收到同行送来的故障机壹台海信LED32K1800液晶电视,故障表现为无声音,测扬声器正常。查功放芯片NTP8212供电电容C320有12V,声音输出电感对地0V,正常1.4V。查3.3V供电容c332为2.85V不正常,断开L1057一端直接接到3.3V供电上试一切正常。 |
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