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4.18 Earphone inefficacy

Earphone inefficacy

Check whether

the IO

connector ‘J9431’

is broken

Change J9431

Check whether the

earphone is broken

Change the earphone

After inserting the

earphone, Check

whether the voltage at

R3300 is 0V around

Change R3300(1K),

C3319, B3305

D/L the latest edition,

check whether it is OK

ok

N

N

N

N

Y

Y

Y

Y

Summary of Contents for E146

Page 1: ...E146_Maintenance Instruction Prepared by xiaoyu wan Approved by Date 2010 9 28...

Page 2: ...rence 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 keyboar...

Page 3: ...ne E146 mainboard is based on the MTK platform designed to support 2 band which supporting the FM and Bluetooth calls and transmission the mainboard system consists of the base band CPU MT6253 PF38F40...

Page 4: ...Flash CPU RF PA FM LCD CON MT6253 TY6701111184KC RF7161 RDA5802ES MT6253 1 2 Distribution of the mainboard components Camera FPC...

Page 5: ...Antenna Socket of SIM card Battery CONN Adapter CONN BT area MT6612 Socket of T card K B FPC G senser MXC62025MP...

Page 6: ...y need for external connections of VBAT AVDD RF7161 it supports EGSM DCS and integrated automatic power control and transceiver switch Transceiver MT6253 with the RF modulation and demodulation functi...

Page 7: ...ltage 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...

Page 8: ...2 4 Common RF Malfunction Detection and Maintenance Flow Chart of MS Transmit malfunctio...

Page 9: ......

Page 10: ...ce Deinterleave Encryption Decryption and Control Processor subsystems including ARM7EJ S and its peripheral circuits There are 25 address lines 16 data lines 8 chip select lines provided 7 external i...

Page 11: ...h CPU MT6253 Nor Flash PF38F4050M0Y3DEA PMU MT6253 3 3 Power management Power management consists of the charging circuit integrated in MT6253 and the external charging circuit It provides 11 road LDO...

Page 12: ...oot 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 UMT6253 starts to run and roll pollin...

Page 13: ...d 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...

Page 14: ...3 4 2 Detection and Maintenance Flow Chart of No download malfunction...

Page 15: ...idized or there is anything else on it Charge the battery Wipe off the thing or clean the key pad Check whether the connection of KEY PCB MB is OK Reassemble or Charge the KEYPAD FPC Take out the LCD...

Page 16: ...the defective pin Check whether it is OK ChangeU1100 C1119 1 8V C1119 2 8V C1120 2 8V C1121 2 8V C1122 2 8V C1123 2 8V Y N N N Connect with the battery press ON key check whether the output voltage of...

Page 17: ...Change the Flash U1101 check whether it is OK ChangeU1100 OK Y Check whether the output voltage of U2602 pin 3 is 0 5V around Change U2602 Change U2605 N Y N Change U1101 N...

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Page 20: ...Check whether the primary cell is broken ok Change the battery Check whether the rubber used to fix the battery is lost or at the other location Reassemble the rubber Check whether the battery and th...

Page 21: ...ether the contact of the key PAD the dome is OK Reassemble the dome Check whether X1100 output frequency is 32 768K exactly ChangeX1100 C1113 C1114 Refer to the maintenance method of No power on OK N...

Page 22: ......

Page 23: ...ace with a good battery Check whether the primary cell is broken ok Change the battery Check whether the problem is resulted from KEY NG Clean the K B reassemble or change the metal dome Check whether...

Page 24: ...the dome is OK Reassemble the dome Check whether the output frequency of X1100 is 32 768 exactly ChangeX1100 C1113 C1114 Replacing with the programming FLASH check whether it is OK OK Refer to the se...

Page 25: ...hange the battery Replace with a good adaptor Check whether the primary adaptor is broken Clean or change J9410 Check whether the Micro USB J9431 is oxidized or is broken Clean or change J9431 Change...

Page 26: ...Check whether there is broken of U1102 R1105 C1131 Z1340 Change the defective Plug in Check whether it has an voltage of 5V on B1103 Change B1103 BLM18EG221TN1 OK N N Y Y ChangeU1100...

Page 27: ...tricity faulty detection Replace with a good battery Check whether the primary cell is broken Change the battery Format and Download the latest Software then calibrate the ADC Check whether there is b...

Page 28: ...4 6 No display No display Download the latest Software Check whether it is OK ok N Y Check whether the LCD is weakly welded or broken Re weld or change the LCD OK N Y ChangeU1100...

Page 29: ......

Page 30: ...the LCD LED NG LCD Change U4400 Check whether the LCD is broken Check whether C4400 C4402 C4441 C4444 is broken Change the LCD OK N N Y Y ChangeU1100 Change U4400 Check whether L1106 L1102 C1132 C1133...

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Page 32: ...ge the LED Check whether there is anything or Mylar on the key Check whether the resistor beside the LED is broken Clean or wipe off the thing Change the resistor Checking method Crosstesting the two...

Page 33: ...Check U1100 Check whether R4409 C4490 C4491 is broken Change R4409 C4490 C4491 OK N Y Check whether the connection of sliding PCB MB is OK Reassemble or Charge the sliding FPC N Y...

Page 34: ......

Page 35: ...metal dome is oxidized or broken Change the metal dome Check whether there is anything oxidized or smudge on the key pad cleaning the key pad N N N Y Y Y Check whether the connection of KEY PCB MB is...

Page 36: ...Check whether the D4417 D4420 D4429 D4434 is broken Change the defective OK Change CPU U1100 N Y...

Page 37: ...is OK Check whether L3300 L3301 B3307 B3308 C3306 C3307 C3322 C3323 D3304 D3305 ok Change the defective Checking method testing the resistance of the SPK by Multimeter gearing to the resistance the re...

Page 38: ......

Page 39: ...3315 B3320 B3321 D3320 D3321 is broken OK Change the defective Change the CPU D L the latest edition Check whether it is OK Ok Checking method testing the resistance of the REC by multimeter gearing t...

Page 40: ......

Page 41: ...k whether the MIC is weakly welded or broken Re weld or change the MIC Check whether there is anyone broken of R3305 3308 D L the latest edition Check whether it is OK ok Checking method testing the r...

Page 42: ...check whether there is anyone broken of C3308 3312 B3300 B3301 D3301 D3302 Change the defective OK Change the CPU N Y...

Page 43: ......

Page 44: ...st edition Check whether it is OK ok Checking method testing the resistance of the motor by multimeter gearing to the resistance the resistance of it is 22ohm in general Check whether there is anyone...

Page 45: ......

Page 46: ...is broken Change the SIM card Check whether the SIM Card Connector J9420 is broken OK Change the defective D L the latest edition check whether it is OK ok Check whether there is anyone broken of C442...

Page 47: ......

Page 48: ...heck whether the socket J9406 is void welded or broken Re weld or Change J9406 Check whether there is anyone broken of C4433 C4434 OK Change the defective D L the latest edition check whether it is OK...

Page 49: ......

Page 50: ...whether J9401 pin6 has an voltage of 2 8V pin4 has 1 8V Change the defective Check whether the connection of J9401 Camera is OK Reassemble the Connector Check whether B4410 is broken Change B4410 Che...

Page 51: ......

Page 52: ...hone 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 P...

Page 53: ...he BT antenna is touched well Reassemble the antenna Check whether C5307 is void welded or broken Change C5307 D L the latest edition check whether it is OK ok Check whether U5301 C5300 are voidwelded...

Page 54: ...a voltage of 2 8V C5305 has 1 2V Change C5301 C2637 OK Change the CPU Check whether the voltage at R5301 is the high level Change U5300 Change CPU Check whether C5301 has an output frequency of 26M Ch...

Page 55: ......

Page 56: ...connector J9431 is broken Change J9431 Check whether the earphone is broken Change the earphone After inserting the earphone Check whether the voltage at R3300 is 0V around Change R3300 1K C3319 B3305...

Page 57: ...3303 B3306 C3351 C3320 OK Change the CPU U1100 Check whether there is anyone broken of R3300 R3309 R3310 C3316 3319 B3304 B3305 No sending voice of the earphone MIC No receiving voice of the earphone...

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Page 59: ...tion check whether C5311 has a voltage of VBAT C5312 has a voltage of 2 8V check whether there is anyone broken of C5309 C5401 B5401 Change the defective D L the latest edition Check whether it is OK...

Page 60: ...Check whether the output frequency of C5310 is 32 768K Change C5310 OK Change the CPU Change U5303 Change the defective check whether there is anyone broken of C5313 C5314 N Y N Y N...

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Page 62: ...4 20 G sensor inefficacy G sensor inefficacy Change U4302 Check whether U4302 is broken OK Change the CPU D L the latest edition Check whether it is OK ok N N Y Y...

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