After dis assambly of nokia asha 203 replace LCD and check the display. If replacement of LCD can not solve display problem in nokia asha 203 you can check water damages in the mother board.
If mother board is wet or having water damages and carbon on it. Clean the nokia asha 203 mother board with electronics cleaner and apply hot air to make it dry. Do not apply much heat it can be dangerous for you skin or can damage the mother board of nokia asha 203.
Lcd display jumpers are given in different colors in above display repairing diagram of nokia asha 203. Check these lcd display repairing tracks and if any of them is missing apply these jumpers to solve display problem in nokia asha 203.
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