If you are facing home key problem in Samsung I9300 It can be cause of water damage mobile phone or due to some broken parts. So check if it work, not work, or work time to time (some time work while some time not work Samsung GT-i9300 home key button)
When you dis assemble the phone and check strip jack as shown in above diagram you may find some carbon or rust in it. So make it clean and apply heat with heat gun to make it dry.
samsung gt-i9300 menu home button key ways
The distance between the touchscreen and home button menu keys are not adjust
check when you open his cell phone home button key flexi cable
broken or not connected properly
if the home key button flex its better
Hints to fix Samsung Galaxy S3 I9300 Keypad Problem Repair Solution:
Check/clean the keypad PCB matrix.
Clean/replace the keypad membrane..
Note: Please note that even though every solution posted on our website is tested by one or more members of our team before posting, but still we do not take any responsibility for any damage it may cause to your cell phones. Use these repairing solutions at your own risk.