Continued from [New iPad Teardown (1)] Difference in Screen Quality
This time, we disassembled a used iPad 2 and the "Wi-Fi" and "Wi-Fi + 4G" models of the new iPad at the same time to compare them.
In the case of the iPad 2, a front glass integrated with a touch panel is attached with a double-sided tape. Without knowing it, we broke the glass when tearing down the iPad 2 last time (See related article).
We expected that the new iPad has almost the same structure as the iPad 2. Therefore, not to repeat the same mistake, we used a "heat gun" (hot-air heating machine for industrial use), which is like a high-power hair dryer. Also, we purchased a spatula made of carbon plastic. The catchphrase of the spatula is "Removal without making scratches."
First, we practiced with the iPad 2. We could not get the knack at first. But we eventually made a gap by heating the four corners of the iPad 2 with the heat gun and inserting a flat-head screwdriver into it. Then, we removed double-sided tapes by using the spatula while heating the glass little by little.
After peeling off the double-sided tapes from the four sides of the glass, we succeeded in removing the glass without cracking it. The spatula turned out to be more convenient than we expected.
However, we slightly scratched flexible cables that extend from the touch panel of the iPad 2 to its main board. So, for the new iPads, we carefully peeled off double-sided tapes at the parts where flexible cables were expected to exist. As a result, we succeeded in removing the flexible cables of their touch panels without scratching them.
After the front glass was removed, the LCD panel could be taken out just by pulling out four screws. And we found a rechargeable battery larger than that of the iPad 2.