Mobile Cell Phone Repairing | Mobile Phone Repair Guide, Help, Tips, Pictures, Videos, Hardware, Software Solution

How to Clean Points and Connectors of Mobile Phone PCB

When doing mobile cell phone repairing, you will often have to clean several points and connectors. Cleaning of points and connectors is done to clean and remove dirt and oxides from solder joints, PCB circuit tracks and the PCB itself. These dirt and oxides (often copper oxide and carbon oxide) act as resistance and hindrance to flow of current thus affecting the performance of the mobile phone handset.

Tools Needed to Clean Mobile Phone Points and Connectors:


How to Clean Points and Connectors of Mobile Phone PCB (Printed Circuit Board)

Mobile Phone PCB

Mobile Phone PCB

  1. Disassemble the mobile phone and take out the PCB
  2. Fix the PCB to a PCB holder that can hold it firmly.
  3. Using a PCB cleaning bud or ESD-Safe Brush and IPA solution or PCB cleaner, clean the points and connectors on the PCB.
  4. You can also use tweezers to clean the points and connectors.
  5. Similarly you can clean the whole PCB of the mobile phone and other parts and components in a mobile phone.

Have a look at following videos to learn and understand how to disassemble a mobile cell phone and how to clean points and connector of a mobile phone PCB.




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Mobile Phone Parts Identification | How to Identify Parts & Components on PCB of Mobile Phone

When learning how to repair a mobile cell phone, it is important to learn how to identify parts and components on the PCB of a mobile cell phone. Identification of these parts and components is not that difficult.

The PCB of any mobile phone of any brand namely Nokia, Samsung, Motorola, China Mobile Phones etc is divided into 2 Parts namely: (1) Network Section; and (2) Power Section. When identifying parts, electronic components and ICs on the PCB of a mobile cell phone, it is important to keep these two sections in mind.


How to Identify Parts and Components on the PCB of a Mobile Cell Phone:

  1. Antenna Point: The point where antenna is connected is called antenna point. It is normally located at the top of the PCB of a mobile phone.

Network Section: The section below antenna point and above power section is called network section.

  1. Antenna 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 antenna switch is merged with PFO.

    Antenna Switch of Mobile Phone

    Antenna Switch of Mobile Phone

  2. PFO: Power Frequency Oscillator. It is present beside the antenna switch.

    PFO of a Mobile Phone

    PFO of a Mobile Phone

  3. Network IC: It is below or beside the antenna switch and PFO. In some mobile phones, the Network IC is merged with the CPU. E.g.: Nokia 1200, 1650, 1208, 1209 etc.

    Network IC of a Mobile Phone

    Network IC of a Mobile Phone

Power Section: This section is below the Network Section.

  1. Power IC: In the Power Section, the IC around which there are several brown-colored capacitors is called Power IC. In some mobile phones there are 2 Power ICs.

    Power IC of a Mobile Phone

    Power IC of a Mobile Phone

  2. CPU: Central Processing Unit. In the power section, the largest IC is the CPU. In some sets there are 2 CPU.

    CPU of a Mobile Phone

    CPU of a Mobile Phone

  3. Flash IC: This IC is found beside the CPU.

    Flash IC of a Mobile Phone

    Flash IC of a Mobile Phone

  4. Logic IC: The IC with 20 legs is the Logic IC.

    Logic IC of a Mobile Phone

    Logic IC of a Mobile Phone

  5. Charging IC: In the Power Section, the IC beside R22 is the Charging IC.

    Charging IC of a Mobile Phone

    Charging IC of a Mobile Phone

  6. Audio IC: The IC parallel to Power IC is the Audio IC.

    Audio IC of a Mobile Phone

    Audio IC of a Mobile Phone

NOTES:

  1. UEM (Universal Energy Manager) = Logic IC + Charging IC + Audio IC + Power IC
  2. PFO (Power Frequency Oscillator) = Antenna Switch + PFO
  3. Flash IC= RAM + Flash IC

    Mobile Phone PCB Layout Diagram

    Mobile Phone PCB Layout Diagram



Related Posts:

Mobile Cell Phone Repairing | Mobile Phone Repair Guide, Help, Tips, Pictures, Videos, Hardware, Software Solution Mobile Phone Repairing | How to Repair any Mobile Cell Phone including Nokia, Samsung, Motorola, China Mobile Phones, Sony Ericsson, LG and all other Mobile Phone. Includes Mobile Cell Phone Repairing Photos and Diagrams, Repairing and Service Tips, Tricks and Solution for Problems like – Speaker or Earpiece, Headphone, Mic or Microphone, Signal Problems like No Network, Charging Problem or Mobile Phone Not Charging, Motor or Vibrator, Ringer or Buzzer, Camera, Display, Screen, PDA, LCD, Power Button, Bluetooth, Infrared, Antina or Antenna Switch, Hand Free , Key Pad Not Working, Joy Stick Fault, Insert SIN or No SIM, Light Problem, No Power or Set Dead. Also included is How to Load Software (Flashing) to any Mobile Phone and Other Hardware and Software Problems and Solution.

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