I have replaced LCD/Digitizer assemblies on 4th gen iPod Touch's over 300 times in the past two years and it took a while to get it down to a science. If the glass was not shattered too badly to begin with, I use heat to carefully remove the glass and preserve the original adhesive, clean with alcohol and toothbrush when you are done picking out the shards, and be sure to keep track of which screws go in which positions. Install new screen and reassemble.
If I do the above method and still have that top left corner raising on its own, I disassemble the iPod and remove any extra thickness wherever I can.
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1: Remove the foam/adhesive from beneath the WiFi antenna (it's still sticky after ^^)
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2: Remove the bushing under the top screw of the volume keys
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3: Remove the transparent 2-sided tape from beneath the metal plate that raises it off of the motherboard where the volume flex connects.
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4: Remove the black tape on the top of the volume flex screws.
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5: Ensure the metal casing is not dented on the back, and that the corners are not bent.
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6: If they are, bend them back.
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7: Last resort, blame the parts and super-glue it in place.
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# Remove the foam/adhesive from beneath the WiFi antenna (it's still sticky after ^^)
+
# Remove the bushing under the top screw of the volume keys
+
# Remove the transparent 2-sided tape from beneath the metal plate that raises it off of the motherboard where the volume flex connects.
+
# Remove the black tape on the top of the volume flex screws.
+
# Ensure the metal casing is not dented on the back, and that the corners are not bent.
+
# If they are, bend them back.
+
# Last resort, blame the parts and super-glue it in place.
I only replace the adhesive if the existing stuff is full of glass fragments and dirt.
I have replaced LCD/Digitizer assemblies on 4th gen iPod Touch's over 300 times in the past two years and it took a while to get it down to a science. If the glass was not shattered too badly to begin with, I use heat to carefully remove the glass and preserve the original adhesive, clean with alcohol and toothbrush when you are done picking out the shards, and be sure to keep track of which screws go in which positions. Install new screen and reassemble.
If I do the above method and still have that top left corner raising on its own, I disassemble the iPod and remove any extra thickness wherever I can.
1: Remove the foam/adhesive from beneath the WiFi antenna (it's still sticky after ^^)
2: Remove the bushing under the top screw of the volume keys
3: Remove the transparent 2-sided tape from beneath the metal plate that raises it off of the motherboard where the volume flex connects.
4: Remove the black tape on the top of the volume flex screws.
5: Ensure the metal casing is not dented on the back, and that the corners are not bent.
6: If they are, bend them back.
7: Last resort, blame the parts and super-glue it in place.
I only replace the adhesive if the existing stuff is full of glass fragments and dirt.