Display is working well, but touch screen is not working. With other module it works well. Is it possible to repair the touch screen only, not changing the all module?
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The touch screen (digitizer) is fused with the LCD together. Since that does not work you will need to replace it with a whole new screen.
Not really sure as to why the touch screen would not be working. Number of possibilities: liquid damage, screen display has too much damage, digitizer / touch screen got damaged after crack.
Clients that come to me for S4 screen repairs they usually either have a no display as in dead LCD or glass is cracked but touch screen and LCD display is working.
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Screen is not cracked, I don't know why it's stopped working
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There's a ribbon that goes from the touchscreen/digitizer over the top of the lcd screen and slips into a connector clip. Really small!! This might have become lose,or actually broken. Also at the top of the lcd screen there's 3 little solder connectors ( ÷ and - ) if these solder become loose it will also prevent the screen from being responsive to the touch but display will work fine.
Hope this helps
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