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This solution may used to troubleshoot and repair a damaged Nokia 7230 that result Display problem issues like white Lcd, blue Lcd, blank or black Lcd, garbled and saturated Lcd displays that is not due to LCD Screen Display Module problem.
This solution may possibly help fix and repair Nokia 7230 after ensuring that the LCD Lcd display module is working okay and or already tried installing it a new replacement spare LCD module.

The solution above shows the Line tracing spots from the LCD flex pin connector to a certain components On Nokia 7230 PCB Board. You may check and trace this line tracks and check the corresponding components connected to it. If all the line tracks is okay. You may then suspect that the application processor or CPU is faulty or being damaged.
Please take note that handling CPU IC is  complicated and needs expertise, so observed extra precautions.