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LCD Refurbish All things related to LCD / Screen refurbish and repair

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Old 12-06-2017, 18:52   #226 (permalink)
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Quote:
Originally Posted by alexz408 View Post
The problem for the bubbles is the oca theirs a lot people claiming to sell original oca from Mitsubishi but it's false advertising / if you have original Mitsubishi oca and you have a bubble you don't even need laminating machine in couple of hours it will removed by itself .
Dear in my opionun Oca brand and material only effect process settings, yes Oca can cause bubble only in below case
1) damage due to mishandling
2) size to big or to small
3) stores long time ( oca can use upto 6 month from manufacturing ) if store at 5c to 12c , at 25c can store upto 72 hours only
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Old 12-06-2017, 19:07   #227 (permalink)
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Quote:
Originally Posted by bajinchi View Post
Hi Guys,

I was lucky to get here, as I was looking information related with OCA equipment and I just read this thread.

Actually I do LOCA repairs, struggling a lot with LCDs with BACKLIGHT but the work can be done.

So, trying to help here, I found this 3M document about OCA, that maybe can help to fix the bubbles problem showing up after their removal.


I can´t post the PDF as I have less than 10 posts, so google this and it should be the first hit:

Optically Clear CEF TB qxd - 3M


And now the highlights I think are important here to solve this out:


Step 1: Baking

Samples can be baked at 85°C for 2-5 hours, depending on the plastic thickness; the thicker the plastic, the longer it takes to remove moisture

Are you guys “baking” the OCA before using them to remove moisture from it? Or it can be from the recently cleaned LCD and the moisture came from it? Or both? Or his step can´t be applied to the OCA sheet as it can melt?



Step 2: Lamination

In the document is made by hand with a roller…



Step 3: Autoclave

Temperature: 30-60°C

Pressure: 70-100 PSI

Duration: 20-60 minutes


I thought that there is vacuum inside the autoclave, not pressure… am I correct?

cellularman89 in process #8 do this at 55ºC by 20 minutes at 6MPA (no idea what MPA is…yet) Maybe a new setting to try?


Step 4: Durability

This step is meant for customers who would like to determine the effect of long term device exposure to high temperature and high humidity. Most moisture absorbing substrates (e.g. PC and PMMA) fail this process because they outgas at high temperature and high humidity creating bubble in the assembly. Step 1 above is implemented to improve outgassing problem.
Here is a typical accelerated process condition.

Temperature: 60°C
Humidity: 90% R. H.
Duration:12-72 hours


This should be to have in consideration if bubbles appear after the de-bubbling process? Weird... but it points back to Step #1 of the document...



Maybe someone with these tools can help to try this new settings described in this document recommendations and let us know if it helps?



Thank you guys.
Dear you read out 3m oca life testing parameters, and in other hand it's a UV oca, it's need uv after autoclave and it's hard Oca, after put in uv it's become very hard to remove
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Old 12-14-2017, 19:41   #228 (permalink)
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The problem you are having has many causes:
1. When you insert the LCD into the pressure cooker, please set the high temperature (to equal the room temperature). This is the most important

2. When you cover the OCA on the LCD, the edges around the LCD are redundant.

3. When rolling OCA on an uneven LCD may also be the cause.

4, Finally, after trying all the steps above, you change the other OCA provider, or you preserve the OCA glue incorrectly (must be stored in the refrigerator during storage. )

Here are the steps to overcome the phenomenon of bubbles returned after a short time, I have experienced this problem as you, really very difficult to go.
Nice to be acquainted with colleagues.
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Old 12-17-2017, 12:22   #229 (permalink)
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Dear

Carefully Watch Video, If Still Same Problem so Kindly tell us.

http://www.youtube.com/watch?v=g9p8afNrJsk

Last edited by onlinebaba; 12-17-2017 at 12:28. Reason: Type error
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Old 03-25-2018, 19:37   #230 (permalink)
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where can i buy tha lcd test machine

which oca machine is the best..ak pro..m triangle 102 or baku bk-958,,bk 957

olz suggest iam planing to buy.

regards!
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Old 05-05-2018, 20:07   #231 (permalink)
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Vacum Time: 15s
Lamination: 120s
Debubbling: 10 mins
Outgassing: 5
Temperature: 50C
Pressure: 7 MPA

not working
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Old 06-12-2018, 13:36   #232 (permalink)
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bubble problem because you apply too much pressure on the oca when you laminating on the glass, under your hand pressure it contracts and when you put in the autoclave it appears back because of the high temperature. I suggest use less pressure and put glass in autoclave for 10 min / 55'C.
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Old 06-14-2018, 10:49   #233 (permalink)
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Edit to my post above:
I have
bigger machine the manufacturing one with its own clean room with specific metalic molds with four layers that machine does glass laminating and then glass on lcd laminating in vacuum but takes some time and whole manufacturing stops until I finish the glass but never use bubble remover, so I got myself a clean room and put the smaller oca laminator like one in your video it has build in vacuum pump, after using it I noticed that problem , thankfully was able to solve that problem by applying less pressure and using bubble remover on glass without lcd.
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Old 07-20-2018, 07:46   #234 (permalink)
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Quote:
Originally Posted by chand_gee View Post
must buy professional machine and separate for laminat and bubble remover
is not the new machine all in one good too? always laminate separately and buy bubbles remover extra? A company would like to sell me the "AK Pro" machine.
regards
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Old 01-28-2019, 19:59   #235 (permalink)
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Hi friends, I have a problem with Samsung amoled screen repair. When I fix the Huawei LCD, everything is fine. The same oca glue, the same pressure and temperature.

In the laminating press:
temperature 40 "
lamination time 15s.

In the bubble remover autoclave - temperature 23", 15 minutes, 6bar..

Huawei is perfect, but Samsung has bubbles.

When someone will help me and solve the problem, I offer a gift of 50 $ on paypal

Please, let me know about PM.
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Old 01-30-2019, 03:00   #236 (permalink)
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Quote:
Originally Posted by Telekubson View Post
Hi friends, I have a problem with Samsung amoled screen repair. When I fix the Huawei LCD, everything is fine. The same oca glue, the same pressure and temperature.

In the laminating press:
temperature 40 "
lamination time 15s.

In the bubble remover autoclave - temperature 23", 15 minutes, 6bar..

Huawei is perfect, but Samsung has bubbles.

When someone will help me and solve the problem, I offer a gift of 50 $ on paypal

Please, let me know about PM.
Set the lamination time to 45s temperature 35
In autoclave set temperature to 35, time 7-10 minutes
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Old 01-30-2019, 10:43   #237 (permalink)
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plz tell autoclave preesure in lbs
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Old 02-01-2019, 02:26   #238 (permalink)
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Quote:
Originally Posted by rajeshe View Post
plz tell autoclave preesure in lbs
Standart autoclave pressure - 6 bar = 87 lbs
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