some info on the MTK

[Dorian]

MTK chipset, does not boot repair

MTK chipset, does not boot repair boot the working conditions of mobile phones, mobile phones should continue to boot normally required to have the following four conditions: First, the power IC is working properly; second, the clock is working properly and the third is logic normal, four is the software work normal.


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1. the power IC is working properly

(1) MTK power supply IC supply to normal, the need for operating voltage, ie the battery voltage or external power supply voltage;
(2) turn trigger signal, MTK start trigger signal is low, start trigger signal is sent to the power supply IC, press the start button, the start trigger signal will have a level of change (change from high is low).
(3) Power IC of the general integration of multiple sets of controlled and non-controlled voltage regulator circuit is triggered when a start signal, the power regulator IC's output should be multi-voltage output.
Power 18 # (VMEM) = 2.8V, for the font.
Power 20 # (VDD) = 2.8V, for the logic circuits.
Power 22 # (VRTC) = 1.5V, for the real-time clock circuit.
Power 24 # (RESET) = 2.8V, reset voltage power supply 25 # (VTCXO) = 2.8V, for the 13M crystal 4 #.
Power 27 # (AVDD) = 2.8V, for the logic circuits.
Power 30 # (VREF) = 1.3V, reference voltage.
Power 33 # (PWRBB) = 1.5V boot sustaining voltage, direct CPU-C1 feet.
Power 48 # (VCORE) = 1.8V, for the CPU.9
(4) boot the maintenance of the signal from the CPU, power supply IC to maintain signal only with the boot in order to maintain the output voltage

[Dorian]

2. the clock circuit
A normal system clock. CPU clock signal is the basis for data processing according to the beat, cell phones in the clock circuit, there are two: one is the clock VCO module, containing the components and crystal oscillation circuit.When the normal power supply connected, may self-oscillation, the formation of 26MHZ signal output; the other is from IF IC with crystals, IF IC get power is from the internal oscillator circuit for the crystal oscillator, the output from the IF amplification module. . 26MHZ clock in general through the capacitance, resistance or amplifier circuit supply CPU, There is also the supply of radio-frequency phase-locked loop circuit as the basic clock signal.

[Dorian]

3. logic is working properly

(1) The normal working power source. Press the start button, the power supply IC output and stable power supply voltage for the logic circuit, including the CPU, FLASH, and clock circuitry.
(2) a normal reset signal, when the CPU just for the power supply when the internal state of all registers in a random and can not properly run the program, therefore, CPU reset signal must be reset. CPU-reset the mobile phone side is generally low reset, that is, after a certain clock cycle, so that a variety of registers within the CPU is cleared, and then up again here as the high voltage, so that CPU to run programs from scratch.
(3) The logic circuits include CPU, FLASH, CSP. When the CPU has the power, clock and reset three conditions, through the chip select signal and FLASH contact, through the data bus and address bus to transmit data with each other.
(4) The software is a CPU controlled cell phone boot procedures with a variety of functions, procedures and set the boot stored in FLASH in, MTK's pre-FLASH data such as CPU, such as 6205,6217,6218,6219 not encrypted, the CPU, such as post-6223 , 6225,6226 BA, 6228,6230 are all encrypted FLASH data, data encryption is not compatible with the models of mobile phones. Thus, if the software or software errors may result in wrong cell phone does not boot. Of course, the software may also be caused by abnormal non-network, is not displayed, functional disorders, crashes, boot restart, and many other failures.

[Den Bagus]

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