FLY FS501 Service Manual Download Page 26

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FLY SERVICE SUPPORT

4) SIM card holder exist Weld

5) card exceeds the itinerary or inserted upside

SIM

card circuit

3.2.7 Gravity Sensor

FS501 G-Sensor circuit is very simple, Power offer power to the Sensor IC power, I2C bus

transfer command and data. G-Sensor faults and the reasons:

1, Sensor without functions: whether the paster is OK

Summary of Contents for FS501

Page 1: ...FLY SERVICE SUPPORT FS501 Service Manual V1 0...

Page 2: ...trouble 9 2 3 WCDMA RX trouble 11 2 4 GSM RX trouble 12 2 5 WiFi BT BT Part 14 3 Baseband section 7 3 1 Outline 16 3 2 Common Failure Analysis and Maintenance 17 3 2 1 Power failure Check 17 3 2 2 Aud...

Page 3: ...is one of the important links among mobile products rear end producing The speed and quality of maintenance relate to the rate of good products production efficiency and cost control throughout the pr...

Page 4: ...FLY SERVICE SUPPORT 1 3 Mainboard component distribution diagram Mainboard TOP...

Page 5: ...FLY SERVICE SUPPORT Mainboard BOTTOM...

Page 6: ...5PPM 1 8V 2 5x2x0 8mm NT2520SB ENG3216E Y801 10 Multilayer Chip Band Pass Filters 2 4GHz BF2012 L2R4 NBA T LF U808 11 SR3131 50 QFN 5 5x7 040 RF 3G transceiver SR3131 U901 12 SAW FILTER FOR GSM900 Rx...

Page 7: ...FLY SERVICE SUPPORT 2 1 WCDMA RF power trouble Check points PA connector soldering Duplexer connector soldering Other Tx RF Component soldering Wcdma Band I Wcdma Band VIII...

Page 8: ...onnector soldering is ok Yes Check Dupolexer connector is ok No Resoldering No Resoldering Yes Check Other Tx RF components soldering is ok No Resoldering 2 2 GSM RF power trouble Check points Trancei...

Page 9: ...FLY SERVICE SUPPORT...

Page 10: ...FLY SERVICE SUPPORT 2 3 WCDMA RX trouble Check points Tranceiver connector soldering Duplexer connector soldering ASM switch connector soldering Other Rx RF Component L C soldering...

Page 11: ...PPORT Start Check Traceiver connector soldering is ok Yes Check Duplexer connector is ok No Resoldering No Resoldering Yes Check Other ASM Switch soldering is ok No Resoldering Check Other components...

Page 12: ...FLY SERVICE SUPPORT 2 4 GSM RX trouble Check points Tranceiver connector soldering ASM switch connector soldering Rx SAW filter connector soldering Other Rx RF Component L C soldering...

Page 13: ...ICE SUPPORT Start Check Traceiver connector soldering is ok Yes Check ASM Switch is ok No Resoldering No Resoldering Yes Check Rx SAW filter soldering is ok No Resoldering Check Other components L C s...

Page 14: ...FLY SERVICE SUPPORT 2 5 WiFi BT GPS Part 2 5 1 WIFI BT GPS Part...

Page 15: ...e freq error if the power is too high or the freq too big EVM may also lead to excessive please re test 4 WIFI RX fail main receiving sensitivity fails to pass check whether U803 has solder skips Gene...

Page 16: ...calibration parameters such as RF control correction value of an audio signal the IMEI number and other important information and store user settings data such as phone number CALL volume and tone LP...

Page 17: ...down leakage current boot large current The main reason for the problem Weld electrical the original filtering or ESD device to short circuit burning with the device is connected to a power source Pos...

Page 18: ...ne s speaker circuit is as follow Speaker Loop Speaker Common faults and reasons 1 SPK Ringtones reasons 1 light board SPK itself is bad or the connection FPC problem the whole observation board board...

Page 19: ...thout sound 1 Receiver assembly adverse the shrapnel and board poor contact 2 Receive ontology bad 3 the volume settings or software problems 2 Receiver noise or volume 1 Receiver incoming material wh...

Page 20: ...rd 3 5mm headphone Its circuit diagram is as follows Headphones common faults and reasons 1 headphones only one channel sound 1 the headset is not inserted in place 2 Relevant component Weld 3 Relevan...

Page 21: ...ot recognize 1 Relevant component Weld 2 whether headphones Block shrapnel and motherboard good contact 3 software reasons 4 headset MIC no transmitter 1 the headset is not inserted in place 2 Relevan...

Page 22: ...atic as shown below Common problems and causes of the LCD module 1 LCD screen is blank 1 LCD is not installed or and fixture poor contact 2 LCD backlight circuit is bad check backlight so that the foo...

Page 23: ...Weld or even tin short circuit 3 software problems 3 LCD black spots bright spots black lines stripes Failure LCD ontology bad 3 2 4 FM The CPU controls FM IC working condition through the I2C signal...

Page 24: ...t shrapnel contacts with the mainboard well 6 whether headphone socket welding is OK 3 FM module operation failed 1 Check whether the I2C and CLK signal are normal or not 2 Software fault 3 2 5 Camera...

Page 25: ...Camera body has problems Back camera Front camera 3 2 6 SIM card failure FS501 SIM card module circuit is connected directly with PMIC through eight path signal from SUIM slot The major failure of th...

Page 26: ...e itinerary or inserted upside SIM card circuit 3 2 7 Gravity Sensor FS501 G Sensor circuit is very simple Power offer power to the Sensor IC power I2C bus transfer command and data G Sensor faults an...

Page 27: ...ding phenomenon Capacitance may on short circuit using a multimeter to test whether T card signal and ground and VMCH short circuit can eliminate 3 software reason 2 T card not to know card T holder P...

Page 28: ...ss can cooperate with LCD and startup current as well as the keyboard and so on to orientate approximately 1 Power off leak current is large The main failure reason is VBAT connected components had gn...

Page 29: ...boot LCD displays normally even can enter the IDIE interface single board is very hot 1 The individual power circuit short circuit to ground phenomenon exists in the phone which is usually the proble...