Replace the ringer and check if it is working good. Nosie in ringing can be due to ringer problem. Look at diagram above this diagram have some tracks to solve nokia asha 202 ringer problem solution.
A diagram that is attached with this post this diagram have two different color lines that are identifying tracks and parts that are used in ringer function of nokia asha 202.You can check all these components with meter and apply jumpers if any of them are missing or damage.
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