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FAQS
The mobile DVD doesn't have color when it is turned on, the settings have been adjusted and still haven't been repaired
Maintenance idea: 27M crystal oscillator is abnormal and FPC is in poor contact. In DVD, the crystal oscillator frequency is usually 27MHz, which is used for CPU
DSP, D/A and other electronic components with computing processing or storage capability provide clock signal (high frequency) internally for timing, loading, mixing, etc
Use. The clock signal is an important factor for the operation of the whole machine. Whether the clock signal is normal or not will affect the normal operation of the whole machine (usually the machine is started
Colorlessness is also caused by abnormal crystal frequency)
The working principle of this circuit is the same as that of previous DVD clock circuits. XI is clock output, connected to pin P234 of MT1389, and XO is clock output
It is connected to P233 pin of MT1389.
Solution: check whether the crystal oscillator has a differential pressure, the cable is in good condition, and replace the 27M to remove the fault.
Experience summary: Some motherboard data may be out of color due to confusion, such as 720 25X10 memory data.