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一台长虹SF2183彩色电视机,出现“三无”故障。开机测量电源电压+B(115V)只有50V,且不稳定。首先查出电源部分的取样电阻R551(51kΩ/0.25W)开路,如图1所示。
A Changhong SF2183 color TV, there “three no ” fault. Power measurement of the power supply + B (115V) only 50V, and unstable. First find out the power sampling resistor R551 (51kΩ / 0.25W) open, as shown in Figure 1.