测LC863328A/5脚时按音量键电压有变化.说明LC863328A正常.而LA4285的5脚没有电压.将V201/2SC1815拆除后故障排除.实测LA4285各脚电压为1/5.3V  2/3/4/5/0V 6/6V 7/6.2V 8/0V  9/6.2V 10/14V.检测V201/2SC1815已损坏换后故障排除.资料来源:www.520101.com