This is Nokia C1 light problems solution.Many time may be damage nokia C1 lcd and keypad light.when damage light part then no light on the phone.lcd light and keypad light connected with series line so problem  any line then no light. first check light positive volt on the capacitor.if you see no voltage on the capacitor then check light ic and coil.damage any parts replace that parts.If 10v or more voltage have on the capacitor but problem then check light ways.

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