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4.检修流程及故障实例(1)检修流程①不开机的检修思路(见图14)②图像不良(数字板)的检修思路(见图15)③图像不良(模拟板)的检修思路(见图16)④声音不良的检修思路(见图17)⑤电源逻辑关系图(见图18)2.故障检修实例[例1]灯闪(偶尔可以开机,但是画面不良)。分析:首先遇到此故障应先检查供电,如U1的3.3 V,U5的3.3 V,U26的2.5 V等几组电压工作正常与否。检查I2C总线电压及波形是否正常。用万用表DC×l0 V档测P2的RST脚电压是否为高电平。以上都正常则基本可以判定故障为CPU部分
4. Maintenance process and failure examples (1) Maintenance flow ① Maintenance check (see Fig. 14) ② Maintenance check of bad image (Digital plate) (See Fig. 15) ③ Maintenance check of defective image Figure 16) ④ Bad sounding troubleshooting (see Figure 17) ⑤ Logic diagram of power supply (see Figure 18) 2. Troubleshooting Example [Example 1] Flashing light (occasionally bootable, but the screen is poor). Analysis: The first encounter this failure should first check the power supply, such as U1 3.3 V, U5 3.3 V, U26 2.5 V and other voltage is working properly or not. Check whether the I2C bus voltage and waveform are normal. Use a multimeter DC × l0 V file to determine P2 whether the RST pin voltage is high. The above are normal can basically determine the fault for the CPU part