This is a simple guide about the China phone software repair for technicians, both new and old. Various terminologies are explained below.
What need to know about a Chinese phone when we repair?
1. CPU Type
2. Flash Chip model
3. Original software/flash file version.
4. Phone TX RX.
What is TX RX?
TX = Transmit, RX = Receive.
A type of connection that will help you connect your phone with pc for software operation. It’s just a type of connection name.
what is cpu?
Central processing unit. A part of the phone. its type a type-ahead on a phone. all phone have cpu but for china phone cpu is important for repair this phone. Chinese phones have various types of CPU.
Why is it important for a Chinese phone?
All other phones have CPU, UEM, and UPP, but for china phone cpu is important for repairing because various Chinese phone CPUs support various tools/devices when you do software operations in the phone.
How to know CPU type/model?
Now many of device auto detect cpu type, so no problem to know which cpu use in this phone that you want to repair. Also, you can open the phone and see what cpu use in the phone/what name is written on the CPU.
MTK
Spreadtrum
Infineon
Sky/Skyworks
ADI/AD
Philips
Agree
TI / Power Management
Mstar
Coolsend
VIA
SAMSUNG
SI4904
ANYKA
etc
What is a flash chip and RAM?
flash chip store phone software in it. RAM is extra built-in memory that gives space to the phone and flash chip to store phone software and the operating system in its memory when the phone is open/running. Some Chinese phone flash chip and RAM included in one chip, and some in the CPU. So if your flash area or ram area is damaged in the flash chip, you need to change the total chip (CPU, Flash IC) using many types of companies’ chips under various model names, such as Samsung, Toshiba, Intel, ST, etc
Flash chip name/model is important for a Chinese phone, like the CPU?
Not like CPU, but it’s important because when we flash a Chinese phone, if we know which flash chip is used in it, then we can find the perfect flash file.
What problem with the China phone model name?The
model name is not a big matter for a Chinese phone. because with the same name have many, many phones with different PCBs, PCB design, CPU, flash chip, gate up, software, etc.
Flash file version is important for a Chinese phone?
It’s very, very important for a Chinese phone because, though you lost your original (when manufacture company published the phone) flash version or don’t know which file is in it the first time, you got problem when you flash your phone.
Flashing with the wrong version/model flash file, you get this type of problem-
1. Flash done, but phone dead
2. white screen (no incoming/outgoing call)
3. white screen (with incoming/outgoing call)
4. Keypad not work
5. Sim not valid
6. Sim blocked
7. Phone hangs after powering on
8. No network
9. Have a network but show an emergency (this problem also occurs for a power IC, a bad connect SIM, or a SIM connector problem)
10. The phone restarts continuously.
etc.
Which tool or device?
Many free tool published in the market for MTK, Infineon, Ad, Spreadtrum, Sky, etc., but alwayes device give you a complete solution.
