07.06
Although the sticker for the button's wiring is not arriving until tomorrow, the tri-chloroethylene solution used for cleaning has already arrived. Therefore, I immediately performed an unplanned temporary repair, with the goal of re-cleaning the conductive rubber with IPA (isopropyl alcohol) and cleaning the gold fingers that come into contact with the conductive rubber, as well as replacing the polarizing film.
Since this was the second time I had disassembled it, I was very skilled at removing the screws and taking off the top cover. The entire process took only 6 minutes.
ATTENTION!!! Trichloroethylene is a Class I carcinogen. Please operate only in a well-ventilated area while wearing appropriate personal protective equipment, including but not limited to masks, goggles, and gloves!
I chose the dirt road right outside my house and used the remaining toothbrushes from my family to clean the conductive rubber and circuit board. Unlike the first time, this time I didn't dilute the cleaning agents at all, because I thought that using them in their original, concentrated (analytical grade) form would be more effective.
After completing the steps above, I cleaned up the work area and returned to my workbench to continue replacing the polarizing filters.
During the replacement, I noticed that the 910H had polarizing films on both sides of the screen. I first replaced the film on the front side. Removing the old polarizing film was difficult; I had to carefully use tweezers to pry out a corner of the film from the edge of the screen, and then I could simply tear it off (which also took a lot of effort because the adhesive was very strong). It took me about 45 minutes to remove the old polarizing film, which was time-consuming and tiring!Please note: When removing the old polarizing filter, handle it carefully to avoid damaging the glass screen with tweezers!
After removing the old polarizing film, you'll find that there is a lot of glue on the screen that is difficult to remove. At this point, you need to buy a bottle of 95% ethanol (also known as alcohol, which can be purchased cheaply at pharmacies) and apply it to the screen. Wait for about three minutes until the alcohol has mostly evaporated, then use a lint-free cloth or professional cleaning paper to wipe the screen. You will find that the glue on the screen is now easy to remove. Because I didn't want to go to the pharmacy (it was too hot outside at 38°C), I used floral water as a substitute.
Next, I removed a small portion of the plastic protective film attached to the new polarizing filter (which I bought on Taobao with parameters of 0°), and determined which side had adhesive. Then, I brought the adhesive side close to the screen and rotated the polarizing filter until it displayed normally (the 910H needs to be tilted to display correctly, which is a rotation of 45°). Remember this angle, and cut out a polarizing film that is the same size as the screen using this angle. Then, use dry and wet tissues to wipe the screen clean of dust and other debris, and finally remove both protective films and attach them to the screen. This step tests my installation skills, and unfortunately, I made several bubbles during the process. Fortunately, they didn't significantly affect the display.
Current results: After cleaning the conductive rubber and gold contacts with chemical agents, the areas of the screen that were previously blank now show a faint image, but it is not yet satisfactory. Therefore, I have decided to directly replace the conductive rubber (purchased from Taobao for 35 yuan, 20 pieces), which should take about one week to arrive, and I will continue to update the post around mid-July. Regarding the polarizing film, after replacing it, there was no noticeable improvement; this may be because I did not replace the back layer, so I will replace it along with the conductive rubber next time.
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