Chosen Solution
Hi, I’ve been restoring a wrecked iPhone 6 to new condition and unfortunately the original screen was smashed to pieces and flex cables were ripped. So I purchased a new screen assembly(front camera etc included) and a new housing as the original was bent moved everything over, phone worked perfectly except the touch screen. So I assumed bent iPhone 6 = touch disease (even though it showed no grey bars or other symptoms) thus I tried re soldering the touch ic chip. Finished doing that and the iphone still turns on but still no touch. The new screen assembly works with touch on a test phone so it’s definitely not the screen itself. Any help would be greatly appreciated, Thank you.
How bent was your device? The risk here is that the logic board took some damage in the Touch area. This could be a problem with the CUMULUS/MESON IC’s, or the CHESTNUT IC which powers them. This could also be damage to a passive component on those lines, such as a cracked component or solder connection. Worst case, this could also be some cracked internal lines. As Chris suggested, start by comparing the LCD/Touch connectors to a known-good board (or the values in ZXW). If that doesn’t give you any leads, carefully inspect the board and possibly reflow, or better yet, replace the IC’s mentioned above…one at a time.
