mediacom g501 service manual

N501 C t S iN501 Customer Service Manual

Ⅰ. Mobile phone Introduction1. Features Android4.4 Capacitive Touch screen

/ / / / FM radio /Bluetooth/WIFI/GPS/

2. Product CharacteristicsPl f MTK6582M Platform :MTK6582M

MCP:4GB ROM＋512MB RAM (Option:8GB+1GB)

Operate Frequency: GSM 850/900/1800/1900MHZ & WCDMA 900/2100MHZ or 850/1900/2100 or 850/1700/1900850/1900/2100 or 850/1700/1900

Dual SIM :Dual SIM dual standby Display: 5.0 inch FWVGA IPS 480*854 Camera : Back 5.0MP +Front 2.0MPCamera : Back 5.0MP Front 2.0MP Extend T-Flash Card support

3 Specification3. Specification

Size: 142.9*72.6*9mm (L*W*H)

Color: Black

Keypad :NO

Side Key:2 keys (volume key/ power key)

Antenna: Internal RF&BT,WIF&GPS; External FM, ;

Earphone:3.5mm jack

Battery:2200mAh

USB t Mi 5 i USB USB port: Micro 5pin USB

Electroacoustic part:1 mic.,1 spk., 1 vib. 1 Receiver (option: Piezo)

Ⅱ Examination functionⅡ. Examination function

1、IMEI examination order

Inputs the *#06# instruction to check the IMEI NO. inside mobile phone

2、Testing order

Inputs the *983*0# to test all normal functions

3、Download cable

Just use the usb cable to download sw

Ⅲ.Testing and Repair ToolsⅢ.Testing and Repair Tools CMU200 or 8960

DC POWER SUPPLYDC POWER SUPPLY

Oscillograph

Hot gun

Electric iron

Stroboscope

Screwdriver(electromotion) Screwdriver(electromotion)

UP-1024 super speed universal programmer

Disassemble toolsDisassemble tools

Multimeter

CMU200 or 8960 DC Power Supply OscillographCMU200 or 8960 DC Power Supply Oscillograph

Hot gun Electric iron Stroboscope

Screwdriver(electromotion)UP-1024 super speed universal programmer

MultimeterDisassemble tools Disassemble tools MultimeterDisassemble tools Disassemble tools

Glove Soldering tinFabric

Alcohol bottle

Brush fixed clampBrush

Ⅳ.Circuit Chipset/Instructions

CPU:MT6582M (Four Cortex : 1.3Ghz)

MCP:4GB ROM+512MB RAM(option:8GB ＋1GB )

Power management: MT6323Power management: MT6323

Multimedia:MT6627（WLAN+GPS+BT+FM 4 in 1 IC）

/RF:3G/2G quad-band transceiver MT6166+Power Amplifier SKY77590+SAW +SMD Crystal

TOPGSM PA U401

Battery connector XJ703

Earphone connector

USB connector XJ701

Back camera connector XJ903

CPU U501 MT6582

P U601

Front camera connector XJ908

XJ711

MCP U602

Power manage U601 MT6323

BOT

SIM 1 connector XJ707

SIM 2

TP connector XJ1006

connector XJ708

TF connector XJ706

LCD connector XJ902XJ902

MT6323 managementdiagram circuit:

Charger circuit:Charger circuit:

SIM card circuitSIM card circuit

TF-Flash card circuitTF-Flash card circuit

MIC circuit

Earphone connector circuit

Speaker circuitSpeaker circuit

Battery connector

Camera connector circuit

LCD connector circuit

TP circuit

G-SENSOR circuit

MT6627 circuit(WLAN+GPS+BT+FM 4 in 1 IC)

Ⅵ、Troubleshooting of the problem:Ⅵ、Troubleshooting of the problem:1.Cann’t download software repair guidance2 No power on repair guidance2. No power on repair guidance3. Display Problem (blank display ,white display) repair guidance4. No ring repair guidance5 Audio problem repair guidance5. Audio problem repair guidance6. Camera problem repair guidance7. TF card problem repair guidance8 SIM d bl i id8. SIM card problem repair guidance9. Can’t charge repair guidance10. No vibration repair guidance11 TP bl i id11. TP problem repair guidance12. MT6627 (WIFI\GPS) repair guidance13. FM Can not search signal14 N i l14. No signal

Cann’t download software repair guidance

Cann’t download

YES

Check the files to select from software package Re-download

NO

Y

NO

Check VBAT、VCHG voltage Solder or replace Power management MT6323

NO

Y

NO

Check USB connector if have short circuit or open

circuitSolder or replace usb connector

Y

NOCheck clock frequency32.768kHz (700mV )or

system clock 26MHz(600mV)

Solder or replaceY

NO

Check CPU(MT6582) and circuits round Solder or replaceY

No power on repair guidance

No power on repair guidance

Y

Check the power button,Re-download software

NN

Check if have any creepage,If VBAT、VCHG is short circuit,

If have ESD was damageSolder or replace

N

Y

N

Check if have KEYON signal after press power

key

Solder or replace Power management MT6323Y

yN

Check clock frequency32.768kHz( 700mV)

System clock 26MHz (600mV)Solder or replace

Y

NN

Check CPU( MT6582)Or circuit round Solder or replace

Y

Display Problem (blank display ,white display) repair guidance

Display Problem (blank display ,white display)

Y

Check LCD is ok or not Replace LCD to test

N

Y

N

Check LCD Connector if have any short solder etc Solder or replace XJ902

N

Y

N

Check Backlight circuit U901 Solder or replace U901Y

N

check MT6582 Solder or replaceY

No ring repair guidance

No ring or voice

Y

Check speaker if have assemble ok Repeat fixed

N

Y

N

Check speaker if have damage Replace to test

N

Y

N

Check speaker round circuit Solder or replace Y

N

Solder/replace

YCheck power IC MT6323

Check CPU MT6582 Solder or replace

NY

receiver problem repair guidance

Audio problem (Cann’t got voice when making call)

Y

Check Receiver FPC if have connect ok Repeat fixed

N

Y

N

Check Receiver damage or not ReplaceN

NN

Check receiver round circuit Solder or replaceY

Check CPU MT6582 Solder or replace

N

Y

Camera problem repair guidance

Cann’t take picture or mistiness

Y

Check camera if have damage Replace to test

N

Y

N

Check camera connector XJ903/XJ908 Solder or replaceY

NN

Check CPU MT6582 Solder or replaceY

TF card problem repair guidance

TF card not be identify

Y

Check TF connector is damage or not Solder or replace XJ706

N

Y

N

Check data \clock\power to TF connector Solder or replaceY

NN

Check CPU MT6582 Solder or replaceY

SIM card problem repair guidance

SIM card not be identify

Check Sim connector if have damage Solder or replace XJ707/XJ708

YY

Check Sim connector if have damage Solder or replace XJ707/XJ708

N

Ch k SIM d i i if h l MT6323 S ld lY

Check SIM card circuit,if have power supply MT6323 Solder or replace

N

Check and replace MT6582

Can’t charge repair guidance

Can’t charge

Y

Check battery connector and USB connector Solder or replace

N

Y

N

Check charge circuit Solder or replaceY

Solder or replaceY

Check circuit: Power supply MT6323

Solder or replaceCheck CPU MT6582

NY

p

No vibration repair guidance

No vibration

Y

Check assembly are in good condition Solder or replace

N

Y

N

Check whether the motor cable ifdisconnection or not Solder or replace

Y

NN

Check power supply MT6323 Solder or replaceY

TP problem repair guidance

No TP function

Y

Check TP FPC if have connecting Repeat fixed

N

Y

N

Check TP if have damage ReplaceY

NN

Solder or replaceY

Check connector circuit XJ1006

Check CPU MT6582 Solder or replaceY

N

MT6627 (WIFI\GPS) repair guidance

MT6627 Chi i i WIFI\BT\FM i iMT6627 Chip inteqration WIFI\BT\FM circuit。

GPS/WIFI can’t work

Check BT and WIFI address Write the address

YY

N

Check the antenna contacts are in good condition replaceY

N

Check chip(MT6627) Solder or replaceY

FM Can not search signal

Y

Check antenna connect circuit Solder

N

Y

N

Check earphone or earphone connector Solder or replaceY

N

Check MT6627 Solder or replaceY

2.RF circuit

No signal

Check whether the antenna connection is good replaceY

Check RF PA Solder or replace

NO TX

Y

N

Check circuit round Solder or replaceY

N

Check Filter circuit,26M OSC circuit Solder or replaceY

Solder or replace

N

Y

Check RF transceiver MT6166 Solder or replace

N

Check CPU MT6582

Ⅴ Di blⅤ. Disassembly1 Open the battery cover as below1.Open the battery cover as below

Camera lens

Battery cover

2. Take out cover of bottom as below2. Take out cover of bottom as below

Battery cover

3. Take out 12 screws with Screwdriver as below

4 S t f t d b l4. Separate front case and rear case as below:

Rear caseVolume key

Power key

5 T k t M i PCBA f f t5. Take out Main PCBA from front case

1) Remove the fixed 4PCS screws

2)Disassembly components from main PCBA) y p

Speaker

Motor

TP FPC

Keypad FPC

LCD FPC

MicrophoneMicrophone

3).Take out Main PCBA from front case

Main PCBA

Front case

6. Remove those components(speaker, motor, microphone, keypad FPC) from main PCBA

speaker

motorKeypad FPC

microphone

Remove front camera ,back camera from main PCBA

Back camera Front camera

7. Disassembly components distribution as below

i

Rear caseFront case

receiver

Main PCBA

Touch panel

Mic

Battery cover Back camera

Front camera Power key FPC

motor

speakerVolume keyPower key

8. Disassemly TP&LCDDisassembly the mobile phone to front housing subassembly only (just have LCD/touch lens/front housing) then along the round(black area) on Touch lenshousing), then along the round(black area) on Touch lens to heat even about 20seconds with Hot Gun as below pic

9.once finished to heat up by Gun. take the Guitar p yplectrum insert the gap between Touch lens and front housing (take care :the Guitar plectrum didn’t be insert too deep ,or will hurt the LCD). then prize the touch lens along the round as below picg p

1 2

3 4

THE ENDTHE END