新爱华CDC-X237,开机无背光,显示正常.CD能正常播放,但声音极轻,开到最大也只能听到一点点声音.收音收不到台也无噪声.查音频处理IC IC401 L75421 VDD35脚正常应该是8V,实际只有1.5V.该电压来自Q821(2SD2012)E极,测其C极无电压输入,C极电压是由Q801(2SB1375)C极提供的.测其E极和B极电压均正常,但C极无输出,拆下B1375检测其BE极已开路.更换同型号管子后故障全部排除.
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