Thanks!Imoudu.O

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Albert, Thanks for info but this marker pens does not have shelf life so repair is not economical.

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Albert,I Used Normal Pencil.

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Thanks! Anthony Paterson for your comment.
This is environmental effect where you have heavy humidity weather this type of problem is happen ,Keypad traces are coated with some conductive substance which get degraded because of either heavy use or environment effect.i found 50% problems in IR Remote is keypad contacts & others are of batteries, i never came across circuit failure till the date.About a long term repair.....it works in my cases.

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Thank you! Sir,
I was using the trick from school time, Once my father gave me his Casio Calculator for get it repair,i went to near by watch repair shop & there i saw this trick.
sometime real time Practical experience taught you something out of the box.

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Thanks! Imran

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In the past I found a much better fix after I found a cheap gold marker pen on Aliexpress that better sticks onto those rubber/silicon pads. Other marker pens are still available like these that probably also work.

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