Replaced screen and digitizer, but touch doesn't work

http://forum.xda-developers.com/showthre...

There is a picture in this link of the coil location. I forget what connector that is but im sure you can figure it out by how many pins are in the picture.

i had the same problem. go3 model isnt compatible to asus tf300t. looks like i need to order go1 instead. but what an inconvenient problem. asus is one dumbass company.

It could one of several things.

First was the power switch still on and the battery plugged in when you detached the original screen?

This could have caused a small surge and blown out a micro fuse or some micro electronic piece. Its located near the digitizer cable. You would see a small scorch mark there. You will have to run a jumper to get it to work. Just bypass it with solder.

Second you could have the wrong digitizer. There are several models. Make sure the part number matches the old one.

Third. the cable could still not be in all the way. check this first. It shouldnt need any type of software upgrade or update to work.

I need to replace my digitizer on the tablet asus transformer pad tf300t-1e018a. The problem is i did not know there were 4 versions of it before i threw the old one out. Is there a way i can find out from the model number, serial number, or any other specification present on the mainboard or other parts of the tablet except the digitizer ribbon, which version i need to order?

Maybe someone with the exact same model can tell me which digitizer they have?

No answer for you but just went through the same thing. Never any problem with touch screen, then dropped and cracked screen. Didn't work. Bought new digitizer and just installed without sticky tape for testing purposes. Getting the same result. What else could have broke when I initially dropped it so only touchscreen would not work? Used the keyboard with it so I know everything else works.

Im having kind of the same problem. I am working on one for a friend and replaced the LCd and kept the digitizer. Everything went smooth. Until i was taking the digi from the lcd. A small crack near the bottom of the digi appeared but it was small and in the black bezel area. Got it back together and touch screen wouldnt work. Left it alone for a bit and got back to it and tried to seperate the digi from the lcd again. Another small crack formed. This time near the digi cable in the black outside area. Still not bad but this time i tried to really seal the digi back down on the lcd. I think the sticky pad around the outside is causing a bad buffer between the lcd and digi. When i tried the reseal now half the screen worked or slightly less. It sounds like its a matter of sealing up the digitizer to the lcd firm enough. Hopefully in my problem the second digitizer break didnt end all hope.

Mark,

I found that the digi and the lcd work independent of one another. There is nothing to worry about the"buffer" between the two. In my case, the first digi I got the ribbon/glass connection point started peeling up and I got intermittant operation. (Luckily I didn't stick everything together yet). With my second digi I got, intermittant operation again. Eventually found that the connector, both digi and lcd were finicky. I used the sticky and the existing foam rubber to help keep these connectors in place. Everything good now.

hola yo cambie touch sren estrellado ya no funcionaba nada compre el digitalizador nuevo me costo trabajo despegarlo del lcd pero o consegui los adesibos se dañaron los sustitui or cinta adhesiba doble por ambos lados sellando perfectamente lcd y touch acontinuacion de terminar de armar al encender el digitalizador touch nuevo no funciona nada como al principio con el estrellado

Hmm just replaced the digitizer and touch screen does not work. But it did not work before the change because the old digi was cracked all over. Lcd is good however.

Cables look like they are in all the way and snug. Could i need to reset the software through the software? Maybe the new digitizer is bad?

Mark,

The 2 connectors, lcd and digitizer, are finicky on mine. I had to take tablet apart a couple times to "reconnect" them. I used masking tape to better hold them securely. A loose ribbon cable connector means no digitizer operation. A loose fine wire connector in the center of tablet means no lcd operation. Good Luck

Chris. I have checked and rechecked cables. I now have another digitizer brand new to try out. Still nothing not even intermittent touch. The only thing i have found is the ribbon from the digi board to the main board has one contact kinda scrunched up. It seems like its in far enough to get past the scrunched up part. But even so wouldnt there be intermittent touch?

Could the digi board be bad somehow. ...

When i first did the replacement the screen was working even after i changed the lcd and the old digi first cracked. Cant remember when the digi stopped working all together. But i suspect this ribbon cable and have ordered a new one. Ughhhh, I would say ill never repair another one of these but my experience with them now is getting in depth.

So i have replaced the digitizer board ribbon that connects to the main board. I found that two of the contact points were bent up and peeled back or tweaked. SO i replaced that.

So for all who are taking notes.

broken lcd problem, replaced lcd while replacing cracked digitizer. Touch started working spotty if not at all.

replaced digitizer, touch not working at all. checked and rechecked ribbons.

Replaced main digitizer - main board ribbon. no touch. rechecked all connections.

next step.... replace digitizer board? I guess its at this point. The only thing i can figure is the bent/tweaked connections on the main ribbon shorted the board?

One question i have and cant remember is could the lcd be the wrong version? I know the digitzers make a difference. And i have the exact match of digitizer. But i did not know of other versions of LCds. I have not heard that there is other versions just I wonder if there is and that is why the touch is not working.

On you tube there is a video of a factory repair where the factory sent it back to the owner saying they could not find out the problem. And it has a no touch problem also. I hope that is not the case or else im buying a new tablet for someone.

asus transformer t300t have three differant digitizer you need the same one near the ribbon there is a white sticker with writing on it only and nothing under on some some have white numbers and letters under sticker look at the last three might say g01 or g03 it has to be the same one other wise wont work just like the xbox 360 they have differant dvdroms some toshiba,samsung ben-q and so on if uyou but differant brand the xbox dvdrom wont work some how asus transformers are the same way

Hi Mark,

I found your very useful. I have a TF700 and got the same symptom than you had. I didn't disconnect the power while replacing my broken digitizer by a new one. I guess this is why my touchscreen stoppped working since...

Would you know where is that micro fuse located exaclty? I have not been able to find it. My electronic knowledges are a bit rusty. I am looking for a little "F" (for fuse) somewhere on the digitizer or main board, but cannot find one.

Would remember where that forum you fond the answer is?

Also, my batterty is showing has empty when I power up the tablet, did you have the same symptom?

Thanks

http://forum.xda-developers.com

It was in this site. I dont have time to go through it again. But if you search the tf300t forum for Coil you will find the right place just research and you will find it.

maybe you didn't placed the cable to socket firmly. i have experienced that. sorry for may bad english

Wish there was a way to attach a picture to this fourm, https://www.dropbox.com/s/ajmnqjciis1wi5... Is this the micro fuse ??? used my multi meter and got OL across this one. The one above had connectivity. Used Radio Shack conductive wire glue to bridge the 2 solder connections over the top of the component.

michaellaforge

hye Mark Mata, I have the asus transformer tf300t, and i have the same problem too. my touchscreen tab doesn't work. I think is broken the PCB's micro fuse. it's possible to send me a photo to understand the exactly position of micro fuse, and repaire them??? please help me. thanks a lot. gurigjiri

hye, I need the picture of the PCB Board to know where is the microfuse of it, coz the touch screen of my tf300t doesn't work. please help me to solving my problem. i hope you send me the link where i foud it. thanks a lot for helping. gurigjiri

I broke my digitizer and disabled my touch screen. We replaced the digitizer but not when I try to scroll down it goes up and vise versa, also only the left side of the screen works. I have tried many different troubleshooting tactics but none seem to help. Does anyone have any suggestions?

I have trying to make button on top part of my asus work it seem

To be siickin or stuck for some

Yours truly Brenda