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4. Vibrator not in operation
1. Check to see if Gate pin voltage at Q540pin is 2.8V.
2. Check to see if Board to Board connector is correct.
3. Check the path from Q540 to vibrator
4. Check to see if there is no short between vibrator wire and mechanical parts.
5 MP3 Play not in operation
1. Check to see if NO.1 pin signal at U990 is high
2. Check to see if U990 peripheral circuit at the LCD module is correct
3. Check to see if audio path between speaker and U990 is correct.
6. Camera Play not in operation.
1. Check to see if C882 voltage is 3.3V.
2. Check to see if C651 voltage in the LCD Module is 2.8V.
3. Check to see if NO.9 pin voltage at J650 in the LCD Module is 1.8V.
4. Check to see if Camera control signal and data signal are correct
at the B to B connector (J631)
5. Check to see if the 24pin connector contact in the camera module is correct
6. Replace Camera Module
7. FM Radio Play Error
1. Check to see if the I2c_CLK/DATA signal of FM Radio is correct
2. Check to see if the C712 clock is 32.768khz
3. Check the value of L712/C718/C717 is same with FM Radio matching value at
schematic
8 Charging error
1. Check to see if the battery voltage is under 2.4 voltage
2. Check to see if the charger out voltage is 5-5.3v
9. Bluetooth error
1. Check to see if Drain pin at Q870 voltage is 2.8
2. Check to see if U700 peripheral circuit is correct
3. Check the matching value of C701/L700/L701 is same with the value at schematic
10. GSM RX/TX Power
* Check to see if Battery power is 3.8V.
Summary of Contents for SP-770
Page 1: ...SP 770 AS Manual GSM GPRS Cellular Phone SKYSPRING VITELCOM...
Page 6: ...SECTION1 SP 770 PRODUCT OVERVIEW...
Page 27: ...Figure4 Battery Charger Flow chart...
Page 36: ...SECTION2 SCHEMATIC LAYOUT 1 MAIN PART SCHEMATIC LAYOUT 1 1 BASEBAND PART...
Page 37: ...1 2 MMI PART...
Page 38: ...1 3 RF PART...
Page 39: ...2 MAIN KEY PART SCHEMATIC LAYOUT...
Page 40: ...3 LCD...
Page 41: ...SECTION3 PCB LAYOUT 1 MAIN PCB 1 1 Location Map of Main PCB Top...
Page 42: ...1 2 Location Map of Main PCB Bottom...
Page 43: ...2 MAIN KEY PCB 2 1 Location Map of Main KEY PCB Top...
Page 44: ...2 2 Location Map of Main KEY PCB Bottom...
Page 45: ...3 LCD PCB...
Page 46: ...SECTION4 MECHANICAL ASSEMBLY...
Page 48: ...3 LOGIC PART TROUBLESHOOTING...
Page 50: ...3 2 Troubleshooting 2 LCD Display Backlight error...
Page 51: ...3 3 Troubleshooting 3 Key push error...
Page 52: ...3 4 Troubleshooting 4 Vibrator error...
Page 53: ...3 5 Troubleshooting 5 MP3 Play error...
Page 54: ...3 6 Troubleshooting 6 Camera Preview error...
Page 55: ...3 7 Troubleshooting 7 FM Radio Play error...
Page 57: ...3 9 Troubleshooting 9 Bluetooth error...
Page 58: ...4 RF PART TROUBLESHOOTING...
Page 59: ...4 1 Troubleshooting 10 RX path check...
Page 60: ...4 2 Troubleshooting 11 TX path check...
Page 64: ...4 Settings 4 1 Flash Tool setting 1 Firstly Check values of the setting in an Options menu...
Page 66: ...5 SW Downloading 1 Connect LT cable to the PC 2 Press the Download button...
Page 67: ...3 Connect LT cable to the target mobile phone with power off 4 Completion of downloading...
Page 74: ...5 4 Save back up NVRAM data as a file Save back up NVRAM data from target as a file...
Page 77: ...6 4 Download to flash Click download to flash button and then updating parameters is complete...