Page 38 - Electronic Mechanic - TP - Volume - 2

ELECTRONICS MECHANIC - CITS

TASK 3: Dismantle the cell phone and identify the power section

STEP1:- Switch OFF the cell phone and remove the battery cover and back facial of the cell phone.
NOTE :- The screws must be kept very carefully for reassemble the cell phone
STEP 2:- Remove the battery, SIM card and memory card carefully.
STEP3:- Using suitable screwdriver, unscrew and remove all the screws and keep them in a safe box.

STEP4:- Once all the screws are open, remove the front cover or the front fascia of the mobile phone.
NOTE:- The phone PCB is attached with the internal fasica or skeleton of the mobile phone using screws.
STEP5:- Unscrew and open all the screws of the main assembly.
NOTE:- Safety: It is very delicate part, handle with care.
STEP6:- Remove connectors for display, camera and pull the display and the camera out as shown in Fig.6.

Fig 6

STEP 7:- Identify the power IC, and other supporting ICs
STEP 8:- Record the IC numbers/details in Table-1.
STEP 9:- Get the work checked by the instructor.

NOTE: The IC around which there are several capacitors is called power IC. In some cell phones
there are 2 power ICs.

TASK 4:- Test the healthiness of cell phone power
STEP 1:- Keep the battery separately and set it down on flat surface such that the terminals are facing you.
STEP 2:- Note the specification of the battery and identify the two terminals on the battery that are labeled with
‘+’ and ‘-’ sign as shown in Fig.7
STEP 3:- Measure and record the battery voltage, using multi- meter in Table-1.
Table 1
Sl. No. IC NO. Function Remarks

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CITS : E & H - Electronics Mechanic - Exercise 124 CITS : E & H - Electronics Mechanic - Exercise 124