a. Check on/off switch
b. Check battery voltage
c. Check if it can charge
d. Bad power IC
e. Do cross connection
Use computer software to flash it. If it is a Nokia phone just follow this link and read my previous post on how to flash a Nokia phone.
2. Keypad Problem
a. Clean the keypad interface on the circuit Board
b. Check if there is continuity on the interfere
c. Replace key with known working one of same make and model
a. Quickly removes cell battery
b. Dismantle phone and allow it to dry
c. Use methylated spirit to clean power contact
Use hot air blower (Excellent alternative to dry the main board and park it back )
4. Battery drains faster than it supposed to.
If the battery is new charge it for two or three hours to normalize performance. If is an old battery read from the voltage to know the capacity. If the area is short of network coverage and unless the user leaves the area, the battery will always drain faster.
Some phones that uses 3G, 3.5G, and 4G…. YOU CANT ESCAPE THIS PROBLEM WHEN THIS NETWORK FROM IS ACTIVE.
5. Blinking of Screen
This problem could be caused by the flex of a phone, not firm the main LCD. To solve this change the flex.
6. Blinking of network
Check the environment you are if there is enough coverage capacity to receive network.
7. Phone not charging
a. Confirm the charger is working by reading the output voltage with meter.
b. Check the fuseable resistor and replace if broken.
c. Check the charging point tag to see if it has removed from the board add a soldering lead to clear the problem.
If your phone has any of these problems and the solutions provided cannot solve it then go to your nearest phone Engineer to help you out.
Remember to comment before you leave, We appreciate your comments