FLY E155 Service Manual

E155 Service Manual

Prepared by：Jianing Wen
Approved by：
Date：2010.7.2

1 Overview E155

cacy

1.1 About E155 Phone

1.2 Distribution of the mainboard components

2 RF

2.1 RF Overview

2.2 Transmit

2.3 Receive

2.4 Common RF Malfunction

3 Baseband

3.1 Baseband Overview

3.2 Logic

3.3 Power management

3.4 Baseband common malfunction

4 Reference for maintenance

4.1 No power on

4.2 Shut off automatically

4.3 Dead halt

4.4 No charge

4.5 Quantity of electricity faulty detection

4.6 No display

4.7 LED NG (on the LCD)

4.8 LED NG (on the key board)

4.9 Key NG

4.10 No ring

4.11 No receiving voice

4.12 No sending voice or the voice is small

4.13 No vibration

4.14 Card inefficacy

4.15 Camera inefficacy

4.16 Bluetooth circuit(MT6612)

4.17 TF card inefficacy

4.18 Earphone inefficacy

4.19 FM inefficacy

4.20 G-senser ineffi

1 Overview E155

1.1 About E155 Phone

E155 mainboard is based on the MTK platform designed to support 2-band

which supporting the FM and Bluetooth calls and transmission, and Wifi,
the mainboard system consists of the base-band （CPU：
MT6235+TY9A0A111179KC40） and the RF (MT6140+SKY77546).

1.2 Distribution of the mainboard components

TF Card

Audio PA

CPU

MT6235

Wifi

Battery CONN

S200

Adapter CONN

Blue toothes

Antenna connecter

MT6212

TY9A0A1111
79KC40

Flash

SIM1

Socket of SIM card

SIM2

Earphone CONN

MOT

Camera connecter

TP connect interface

K/B FPC

LCD

FM

Transceiver

RF PA

MT6140

SKY77546

MIC

AR1010

Receiver

MMA7660FC

3D G-Sensor

2 RF

2.1 RF Overview
RF part mainly consists of transceiver MT6140 (adopts program of near-zero IF

receiver, supporting the EGSM / DCS and 26M VCTCXO as the clock input,
integrated clock buffer, LO VCO and TX VCO and regulator, only need for
external connections of VBAT / AVDD), SKY77546 (it supports EGSM / DCS
and integrated automatic power control and transceiver switch).

Transceiver (MT6140) with the RF modulation and demodulation functions

contains IF frequency synthesizer and VCO RF, which is part of the core
component of the RF. PA has a major role in amplification of modulation
signal, and it must be controllable and the speed should meet the GSM
agreement.

2.2 Transmit
TX is composed of the modulation loop, power amplifier and antenna

switch. PLL is mainly in the internal MT6140, I / Q signal first
enters into the MT6140, after entering the PLL the signal is
modulated to RF, and then it outputs from the chip to PA, converts
into electromagnetic energy through antenna by the antenna

switch after enlarged.
PA:
This part adopts voltage control to achieve and its role is to amplify

the signal power in accordance with the requirements. It is divided

to two different power levels through VRAMP signal. The transmit

signal of GSM is 5 to 19, power is from 3.2MW to 2W while DCS is

0 ~ 15, power from 1MW ~ 1W. PA is time-sharing work controlled

by TX-EN chip, the output power of PA is controlled by VRAMP

(APC) through the voltage. PA is intermittent work, by the BS to

achieve the choice of frequency bands.

2.3 Receive
Antenna RX - MT6140 (RX_VCO mixer) - band-pass - Amplification -

filter - Amplification - RX_VCO mixer - CPU

2.4 Common RF Malfunction
Detection and Maintenance Flow Chart of MS Transmit malfunctio

3 Baseband

3.1 Baseband Overview

E155 Baseband consists of CPU MT6235 and Program Memory. UMT6235
baseband, the core device of the mainboard, is responsible for the normal work
among various parts of mainboard, such as voice processing, image processing,
power management as well as MS communications.

UMT6235 digital baseband contains 32-bit ARM7E core and 284Kbyte SRAM.
MT6235 which is an enhanced GSM Processor integrated Channel Codec
subsystems interiorly including Channel Codec, Intertlace / Deinterleave,
Encryption / Decryption and Control Processor subsystems including ARM7EJS
and its peripheral circuits. There are 26 address lines,16 data lines, 8 chip select
lines, provided 6 external interrupt Interface, 26M/52M operation clock.

Analog baseband contains UMT6235 analog baseband chip, audio, baseband
codec and power management. Four major functional blocks integrated internal:
Audio codec including Voice input / Output channel, Buzzer output; Baseband
codec including Differential I, Q input / output, GMSK modulation and A / D, D / A;
Auxiliary parts including AFC DAC, RAMP DAC, AGC DAC and a seven-channel
A / D. And WATCHDOG interface is set internal to enhance the stability of the
system.

3.2 Logic

Logic part is composed of MTK base-band management chip UMT6235, power
management chip MT6235 and Nand Flash.

 UMT6235：CPU
 Nand Flash：TY9A0A111179KC40
 MT6235：PMU

3.3 Power management

Power management consists of the charging circuit integrated in MT6235 and the
external charging circuit. It provides 11 road LDO voltage. Besides, it completes
the logic level conversion of SIM card. The chip also outputs the system reset
signal.

Boot process:
The normal boot is to press boot key which is that the PWRKEY is being dragged down.
Once the boot key is pressed, all LDO are open except VSIM. After VCORE opening RESET
timer and timer out, RESET is being pitched up to start the digital baseband chip, that is,
UMT6235 starts to run and roll polling its ROWX pin, pitch up its PWRONIN pin, then you can
release the boot key. This is the initial boot process.

3.4 Baseband common malfunction

3.4.1 Nand Flash programming does not download

Data lines used for downloading software: VBAT, TX, RX, GND, CHARGE. It is
mostly due to the false solder and wire bonding. First check whether the serial port
of PC and cell phone is unrestricted, if not, it is caused by being lack of devices or
empty solder of power manager, USB-con and peripheral resistance. Measure the
TX, RX signals by using AC-coupled oscilloscope to track the signal flow, if a
certain period circuit of no signal it may be AC short circuit to ground, or is caused
by a short circuit and open circuit. On checking the malfunctions, first should
carefully observed the welding of these devices with a magnifying glass, then plug
in the download line to observe whether the current is normal, there is short-circuit
to ground of VCHG or VBAT if the current is large, at this time cut off power supply
as soon as possible, and then find the short-circuit point. It may be the abnormal
output power supply of a certain circuit that the current is larger than normal
(about 30 mA) but not particularly large, at this time should check whethe the
valgate of VCORE (1.8V), VDD (2.8V), VADD (2.8 V), VTCXO (2.8V), VRTC
(1.5V), VMEM (2.8V) is noamal, if not, bad welding can be detected. Focus on
checking the welding of PMU and USB-CON if there is a little or no current.
Unplug and re-plug the download line to see if it is caused by poor contact; It can
test that whether the output of 26MHz clock signal to the CPU is normal by using
oscilloscope.

3.4.2 Detection and Maintenance Flow Chart of No download malfunction

4 Reference for maintenance

4.1 No power on

No power on

Check whether the

battery voltage is

higher than 3.4V

Y

Check whether the battery
and the key pad of J404 is

oxidized or there is

anything else on it

N

N

Y

Charge the battery

Wipe off the thing

or clean the key pad

Check whether the

connection of K/B &

M/B is OK

N

Take out the LCD and

SPK, Check whether it is

powered on

N

Y

Y

reweld the K/B

Cross-testing the

LCD&SPK,

Change the defective

C1128:1.8V,

C1139:1.25V,

C1131:2.8V,
C1132:2.8V,
C1133:2.8V,

Check whether

R1114,D4413,D4432 is

broken

N

Connect with the battery,

press “NO” key, check

whether the output voltage

of U1100 is normal

Y

Check whether the

output frequency of

X1100 is 32.768K

Y

Change the

FLASH(U1302) of the

main module, check

whether it is OK

Y

NN

capacitor corresponding to

N

Change R1114,D4413,D4432

Replace a earthed

the defective pin, Check

whether it is OK

Change X1100，

Change U1100

C1105，C1106

N

Change U1302

OK

4.2 Shut off automatically

Shut off

automatically

D/L the latest edition,

Check whether it is OK

N

Replace with a

good battery, Check

whether the

primary cell is broken.

N

Check whether the

rubber, used to fix the

battery, is lost or at the

other location

N

Check whether the battery

and the key pad of J9435 is

oxidized or there is

anything else on them

Y

Y

Y

Y

ok

Change the battery

Reassemble the

rubber

Wipe off the thing

or clean the key pad

N

Check whether the

battery connector ‘J9412 is

void-welded or broken

N

Check whether the

connection of J9410,J9402,J9403

&K/B FPC is OK,FPC is

void-welded

Y

Y

N

Re-weld or

change J9412

Reassemble the K/B

Or change the FPC

Check whether X1100

output frequency is

32.768K exactly

Y

Refer to the maintenance

method of ‘No power on’

N

Change X1100，

C1105，C1106

OK

4.3 Dead halt

Death halt

D/L the latest edition,

Check whether it is OK

N

Replace with a good

battery, Check whether

the primary cell is broken

N

Check whether the
problem is resulted

from ‘KEY NG’

N

Check whether the
problem is resulted
from the LCD itself

Y

Y

Y

Y

ok

Change the battery

Clean the K/B,

reassemble or change

the metal dome

Change the LCD

N

Check whether the

output frequency of

X1100 is 32.768 exactly

Y

Check whether the

connection of J9410,J9402,J9403

&K/B FPC is OK,FPC is

void-welded

Y

Replacing with the

programming FLASH,

check whether it is OK

N

N

N

Re-weld or change

X1100,C1105,C1106

Reassemble or

change the FPC

Refer to the servicing

method of ‘No power on’

OK

4.4 No charge

No charge

Replace with a

good battery, Check

whether the

primary cell is broken.

N

Replace with a good

adaptor, Check

whether the primary

adaptor is broken

N

Check whether the

battery connector ‘J9412’

is oxidized or is broken

N

Check whether the

connector ‘J9411’ is

void-welded or

broken

Y

Y

Y

Y

Change the battery

Change the adaptor

Clean or

change J9412

Re-weld or

change J9411

N

Y

Check whether there

is anyone broken of

R1112

Y

Check whether there

is anyone broken of

Q1102,R1124

N

Change U1100, check

whether it is OK

N

N

Y

Change the defective

Change Q1102,

R1124(0.22ohm)

Change the

CPU(U1100)

OK

4.5 Quantity of electricity faulty detection

Quantity of electricity

faulty detection

Replace with a

good battery, Check

whether the

primary cell is broken.

N

Check whether there is

anyone broken of R1124

N

Change U1102, check

whether it is OK

N

Change U1100, check

whether it is OK

Y

Change the battery

Y

Change R1124

OK

4.6 No display

No display

Check whether changing
the LCD driver can solve

the problem

N

Check whether the

LCD is weakly

welded or broken

N

Change the CPU

OK

Y

Y

ok

Re-weld or

change the LCD

4.7 LED NG (on the LCD)

LED NG (on the LCD)

Check whether the

LCD is broken

N

Check whether U4400

are broken

N

Check whether there is

anyone broken of

R4401,C4412,C4413

N

Y

Y

Y

Change the LCD

Change u4400

Change the defective

Change the CPU

OK

4.8 LED NG (on the key board)

LED NG (key)

Checking method：

Crosstesting

the two sides of

LED by Multimeter ,

gearing to the short circuit,

if the LED is on at one

direction, it shows good.

Check whether there

is anything (or Mylar)

on the key

N

Check whether the

LED of the K/B is

weakly welded or

broken

N

Check whether the

connection of J9410

&K/B FPC is OK,FPC is

void-welded

Y

Y

Y

N

Clean or wipe off

the thing

Re-weld or

change the LED

Reassemble the K/B

Or change the FPC

Check whether the

resistor beside the

LED is broken

N

Y

Change the resistor

Check whether the

resistor of R2416

N

Change the CPU

OK

Y

Change R2416

4.9 Key NG

KEY NG

Check whether there is

anything oxidized or

smudge on the key pad

N

Check whether the

metal dome is oxidized

or broken

N

Check whether the

connection of J9410

&K/B FPC is OK,FPC

is void-welded

N

Y

Y

Y

cleaning the key pad

With YC336

Change the
metal dome

Reassemble the K/B

Or change the FPC

Check whether the

side-key is NG

N

Y

Chang the side-key FPC

Or the side-key metal dome

Check whether there

is anyone broken of

D4413-D4416

N

Change the CPU

OK

Y

Change the defective

4.10 No ring

No ring

Checking method：

testing

the resistance of the

SPK

by Multimeter, gearing to

the resistance, the

resistance of it is 8ohm

normally

D/L the latest edition,

Check whether it is OK

N

Check whether the

SPK is void-welded

or broken

N

Check whether it

has an output

voltage of 1.8V at

U3300 pinA3,C3

N

Y

Y

ok

Re-weld or

change the SPK

Y

Check B3302,B3303

Check whether the

voltage at U3300 pinC3 is

at the high level

N

Y

Change U3300

Check whether

B3300 is broken

N

Change the CPU

OK

Y

Change B3300

4.11 No receiving voice

No receiving voice

Checking method：

testing

the resistance of the

REC

by multimeter, gearing to

the resistance, the

resistance of it is 30ohm

around

D/L the latest edition,

Check whether it is OK

N

Check whether the

REC is void- welded

or broken

N

Check whether

B3320,B3321 are broken

N

Change the CPU

Y

Y

Y

ok

Re-weld or

Change the REC

Change B3320,B3321

OK

4.12 No sending voice or the voice is small

No sending voice

or a small voice

Checking method：

testing the resistance of

the MIC by multimeter,
gearing to the resistance,
the positive resistance of

it is 1K, the opposite is

0.8K around in general.

D/L the latest edition,

Check whether it is

OK

N

Check whether the MIC

rubber is broken or

displacement

N

Check whether the

MIC is weakly welded

or broken

N

Check whether there is

anyone broken of

B3304,B3305

Y

Y

Y

Y

ok

Reassemble or change

the MIC rubber

Re-weld or

change the MIC

Change the defective

N

Check whether there is

anyone broken of

R3310-R3313

N

Change the CPU

OK

Y

Change the defective

4.13 No vibration

No vibration

Checking method：

testing

the resistance of the

motor

by multimeter, gearing

to

the resistance, the

resistance of it is

22ohm in

general

D/L the latest edition,

Check whether it is OK

N

Check whether the

motor is locked by

displacement

N

Check whether the

motor is broken

N

Entering test mode,

Check whether it has an

voltage of R1308,B1320,

B1321,D1320,C1321

Y

Y

Y

Y

ok

Reassemble

the motor

Change the motor

Check R1308,B1320,
B1321,D1320,C1321

N

Change the CPU

OK

4.14 Card inefficacy

Card inefficacy

D/L the latest edition,

check whether it is OK

N

Check whether the
SIM card is broken

Y

Change the CPU

Y

Y

ok

Change the SIM card

OK

4.15 Camera inefficacy

Camera NG

Check whether the

camera is broken

N

Check whether the

FPC ‘J9407’ is

broken

N

Check whether U4405

pin5 has an voltage of

1.8V

Y

Check whether

E4406,E4407,E4408 are

broken

Y

Y

Y

Change the Camera

Reassemble J9407

Change U4405

Change E4406,E4407,E4408

N

Change the CPU

OK

4.16 Bluetooth circuit(MT6612)

Bluetooth is a design feature of this cellphone. It is with a matching Bluetooth headset and the
phone has a container which can charge up Bluetooth headset through the main board, to
accommodate Bluetooth headset. Some of the projects may not have this function, however, the
mainboard is compatible. Please first ensure that the power is correct, according to the
phenomenon and following schematic diagram to maintain the phone.

BT NG

D/L the latest edition,

check whether it is OK

N

Check whether the

BT antenna is

touched well

Y

Check whether

R5348 is voidwelded

or broken

N

Check whether

U5311,C5346 are voidwelded

or broken

N

Y

Y

Y

ok

Reassemble the

antenna

Change

R5348

Change

U5311,C5346

N

Check whether

U5312 has an output

frequency of 26M

Y

Change U5310, check

whether it is OK

N

Change the CPU

N

Change U5312

OK

4.17 TF card inefficacy

check whether it is OK

TF NG

D/L the latest edition,

N

Y

OK

Check whether the

socket ‘J9400’ is voidwelded

or broken

N

Check whether it
has an voltage of

2.8V at R4435-R4438

N

Change the CPU

Y

Change J9400

Y

Change R4435-R4438

OK

4.18 Earphone inefficacy

Earphone inefficacy

Check whether the

earphone is broken

N

D/L the latest

edition, Check

whether it is OK

N

Check whether

the earphone

connector ‘J9408’

is broken

N

After inserting the
earphone, Check

whether the voltage at

R3347 is 0V around

Y

Y

Y

Change the earphone

ok

Change J9408

N

Change R3347

Y

No sending voice of

the earphone MIC

No receiving voice of the

earphone receiver

Y

Change the broken one Change the broken one

Check whether there is any

part broken of C3348-C3349,

R3343-R3345

Check whether there is any

part broken of R3341,R3342,

C3340,C3341,B3340,B3341

Y

NN

Change the GSM

CPU U1100

OK

4.19 FM inefficacy

D/L the latest edition,

Check whether it is OK

FM NG

Y

ok

N

Enable FM function,

check whether the

voltage of B5312 =

2.8V

Y

Check whether the

output frequency of C331

s 32.768K

Y

N

Change B5312

N

Change C5314

Check whether

R5316 is broken

N

Check whether

C1401,B1401 is broken

Y

Check whether

U5313 is broken

N

Change the
CPU(U100)

Y

Change R5316

N

Change C1401,B1401

Y

Change U5313

OK

4.20 G-senser inefficacy

G-senser NG

D/Lthe latest edition,

Check whether it is OK

N

Check whether

U4401 is broken

N

Change the

CPU(U1100)

Y

ok

Y

Change U4401

OK

4.21 Wifi circuit(S200)

The module is targeted to mobile devices including smart phone, PDA, WiFi phone, DSC, DVC which need small WiFi module.
The highly integrated module allows the usage of web browsing, VoIP application.
The wireless SiP module support IEEE 802.11b/g standard and it can provide up to 54Mbps for IEEE 802.11g, 11Mbps for

802.11b to connect your wireless LAN.

Feature

Small footprint : 9.0 mm X 9.0 mm X 1.4 mm



Host interface : SDIO / eHPI16 / eHPI8



The S200 WiFi module supports SDIO, SPI and eHPI interfaces. For MTK feature phone platforms, only the HPI 8/16 bit (NFI) interface is supported.
For MTK smartphone platforms or other non-MTK platforms, only the SDIO/SPI interface is supported.



Support Orthogonal Frequency Division Multiplexing(OFDM), Complementary Code Keying(CCK), and Direct Sequence Spread Spectrum(DSSS) to provide a
variety of data rates



Support ad-hoc and infrastructure modes



IEEE 802.11g(OFDM 54Mbps) and IEEE 802.11b(DSSS 11Mbps)



Support Bluetooth co-existence



Support low power consumption sleep mode via 32 kHz clock



IEEE 802.11i(AES, TKIP, 802.1X) for advanced security



IEEE 802.11e QoS support for multimedia applications



Wakeup by specific packet(pattern search)



64/128-bit Wired Equivalent Privacy (WEP)



Shared clock, EEPROM, and full RF front ends integrated for WiFi



40MHz crystal embedded



RoHS compliant / Lead free



OS support WinCE/Win Mobile (V6.0/V6.1) and Linux

Wifi

Wifi NG

D/Lthe latest edition,

Check whether it is OK

N

Check whether

U6502,U6503 is broken

N

Check whether

U6500 is broken

Change the

CPU(U1100)

Y

ok

Change U6502,U6503

Y

Change U6500

Y

OK