribbons) and accidentally flipped the wrong side... needless to say it did NOT flip open. The black plastic top of the socket broke off exposing a little of the ribbon. Everything still worked fine so I counted myself lucky and closed her up and all was good.
Unfortunately I'm never willing to leave sleeping dogs alone and I attempted to replace the 2nd dud battery with yet another one (don't ever trust those "Brand New" eBay batteries)! This time I must have accidentally pulled on a ribbon cable a bit too much. When I closed up the tablet I ended up with a tablet just like yours... everything works great... just not with my finger! I opened it up AGAIN... to replace the original battery... you never can tell you know... while I was in there I tried reseating the digitizer cables (both sockets)... no luck.
So... now what... I'm hearing that some folks had their digitizers fail after about a year anyway... mine is two years old... so my digitizer COULD have just failed... or it COULD have been my messing with the ribbons and/or ZIF connectors. How to tell ??? Is there ANYTHING one can do short of ordering a replacement ZIF socket PC board ($25 eBay) and / or ribbon? With a two year old device I'm reluctant to spend much on repair... ASUS wanted $184 to fix it... and buying an eBay digitizer or ZIF board on the blind chance that one or the other is the problem seems a bit risky.... to say nothing about the chance of mucking up the heat separation of the LCD/digitizer! What's a digital explorer to do???
The only thing I was unable to determine was where does the forked golden digitizer ribbon cable GO on the glass end. Does THAT end ever come loose? How does it attach to the digitizer? Anything I could "fix" on that end?

[Q] replaced digitizer now screen is not working

hi,
I might be posting this again so sorry for that and bad grammar if any.
I replaced digitizer on my pad and now screen is not working . i hear notification sounds coming up so i am sure that its switched on. but nothing is on the screen. and also the indication light wihich turns green when charging is also working. i am able to access internal memory fwhen connected to pc so i think everything is okay inside.
thanks

Check the following after you pull the back case of the unit and then flick the main board power rocker switch to the off position:
- the LCD connector that runs across the battery - make sure that both ends of it are plugged in and make sure they are both snug. Re-seat the connectors. Make sure there are no broken pins on both sides in both the male and female parts of both connectors. Also make sure that you did not kill one of the connector wires.
You may have broken your screen when pulling it off the digitizer. One strong pull or twist too many or too much heat from the heat gun can do that.

Check that you have put the ribbon connectors in properly.. I just did one late at night and found that had not locked them in right.. Also check you have the right parts as it seems there were different variations being sold

[Q] Can I fix this broken connector on my motherboard?

Hi,
The connector on the motherboard that has the flex cable which goes to the smaller board down of the battery is partly snapped off. (imgur.com/BnYn0OZ left side) This also means my screen is disconnected... When pressing on the connector it will still work but when not pressed the screen is just blank. Can I fix this without buying a new motherboard, which is expensive as ****, or am I screwed?
Thanks in advance!

teunko123 said:
Hi,
The connector on the motherboard that has the flex cable which goes to the smaller board down of the battery is partly snapped off. (imgur.com/BnYn0OZ left side) This also means my screen is disconnected... When pressing on the connector it will still work but when not pressed the screen is just blank. Can I fix this without buying a new motherboard, which is expensive as ****, or am I screwed?
Thanks in advance!
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Click to collapse
You can stick something (like little plastic sheets) at the back of that cable, so it is always pushed against back cover.
I fixed a similar problem in my old Canon point and shot digital camera this way

hevangel said:
You can stick something (like little plastic sheets) at the back of that cable, so it is always pushed against back cover.
I fixed a similar problem in my old Canon point and shot digital camera this way
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Thank you so much!! It works again!

Golden battery holder wire is cut. Need to turn on for recovery

Hi guys. This is gonna sound awkward. I'm having issues in my personal life and I was talking on whatsapp with brother when I got angry and threw my nexus. the screen is broken like colors and stuff and lines so I tries to turn the phone off by touching where the power off button appears on screen butI couldn't.
since I was angry I removed the back cover and cut the golden wire at the bottom point where it turn. I've tried turning it on by holding the cut ends but no luck. tried charger too but nope. All I wanna do is get into recovery somehow (TWRP) and dump my internal storage.
Thank you.

After some thought about your description.... I wonder if you have actually cut the main ribbon cable from the microphone/speakers/USB assembly this is the one that runs down the side of your phone. your best bet will be to purchase another cable assembly.. since you are dealing with a multi conductor ribbon cable.
I really doubt that you will be able to repair and re-connect the cable without some pretty highly skilled soldering ability.
The battery cable is very short and comes directly out of the battery itself... it is not likely that you actually cut it but did cut the main circuit cable. Too Bad, but this will be a real problem for a repair.
no joy... but you might want to investigate a reputable repair shop.

paultbear said:
After some thought about your description.... I wonder if you have actually cut the main ribbon cable from the microphone/speakers/USB assembly this is the one that runs down the side of your phone. your best bet will be to purchase another cable assembly.. since you are dealing with a multi conductor ribbon cable.
I really doubt that you will be able to repair and re-connect the cable without some pretty highly skilled soldering ability.
The battery cable is very short and comes directly out of the battery itself... it is not likely that you actually cut it but did cut the main circuit cable. Too Bad, but this will be a real problem for a repair.
no joy... but you might want to investigate a reputable repair shop.
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Thanks so much for replying. Yes indeed I cut the ribbon cable. I'm in no position of buying a new one. I guess I'm gonna take it to someone with high soldering skill. Before that I'm gonna try tape too

Xami said:
Thanks so much for replying. Yes indeed I cut the ribbon cable. I'm in no position of buying a new one. I guess I'm gonna take it to someone with high soldering skill. Before that I'm gonna try tape too
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Question: if this ribbon isn't battery wire then why the phone doesn't start

main connection cable ( do NOT cut)
Xami said:
Question: if this ribbon isn't battery wire then why the phone doesn't start
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That ribbon cable is the one that interconnects the working boards in your phone, Microphone, Speakers, buttons. Unlike the battery cable you probably won't be able to fix it... it is pretty much a replacement only part.
this part is called -- LG Nexus 5 D820 D821 Charging Port Flex Cable Dock Connector USB Port With Mic Microphone Flex Cable Repair Part (amazon.com)
you will have to source a supplier close to you... but the good news is that it is relatively inexpensive... Ebay has it listed for $10USD or so.
not trying to be the bearer of bad tidings... but I've spent 20 odd years repairing computers and associated devices. It is always best if you don't cut ribbon cables.

Question on Auto-brightness sensor after screen repair.

So, I broke my screen and did the repair myself. Everything went well, except during reassembly I discovered that when I popped the antenna wire off the socket, I pulled the socket off the motherboard. I was able to solve this issue by soldering the bare antenna wire end to what remained of the socket...which was s tiny strip of copper where the socket used to be. After getting the wire to stick, I finished reassembly and everything work.... almost.
I discovered my auto-brightness is not working, along with screen shutoff when I bring the phone to my ear. I'm guessing I didn't plug a ribbon in correctly or fully. Can anyone give me any more detail on this sensor and how it connects to the motherboard? I can go back in, but I don't want to do it until I'm clear as to what I'm doing.
The phone is still usable though.... oh, one additional note. The screens available for around $50 are not of the same build quality as the OEM screen. They scratch allot easier. Probably not gorrilla glass III.

tonyzoc said:
I discovered my auto-brightness is not working, along with screen shutoff when I bring the phone to my ear. I'm guessing I didn't plug a ribbon in correctly or fully. Can anyone give me any more detail on this sensor and how it connects to the motherboard? I can go back in, but I don't want to do it until I'm clear as to what I'm doing.
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You might have disconnected or forgotten to reconnect the proximity sensor to the motherboard. Provided your replacement unit even comes with one. If not, you may need to do some additional hacking.
EDIT: looks something like this

robogo1982 said:
You might have disconnected or forgotten to reconnect the proximity sensor to the motherboard. Provided your replacement unit even comes with one. If not, you may need to do some additional hacking.
EDIT: looks something like this
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Click to collapse
Thanks!. I know that part and I might have not plugged it in fully. Also, there is a metal plate that sits over it, and I discovered I forgot to put that plate on after I had it all put back together. I'm going to go back in and check and replace that plate. I'm a little hesitant to go back in because during the screen replacement I broke the wire antenna socket off the motherboard when I popped the connector. I literally had to solder the antenna wire to the tiny copper strip left in the antenna socket hole. It worked as I have good wifi and mobile data, but it's extremely fragile and I don't think I'll get a 2nd chance if I break that wire off.