海信牌TC2975D(A6机芯)彩电屏幕行幅度小,枕形失真
检查枕校电路,-25V供电正常,V462的B极0V属正常;V461的B极22V,比正常的8.2V高,E极22V,正常为10V。分析由于V461、V462截止,使枕校电路不能进入工作状态,查外围电阻R480开路,更换R480之后故障排除。
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