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C2A
A) Technical Specifications:
Particular
Key Matrix For Flashing
Chipset
Android Version
Frequency
Network Mode
Rom
RAM
Internal SD Card memory
Expandable Memory
Remarks
NO
MT6737V/WHA
7.0
GSM 2/3/5/8, WCDMA 1/8, FDD1/ 3/ 5, TDD 40/41
SIM1: GSM+WCDMA+LTE
SIM2: GSM
32GB
24Gb
YES
NO
L3 Service Manual
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Table of Contents
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Summary of Contents for cromax C2A
- Page 1 L3 Service Manual A) Technical Specifications: Particular Remarks Key Matrix For Flashing Chipset MT6737V/WHA Android Version Frequency GSM 2/3/5/8, WCDMA 1/8, FDD1/ 3/ 5, TDD 40/41 SIM1: GSM+WCDMA+LTE Network Mode SIM2: GSM 32GB 24Gb Internal SD Card memory Expandable Memory...
- Page 2 L3 Service Manual Factory mode code *#*#21719*#*# Good Earpiece volume Good Loudspeaker volume Good MIC volume Good Vibrator volume Engineering Code B) CAUTIONS I. Flashing & Servicing must be undertaken by qualified personnel only. II. Ensure all work is carried out at an anti-static workstation and that an anti-static wrist strap is worn.
- Page 3 L3 Service Manual C) L3 Service Manual J901 earphone Q1001 Front J1002 Front cam connect Flash IC connect U101 CPU U2001 PMU IC J1801 T-card&SIM connect U4102 Memory U706 charge IC J1101 LCD connect...
- Page 4 L3 Service Manual J1001 Rear cam J501 Finger D805 Rear connect connect Flash LED U1700 WCN IC J1202 sidekey connect U1300 RF Transceiver U1507 2G PA U801 backlight J502 SUB J702 Battery U1403 4G PA Board connect connect U802 Rear Flash IC...
- Page 5 L3 Service Manual D) Symptoms 1. Unable to load Software: 2. RF ISSSUE: 2.1 LTE part...
- Page 6 L3 Service Manual LTE/WCDMA Multi-mode PA : Primary Antenna port: Diversity Antenna port:...
- Page 7 L3 Service Manual Antenna switch receiving ports: For FDD-LTE(primary) band1 signal comes from primary antenna switch through duplexer U1506 and matching circuit to transceiver RX ports. For FDD-LTE(primary) band3 signal comes from primary antenna switch through duplexer U1509 and matching circuit to transceiver RX ports.
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Page 8: Wcdma Rf Power Trouble
L3 Service Manual and matching circuit to transceiver RX ports WCDMA RF power trouble Check points -PA connector soldering -Duplexer connector soldering -Other Tx RF Component soldering Wcdma Band I&VIII... -
Page 9: Gsm Rf Power Trouble
L3 Service Manual For WCDMA RF power: Step1:check PA connector soldering is ok, if no,,reslodering or repalace Step2:check duplexer connector is ok, if no,,reslodering or repalace Step3:check other Tx RF component soldering if no is ok ,reslodering or repalace GSM RF power trouble Check points -Tranceiver connector soldering -PA connector solderin... -
Page 10: Wcdma Rx Trouble
L3 Service Manual 2.4 WCDMA RX trouble Check points -Tranceiver connector soldering -Duplexer connector soldering -ASM switch connector soldering -Other Rx RF Component (L/C) soldering... - Page 11 L3 Service Manual Wcdma Band VIII -RX Wcdma Band I - RX For WCDMA Rx issue: Step1:check Tranceiver connector soldering is ok, if no,,reslodering or repalace Step2:check duplexer connector is ok, if no,reslodering or repalace Step3:check ASM Switch soldering is ok, if no,reslodering or repalace Step4:check other Rx RF component soldering if no is ok ,reslodering or repalace...
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Page 12: Gsm Rx Trouble
L3 Service Manual 2.5 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 L3 Service Manual For GSM Rx issue: Step1:check Tranceiver connector soldering is ok, if no,,reslodering or repalace Step2:check duplexer or rx SAW soldering is ok, if no,reslodering or repalace Step3:check ASM Switch soldering is ok, if no,reslodering or repalace Step4:check other Rx RF component soldering if no is ok ,reslodering or repalace...
- Page 14 L3 Service Manual 2.6 WiFi/BT/GPS Part 2.6.1 WIFI/BT/GPS Part GPS LNA part...
- Page 15 L3 Service Manual WIFI BT share RF access, signal is entered by antenna, through U1702 2.4GHZ filter, filter sideband unwanted signal. The clock uses 26M clock provided separately. Data transfer interface and audio interface are directly connected to the CPU. Interface has SDIO is used for the WIFI signal transmission;...
- Page 16 L3 Service Manual GPS main problem： GPS signal first enters the GPS saw U1703 and U1704, after saw, input to MT6625L chip within, demodulate signal . The GPS fails to search satellite or the search- satellite GPS_REG_ON value is high, focus on checking the U1703 and U1704 filters paste partial or Weld, then check the tcxo power supply of VDDRF0, four voltage normal check whether the UART single working.
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