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2.指示灯亮,但屏不亮的故障检修实录首先测试D5VL(5V)和D3V3(3.3V)电压产生电路的输出端,其检测方法如图9所示。其中,D5VL可以检测IC8026的②脚;D3V3可以检测IC8024的②脚。检测时发现5V和3.3V输出均为0V,测量VA电压时也为0V(正常时,VA约为70V)。此时可断定该电路没有工作,可对该路上的元器件进行检测。首先检测为其供电的PFC(功率因素校正)电路,正常时,PFC电路应输出约400V直流电压,其检测方法如图10所示(图见下页)。检测时,发现400V的PFC
2. Indicator light, but the screen does not shine troubleshooting Record first test D5VL (5V) and D3V3 (3.3V) voltage generating circuit output, the test method shown in Figure 9. Among them, D5VL can detect IC8026 ② feet; D3V3 IC8024 can detect ② feet. Detection found 5V and 3.3V output are 0V, VA voltage measurement is also 0V (normal, VA is about 70V). At this point you can conclude that the circuit does not work, you can detect the components on the road. First, check the power supply PFC (Power Factor Correction) circuit, normally, the PFC circuit should output about 400V DC voltage, the detection method shown in Figure 10 (see the next page). At the time of testing, a 400 V PFC was found