Fault Detail: when we power on mobile nokia7210c it gives white display or no display problem.
There are two ics in nokia 7210c for dilplay.If any ic damage then this problem creates, also if lcd point damaged cause this problem.To solve this problem first check lcd or replace lcd with new one, then rehot or replace display ic.Check the lcd connector if there is carbon then clean carbon with ctc 
7210c lcd ways diagram

and apply normal heat.Final solution for this problem is jumpering, here i attach diagram for ic jumpers, Observe diagram carefully and do jumpers like diagram below.

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