Cellphone Tips

Cellphone

Tools material & test equipment

1.) P2 – Pentium III, IV
2.) Software – Dejan / twister / job flasher or tornado
3.) Power Supply Regulator
4.) Plate maintenance
5.) Schematic diagram
6.) Magnifying lamp
7.) Nokia to I set = T6 – T5
8.) T6 Precision
9.) T6 screw kit
10.) Hot – Air
11.) Soldering Iron – 20 wats
12.) Soldering Stand
13.) Soldering LEAD – 0.3
14.) Magnetic wire #35 use for jumper (if needed)
15.) Jumper Wire – 0.1
16.) Tester – Samwa – local / SAL – original
17.) FLUX – RM – 223 volume : 10cc
18.) Lacquer thinner = 30% Lacquer 70% water
19.) Brush
20.) Eraser
21.) Cleaning Solution
22.) Cotton Buds
23.) Long Nose
24.) Cutter


Hot Air

Reheat
• 2.5 – air
• 3 – Heat

Before Reheat
Then remove apply the Flux of components

Remove
• 3 –AIR
• 3.5 / 4 – Heat

Liquid Flux Remove Heater



Cellphone parts component & familiarization

1.) Speaker
2.) Microphone
3.) Buzzer
4.) Vibrator
5.) Simcard Connector
6.) External Interface
7.) Terminal Battery
8.) Battery
9.) LCD // LCD Frame
10.) Flex / Rubber / Metal Connector
11.) Antenna
12.) Antenna Switch
13.) Pa-Power Amp
14.) Rx – Incoming or Receive / Tx Filter – Outgoing
15.) VCO – Voltage Crystal Oscillator
16.) RF / IF Filter – Processor
17.) Audio IC = Incoming or Outgoing
18.) Charging IC
19.) Power IC
20.) UI
21.) RAM = Random Accessories Memory
22.) ROM = Read Only Memory
23.) EEPROM = Electrically Erasable Programmable Read Only Memory
24.) Flash
25.) CPU = Central Processing Unit
26.) R = Resistor
27.) C = Capacitor
28.) DV. = Diode
29.) QV. = Transistor
30.) Fuse (F.)
31.) Inductor Coil
32.) Rubber Button Switch
33.) Switch (S)
34.) Transformer coupler


BG – Reworking

Tools
1.) Hot-Air
2.) Soldering Iron
3.) BGA Plate
4.) BG Paste
5.) Flux
6.) Lacquer
7.) Cotton Buds


Cause
1.) Remove the BG IC on PCB by using Hot – Air / Tweezer
2.) Clean the BG IC/PCB by using soldering iron
3.) Top the BGA IC on the BG Plate then apply BG paste by using Spatula
4.) Cook by Hot-Air


How to read schematic Diagram

Cause
1.) Look the actual Board then check the Location of components.
2.) Go to the black diagram then check the numbers of components
3.) Go to the Schematic Diagram then trace the line of components
Ex: switch – use to open / close the circuit


No Power

1.) Check the battery
2.) Check the terminal Battery
3.) Clean the PCB
4.) Software
5.) Check the continuity trace open pattern before IC
6.) Power IC
7.) RAM
8.) ROM
9.) Flash
10.) CPU


Hang / Hanging

1.) Software
a.) Reprograms
b.) Reformatting

2.) Hardware
a.) Power IC
b.) Memory IC
Ex. Try to Reheat

Formatting Manual
(Nokia)

1.) Press #* call 3
Ex. Then power switch / Phone state off

2.) *#7370#
3.) Enter your Sec. Code
Ex. 12345
Then rest clock yes format… / Phone state ON

Restart *3370#
Serial No. *#06#



Keypad Malfunction

1.) Check the keypad
2.) Check the keypad Mating (Foil)
3.) Clean the terminal Tip.
4.) Alignment
5.) Check the continuity trace open pattern before IC
6.) Resistor
7.) Transistor
8.) Power IC
9.) Flash
10.) CPU


No Earphone

Cause
1.) Check the Speaker
2.) Alignment
3.) Clean the terminal Tip.
4.) Check the continuity trace open pattern before IC.
5.) Inductor Coil
6.) Resistor
7.) DCT3 – cobba
8.) DCT4 – VEM


No Microphone

1.) Check the Mic
2.) Alignment
3.) Clean the Terminal Tip
4.) Check the continuity
5.) Resistor
6.) DCT3 – COBBA
7.) DCT4 – VEM


Not Charging

1.) Not charging w/ warning sign
2.) Not charging w/out warning sign

a.) Check the battery
b.) Check the terminal Battery
c.) Alignment
d.) Clean
e.) Check the continuity trace open pattern before IC
f.) Fuse
g.) Inductor coil
h.) Charging IC
i.) Power IC
j.) Flash
k.) CPU



Insert SIM

1.) Check the SIM
2.) Check the SIM connector
3.) Clean terminal Tip
4.) Alignment
5.) Software
6.) Check continuity trace open pattern before IC
7.) Transistor / crystal IC
8.) Resistor
9.) Capacitor
10.) Power IC reheat
11.) Flash IC reheat
12.) CPU IC Reheat


No Display

1.) Check the LCD
2.) Check the rubber/ metal / flex connector
3.) Clean the terminal
4.) Alignment
5.) Software
6.) Check the continuity
7.) Capacitor
8.) Power IC
9.) Ram flash
10.) CPU


No Ringtones

1.) check the buzzer
2.) alignment
3.) clean terminal tip
4.) check the continuity
5.) inductor coil
6.) Dct3 – UI
7.) Dct4 – UEM



No Signal

1.) Check the simcard
2.) Clean the pcb.
3.) Alignment
4.) Check the antenna
5.) Antenna switch
6.) PA. “Power Amp.”
7.) RX / TX Filter
8.) Transformer coupler
9.) VCO
10.) RF Processor
11.) Audio IC
12.) Power IC
13.) Flash
14.) CPU