Just refer to the solution below and do some check up on the highlighted components.
Samsung Gt-S7562 Touch screen problem hardware solution
Samsung Gt-S7562 Touchscreen Ways
Try To Replace It With A New Lcd
First Check Its Touchscreen Working Voltage At Pin 2-4-6 And 8
Rehot Ucp 300
See Picture Below
Hints on troubleshooting touch screen failure on Samsung Gt-S7562:
This will work if you already tried replacing the touch screen module and restoring device firmware.
1.Check/clean the touch screen pin connector, re-solder it if necessary.
2. Check/read the touch screen supply voltage (VIO 1.8V) across to the filter coil.
If the voltage is missing check/replace the 0 ohms resistor, or apply a jumper if the line paths is open or cut.
3. Trace the RESET and PINT DAV line paths. apply a jumper if connection is open or cut.
4. Rework, re-ball or replace the Touch Controller chip.
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