In nokia 501 light problem occur due to water damage or rust or carbon. so if you are facing light not working hang problem then look at the diagram given bellow it will help you to solve these problems.
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First See Your Phone Pcb For Some Rust Or Carbon Clean Whole Mother Board Of Your Phone With Any Good Cleaner For Water Damage.Apply Low Heat With Tour Hot Air Gun And Keep In Mind It Should Not Be To Much Because It Can Be Damage The Mother Board Of Your Phone.
Here Are The Solution Please Ovserve Carefully.
If your lcd display is proper but only light is not working you should have focus on these two lines and check there path and parts.If you find any missing part or damage part then apply jumper there.
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