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Keypad Button Keypad Connector Display Display Connector www.
Antenna PCB www. Antenna Point: The point where anteena is connected is called anteena point. Network Section: The section below anteena point and above power section is called network section. Anteena Switch: It is found in the network section.
It is made from metal and non-metal. It has 16 points or legs. In some mobile phones, the anteena switch is merged with PFO.
PFO: It is present beside the antenna switch. Power Section: This section is below the Network Section.
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In some mobile phones there are 2 Power IC. In some sets there are 2 CPU.
Work: It searches network and passes forward after tuning. Faults: If the Anteena Switch is faulty then there will be no network in the mobile phone.
It is also called P. Work: It filters and amplifies network frequency and selects the home network. Faults: If the PFO is faulty then there will be no network in the mobile phone.
If it gets short then the mobile phone will get dead. It is also called RF signal processor. Work: It works as transmitter and receiver of audio and radio waves according to the instruction from the CPU. Sometimes mobile phone can even get dead.
It is also called Network Crystal. It is made up of metal. Work: It creates frequency during outgoing calls.
Faults: If this crystal is faulty then there will be no outgoing call and no network in the mobile phone. It also creates frequency after taking command from the CPU.
Work: It filters frequency during incoming calls. Faults: If it is faulty then there will network problem during incoming calls.
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Work: It filters frequency during outgoing calls. Faults: If it is faulty then there will network problem during outgoing calls. Work: It loads current operating program in a Mobile Phone. Faults: If ROM is faulty then there will software problem in the mobile phone and the set will get dead. Work: It sends and receives commands of the operating program in a mobile phone.
Faults: If RAM is faulty then there will be software problem in the mobile phone and it will get frequently get hanged and the set can even get dead. Work: Software of the mobile phone is installed in the Flash IC. Clean the keypad and keypad points shown in Figure 38 below.
Row Figure Keypads and keypad points 3. If there is a beeping sound then the keypad is working.
If still no change, heat, reball or change the CPU. Page 39 Mobile Phone Repair and Maintenance Take Note: If you press a key and it takes a long time to work, then you should reload the software to solve this problem. In all Nokia mobile phones, if none or only a few keys are working, then you should change the keypad IC to solve the problem. It has a unique serial number. The SIM works for sometime and then stops working.
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Check settings and see if the mobile phone is in Flight Mode. If it is in Flight Mode then change it to Normal mode.
If the problem is not solved then change the SIM card and check. If the problem still persists then change the SIM connector. If you still do not find a solution to the problem, check the Track of the SIM section. Finally, if there is no change, heat, reball or change the Power IC.
Check the BSI Point of the battery. The middle Pin is the BSI point. Change the battery and check.
Enable Wi-Fi and check if it is working or not. Make sure you are connected to a wireless network.The point where anteena is connected is called anteena point.
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