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DG12BT(FLY DS400)_Maintenance Instruction
Prepared by : Tan, Hong Yun
Innovating Customer Value
TABLE OF CONTENTS
No power on
No power on (sub-module)
Shut off automatically
Death halt
No charge
Quantity of electricity faulty detection
No display
LED NG (on the LCD)
LED NG (on the keyboard)
Key NG
No ring
No receiving voice
No sending voice or the voice is small
No vibration
Card inefficacy ((Main module)
Card inefficacy ((Sub-module)
Camera inefficacy
Bluetooth inefficacy
TF card inefficacy
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Battery CONN
Socket of PIN card
(main module) BT area
CPU
FM area Earphone CONN
Adapter CONN (sub-module)
Antenna Camera CONN
( Main module)
Antenna
(sub-module)
Crystal
Socket of PIN card & FLASH (sub-module) Ring Chip RF PA (sub-module)
TF card (sub-module) (sub-module)
RF transceiver
(sub-module)
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CPU FLASH LCD
K/B CONN (main module) (main module)
Receiver
RF PA
(main module)
Transceiver Power supply chip
(main module)
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No power on
No power on
Check whether the
N
battery voltage is Charge the battery
higher than 3.5V
Y
Check whether the battery
and the key pad of J501 is Y Wipe off the thing
oxidized or there is or clean the key pad
anything else on it
N
Check whether the
Y Reassemble
connection of K/B &
M/B is OK the K/B
N
Take out the LCD and Cross-testing the
Y
SPK, Check whether it is LCD&SPK,
powered on Change the defective
N
A
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A
C509:1.8V, the capacitor: C509; Check whether
Y
D501,R548(10K) is Change D501,R548
C511:2.8V, the capacitor: C511: broken
C528:2.8V, the capacitor: C528;
C527:2.8V, the capacitor: C527; N
C530:2.8V, the capacitor: C530; Connect with the battery, Replace a earthed
C505:1.5V, the capacitor: C505. press "NO" key, check N capacitor corresponding to N
Change U501
whether the output voltage the defective pin, Check
of U501 is normal whether it is OK
Y
Check whether the
N Change X100,
output frequency of
X100 is 32.768K C100,C101
Y
Check whether the Check whether U5
N Y
output voltage of U5 pin4 has an voltage Change U5,C33,L8
pin3 is 0.58V around of 2.8V around
Y N
Change U501
Change the
FLASH(U903) of the
main module, check
whether it is OK
N
Change the OK
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R548
R502 R504
R505 R506
R507
R508
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No power on (sub-module)
No power on
(sub-module)
D/L the latest edition
Y
(both main &sub module), OK
Check whether it is OK
N
Check whether
Y Change RG106,
RG106,RG107(47K),
QG101 is broken RG107,QG101
N
Check whether there is
Y
anyone in CG120- Change the defective
CG127 broken
N
Check whether the
N Change XG100,
output frequency of
CG114,CG113
XG100 is 32.768K
Y
B
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B
Check whether the
N
output frequency of Change XG5
XG5 is 26M
Y
Replace with the
programming FLASH
(UG200) of sub-module,
check whether it is OK
N
Change the CPU
(UG100) of sub-module,
check whether it is OK
N
Change the CPU
(U100)
of main module
OK
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Shut off automatically
Shut off
automatically
D/L the latest edition, Y
Check whether it is OK OK
N
Replace with a
Y
good battery, Check
Change the battery
whether the
primary cell is broken.
N
Check whether the
rubber, used to fix the Y Reassemble the
battery, is lost or at the rubber
other location
N
Check whether the battery
and the key pad of J501 is Y Wipe off the thing
oxidized or there is or clean the key pad
anything else on them
N
C
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C
Check whether the
Y Re-weld or
battery connector `J501' is
change J501
void-welded or broken
N
Check whether the
connection of CN601 N Reassemble the K/B
&K/B FPC is OK,FPC is Or change the FPC
void-welded
Y
Check whether there
is any pin of the Y
Change CN601
connector `CN601'
( M/B &K/B) broken
N
Check whether X100
N ChangeX100,
output frequency is
C100,C101
32.768K exactly
Y
Refer to the maintenance OK
method of `No power on'
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Dead halt
Death halt
D/L the latest edition, Y
Check whether it is OK OK
N
Replace with a good
Y
battery, Check whether Change the battery
the primary cell is broken
N
Check whether the Clean the K/B,
Y
problem is resulted reassemble or change
from `KEY NG' the metal dome
N
Check whether the
Y
problem is resulted Change the LCD
from the LCD itself
N
D
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D
Check whether the
N Re-weld or change
output frequency of
X100 is 32.768 exactly X100,C100,C101
Y
Check whether the
connection of CN601 N Reassemble or
&K/B FPC is OK,FPC is change the FPC
void-welded
Y
Check whether there is
Y
any pin of the connector Change CN601
`CN601' ( M/B &K/B)
broken
N
Replacing with the
programming FLASH of
the main module, check
whether it is OK
N
Refer to the servicing
method of `No power on'
OK
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No charge
No charge
Replace with a
good battery, Check Y
Change the battery
whether the
primary cell is broken.
N
Replace with a good
adaptor, Check Y
Change the adaptor
whether the primary
adaptor is broken
N
Check whether the
Y Clean or
battery connector `J501'
change J501
is oxidized or is broken
N
Check whether the
Y Re-weld or
connector `CN602' is
change CN602
void-welded or
broken
N
E
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E
Plug in, Check whether
it has an voltage of 1V N Change R502(24K),
between R502 and R504(100K)
R504
Y
Check whether there
N
is anyone broken of Change the defective
R505~R508(100K)
Y
Check whether there
Y Change Q501,
is anyone broken of
R510(0ohm)
Q501,R510
N
Change U501, check
whether it is OK
N
Change the
CPU(U100) of
the main module
OK
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Quantity of electricity faulty detection
Quantity of electricity
faulty detection
Replace with a
good battery, Check Y
Change the battery
whether the
primary cell is broken.
N
Check whether there is
Y
anyone broken of R505- Change the battery
R508(100K)
N
Change U501, check
whether it is OK
N
Change the CPU
OK
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No display
No display
Check whether changing
Y Change and
the LCD driver can solve
the problem save the driver
N
D/L the latest edition, Y
Check whether it is OK
OK
N
Check whether the Y
Re-weld or
LCD is weakly
change the LCD
welded or broken
N
Check whether Y
R602(0ohm) is broken Change R602
N
Change the CPU OK
Of the main module
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LED NG (on the LCD)
LED NG (LCD)
Check whether the Y
LCD is broken Change the LCD
N
Check whether Y
L501,L502 are broken Change L501,L502
N
When normally
backlighting, check Y
whether the voltage of Change Q502,D502
Q502 pin3 is at the
high level
N
Check whether there is
Y
anyone broken of Change the defective
R539,R537,R540,
R541
N
Change U501, N Change the CPU OK
check whether it is of the main module
OK
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LED NG (on the key board)
LED NG (key)
Check whether there
Y Clean or wipe off
is anything (or Mylar)
on the key the thing
Checking methodCross- N
testing the two sides of
LED by Multimeter ,
gearing to the short circuit, Check whether the Y Re-weld or
if the LED is on at one LED of the K/B is change the LED
direction, it shows good. weakly welded or
broken
N
Check whether the
connection of CN601 N Reassemble the K/B
&K/B FPC is OK,FPC is Or change the FPC
void-welded
Y
Check whether there is
any pin of the connector Y
Change CN601
`CN601' ( M/B &K/B)
broken
N
F
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F
Check whether the
Y
resistor beside the Change the resistor
LED is broken
N
Check whether the
Y Check R620,
voltage at R620 is at
the high level(1V)) R619,Q602
N
Change the CPU
Of the main module
OK
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Key NG
KEY NG
Check whether there is
Y cleaning the key pad
anything oxidized or
smudge on the key pad With YC336
N
Check whether the
Y Change the
metal dome is oxidized
metal dome
or broken
N
Check whether the
N Reassemble the K/B
connection of CN601
Or change the FPC
&K/B FPC is OK,FPC
is void-welded
Y
Check whether there is
Y
any pin of the connector Change CN601
`CN601' ( M/B &K/B)
broken
N
G
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G
Check whether the Y Chang the side-key FPC
side-key is NG Or the side-key metal dome
N
Check whether there
Y
is anyone broken of Change the defective
D605-D618
N
Change the CPU
Of the main module
OK
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No ring
No ring
D/L the latest edition, Y
Check whether it is OK OK
N
Checking methodtesting
Check whether the
the resistance of the SPK Y Re-weld or
SPK is void-welded
by Multimeter, gearing to change the SPK
or broken
the resistance, the
resistance of it is 8ohm
normally N
Check whether it
Y
has an output Check L405,L406
voltage of 1.8V at
U404 pin5,8
N
Check whether is has
N Check R422,R421,
an output voltage of
R431,C421,C431
1.8V at U404 pin3,4
Y
H
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H
Check whether the
Y
voltage at U404 pin1 is Change U404
at the high level
N
Check whether Y
R423(20K) is broken Change R423
N
Change the CPU
Of the main module
OK
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No receiving voice
No receiving voice
D/L the latest edition, Y
Check whether it is OK OK
N
Checking methodtesting
the resistance of the REC
by multimeter, gearing to Check whether the
Y Re-weld or
the resistance, the REC is void- welded
or broken Change the REC
resistance of it is 30ohm
around
N
Check whether Y
L412,L413 are broken Check L412,L413
N
Change U407,U406,
U408,check whether
it is OK
N
Change the CPU OK
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No sending voice or the voice is small
No sending voice
or a small voice
D/L the latest edition,
Y
Check whether it is OK
OK
N
Check whether the MIC
Y Reassemble or change
rubber is broken or
displacement the MIC rubber
N
Checking method
testing the resistance of
the MIC by multimeter, Check whether the
Y Re-weld or
gearing to the resistance, MIC is weakly welded
change the MIC
the positive resistance of or broken
it is 1K, the opposite is
0.8K around in general.
N
Check whether there is
anyone broken of Y
Change the defective
R400,R432(1K),
R405,R406(1.5K)
N
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I
Check whether there is
Y
anyone broken of Change the defective
C402,C403,L401,L402
N
Change U400,U401,
check whether it is OK
N
Change the CPU
of the main module
OK
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No vibration
No vibration
D/L the latest edition, Y
Check whether it is OK OK
N
Check whether the
Y Reassemble
motor is locked by
the motor
displacement
N
Checking methodtesting
the resistance of the motor
by multimeter, gearing to Check whether the Y
the resistance, the motor is broken Change the motor
resistance of it is 22ohm in
general
N
Entering test mode,
Y Check R533(1K),
Check whether it has an
Q503,D500
voltage of 1V at R526
N
Change the CPU OK
Of the main module
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Card inefficacy (Main module)
Card inefficacy
D/L the latest edition, Y
check whether it is OK OK
N
Check whether the Y
SIM card is broken Change the SIM card
N
Check whether the Y Re-weld or
socket `J602' is void- change J602
welded or broken
N
Change U501,
Check whether it is OK
N
Change the CPU OK
Of the main module
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Card inefficacy (Sub-module)
Card inefficacy
D/L the latest edition, Y
check whether it is OK OK
N
Check whether the Y Change the
SIM card is broken SIM card
N
Check whether the
Y Re-weld or
socket `J601' is void-
change J601
welded or broken
N
Check whether there
Y
is anyone broken of Change the defective
D619-D622
N
Change the CPU OK
Of the sub-module
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Camera inefficacy
Camera NG
Check whether the Y
camera is broken Change the Camera
N
Check whether the Y
connector `CN701' is Change CN701
broken
N
Check whether U702 Check whether the
N Y
pin1 has an voltage of voltage at U702 pin4,6 is Change U702
2.8V,pin3 has 1.5V the high level
Y CPU
Check whether Y
R701,R703 are Change R701,R703
broken
N
Change the CPU OK
Of the main module
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Bluetooth inefficacy
BT NG
D/L the latest edition,
Y
check whether it is OK OK
N
Check whether the N Reassemble the
BT antenna is antenna
touched well
Y
Check whether
Y
J301 is void- Change J301
welded or broken
N
Check whether
Y Change
BPF301,L302 are void-
welded or broken BPF301,L302
N
J 45
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J
Change U501
N
Enable the BT function,
N Check whether Y
check whether is has an Change R525
R525(0ohm) is
voltage of 2.8V at R525
broken
Y
Check whether
N Change
X301 has an output
X301C309C310
frequency of 26M
Y
Change U301, check
whether it is OK
Change the CPU
Of the main module
OK
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TF card inefficacy
TF NG
D/L the latest edition, Y
check whether it is OK OK
N
Check whether the Y
socket `J601' is void- Change J601
welded or broken
N
Check whether it
N
has an voltage of Change R530
2.8V at R530
N
Change U501,
check whether it is
OK
N
Change the CPU OK
Of the main module
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