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Cuarta generación de iPad, lanzada el 2 de noviembre de 2012, disponible en modelos de 16, 32 o 64 GB. Número de modelo A1458

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Screen Replacement Premuim Red Tape

Hi.

Just a quick question. I have been using a pre-cut 3M adhesive for Ipad screen replacements (not the generic crappy cheap stuff that is pre-installed or the the fake 3m) with extremely good results. 30+ Ipads from 2 and up with 0 screen lift. The question is due to the pre cut being a little bit expensive I have started using the Premium Red Tape. As I have know experience using this product do people heat the outside of the glass to seal or just once the screen is down leave it. I have been told by the supplier to add some heat to activate it but is this necessary. I tried to pry up after sticking it down and felt pretty solid to me with no heat. The other problem i had which may or may not be related is the screen around the adhesive got warm but looks like on the back of the digitizer where you peel the film off before setting down may of gotten a little warm and left a smudge. Anyways what do you do with the Red Tape heat or no heat?

Thanks

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Hi,

I was searching for answers over days to this because I have had to re-glue my screen on an Xperia Z3 twice now, and tore the flex in the process, so I needed a whole new screen. There are very few numbers to go around and I wanted to put this here so anyone googling for answers will get an idea with numbers.

0) Screen and digitizer flexes seem to get thinner and thinner and over time get brittle, mine was weaker than paper when it tore.

1) Remove all traces of the old glue and make sure to prep surfaces with isopropyl alcohol (I use 99.9%). With a microfibre (lens) cloth. A pencil eraser cut to size helps with this but I use a pin moving in one direction like a chisel.

2) Pre-cut black adhesive seems to be 0.2mm thick.

3) Red tape is 0.2mm according to the place I bought it from and is clear adhesive with a red backing you peel away. I measured it with my calibrated vernier calipers, and it is 0.2mm thick with a 0.1mm backing thickness (that is peeled away).

4) The tape I bought did not claim to be 3M, it was from ebay. I measured the strength of 1mm wide tape at room temperature. I put a 16cm (~6”) length on a stainless steel ruler, and pressed it down to an aluminium plate of a heat plate (turned off). It took about 2kg (4.4lbs) of force to lift off the plate plus or minus 0.5kg (1.1 lb). I had pressed the two together for 30 seconds to ensure a bond and left a 0.4kg (0.9lb) weight on it for 3 minutes.

5) I repeated the above with 55 degree C heat (131F) for 3 minutes. I tried lifting it off and it took about 3.5kg of weight plus or minus 0.5kg. My force measurement was not very accurate, but I was not doing a lab test here.

6) So at this temperature and amount of time the strength of the glue is better by 3.5/2 = 1.75 times. 75% increase in strength is worth it to me. It translates to 31psi of strength.

7) You can try other temperatures and timing to see what works for you. I was happy with this.

8) When I used pre-cut adhesive I heated the phone up to 85 degrees C four times (for each side of the adhesive for the front and back of the phone) and it lifted within days. I was worried about damaging the screen but this did not happen.

9) Another way of looking at it is the total force the perimeter of the phone would take to lift and it works out to be 9kg (19.8lbs).

10) These repairs are not waterproof, but if your edges between glue strips is very close, it’s probably rain resistant. You can try a bead of b7000 glue in the crevices to make it more waterproof, but I haven’t tried this yet.


P.S. Please be careful when ordering screens online that cannot prove they are OEM or compatible in all dimensions. I had to return a screen that was 0.2mm too thick. This means a lot of wasted time for something that has a screen sticking out that will get dirty and chipped and if you do this for a living, it will attract refunds. I’d say measure the screen thickness first with calipers as well as your glue thickness. Compare this to the recess in the frame. They should match!

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I always heat my adhesive. I have had great luck with a supplier that uses some of the best digitizers I've ever used with preinstalled adhesive that looks and feels just like the original Apple adhesive. I use a hair dryer to heat it, so that I dont over heat it.

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If the tape is the right quality you do not need to heat it. Provided the digitiser flex cables have been seated in the frame correctly and not trapped between the digitiser and the frame, this tape should stick. I use Red Tesa Tape as well, but it is the good quality tape, for the price, it is not worth scrimping on what would cost you at least 1-2 hours time wise for a returned repair, plus the unhappy customer. I only use the tape on the straight edges and use E8000 glue on the corners. This glue is brilliant and gives about 15 minutes adjustment time before it is set.

I always then use masking tape to hold the screen in place once the screen is fitted and tell the customer to leave it on for 24 hours. Never had a come back yet

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