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2.5.8 LCD

LCD module communicates with cpu through the MIPI_DSI interface circuit. The device

U1701 is the common filter for data and clock signal of MIPI_DSI interface.

Figure 31 LCD’s interface circuit

The following figure 31 is the back light driver circuit. If the back light led has some

problems, please check the voltage on R1326, or check the D1320 and L1320 whether or

not is burn out.

Figure 32 LCD’s back light driver circuit

Содержание STUDIO 5.0 S

Страница 1: ...1 BLU Studio 5 0S Service Manual...

Страница 2: ...2 The voltages put out from PMU 14 2 3 Memory 15 2 4 Audio module 16 2 4 1 Microphone circuit 16 2 4 2 Earpiece circuit 17 2 4 3 Speaker circuit 17 2 4 4 Audio Jack circuit 18 2 5 Other peripherals 1...

Страница 3: ...a wrist strap when exchange system boards When repairs are made to a system board they should spread the floor with anti static mat which is also grounded Use a suitable grounded soldering iron Keep...

Страница 4: ...tail theory of the Studio 5 0S and to offer a maintenance guide for the later mass production and after service The readers of the document should be the debug worker of SMT and after service It will...

Страница 5: ...Studio 5 0S has several main modules as below 1 Baseband module This module include the mobile phone s core of BB and AP Such as system s processor memory power manager unit and so on 2 Radio Frequen...

Страница 6: ...n camera FPCA the reset button s FPC and ANT s sub board 1 Components of main board U101 it s complex processor which includes AP and BP It mainly was used to control the BB s RF module audio and othe...

Страница 7: ...cies And on the time it can amplify the qual band GSM radio signal U1206 The saw filter on the rx path of GSM1800 and GSM1900 U5605 The saw filter on the rx path of GSM850 and EGSM900 U1205 The saw fi...

Страница 8: ...board and main camera FPC J5732 The connector between mainboard and front camera FPC J1401 JTAG s connector U1403 U1404 The common mode filter of front camera s MIPI_CSI interface U1405 U1406 U1407 Th...

Страница 9: ...nly they all work normally the system can boot normally 2 1 RF module 2 1 1 Transceiver U1101 is the transceiver which supports GSM and WCDMA mode Figure 2 RF transceiver 2 1 2 GSM signal s path 1 Tx...

Страница 10: ...igure 5 GSM high and low bands signals arrive antenna subboard through the RF cable 2 Rx path GSM s signal was received by antenna and reach the J1203 on main board after through the path on Figure 5...

Страница 11: ...r U5605 and U1206 Figure 7 GSM s rx signal s path from he saw filter U5605 and U1206 to U1101 2 1 3 WCDMA signal s path STBW5933 supports the wcdma mode on band1 and band 8 They will be described as b...

Страница 12: ...r circuit shared by wcdma s band1 and band8 which is used to detect the tx power by U1101 2 wcdma band 8 tx signal s path Band 8 s tx path is same as band 1 The tx signal comes from U1101 and then thr...

Страница 13: ...through a match network and C1201 and C1209 The path was described in figure 10 as below Figure 10 WCDMA s rx signal path from diplexer to U1101 After BC1 s signal entered in U1101 in order to improve...

Страница 14: ...the pinN11 to low and turn on the switch of system s power MOSFET U803 3 PMU puts out all the voltage according to the boot timing 4 PMU pulls the pin PON_RESET_N to high level and reset the U101 5 Af...

Страница 15: ...he core voltage of cpu After the boot end all the voltage from PMU and the clock signal should keep stable 2 3 Memory SDRAM NAND Flash Memory save the program code and run the program If they have som...

Страница 16: ...should be a clock signal through the resistor R212 Memory module s supply voltage as below figure 14 Figure 13 memory s supply voltage 2 4 Audio module 2 4 1 Microphone circuit U101 can provide the a...

Страница 17: ...Earpiece circuit Earpiece s P M signal arrival the pads through the filter network as below after they come out from U101 Figure 16 Earpiece s circuit 2 4 3 Speaker circuit Speaker s signal come out...

Страница 18: ...T_N is high level when the earpiece inserted PMIC_HPH_LS will be low level then the CPU detects the event that having a earpiece be inserted 2 Headphone s microphone circuit MB_IN signal is used to de...

Страница 19: ...Other peripherals 2 5 1 Vibrator VBAT is the anode VIB_DRV_N puts out the low level to drive the vibrator to shock Figure 19 vibrator s driver circuit 2 5 2 Touch panel circuit The TP communicates wi...

Страница 20: ...era 0 3m and a main camera 5M 1 Main camera circuit Main Camera is welded on camera FPC and the peripherals are welded on main board The camera and main board connect together through the connector J6...

Страница 21: ...23 Light sensor circuit Light sensor s failure often was caused by sealed not well or other devices shared IIC have something wrong 2 5 5 G sensor circuit Figure 24 g sensor circuit 2 5 6 BT WIFI modu...

Страница 22: ...1 Figure 25 BT module interface circuit Figure 26 Supply power voltage of BT Figure 27 the switch module of WIFI and BT module...

Страница 23: ...8 WIFI module circuit 2 5 7 GPS The GPS signal through the saw filter U1801 low noise amplifier U1802 saw filter U1803 then arrivals U1101 Figure 29 GPS front end circuit Figure 30 GPS s signal enters...

Страница 24: ...ilter for data and clock signal of MIPI_DSI interface Figure 31 LCD s interface circuit The following figure 31 is the back light driver circuit If the back light led has some problems please check th...

Страница 25: ...antenna sub board the U1115 is the OVP ic for USB s Ubus voltage Figure 33 USB s OVP circuit 2 6 2 Volume key Figure 34 volume key and key circuit 2 6 3 T flash card and USIM card interface This part...

Страница 26: ...1 Figure 35 Dual SIM card interface circuit Figure 36 T flash card interface circuit...

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