收到同行送来的故障机壹台TCL L32F19液晶彩电，故障表现为上电后三无。通电试机，电源指示灯不亮。拆机检查，副电源整流二极管DB3负极电压为0V，但300V电压已送到副电源开关变压器T2初级。测T2初级VCC供电整流二极管DB2及限流电阻RB15、R7均正常，怀疑到电源芯片IC9( FSQ510 )损坏。更换IC9后试机，DB3负极电压升至3.3V，二次开机，图像、声音均正常。 |
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