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例1故障现象:创维CTV—8298A型彩电每次开机,不久便自动关机。分析检修:开机测主电压140V无输出。为判断故障是在电源电路还是在负载电路中,断开三组电源负载(由于本电源有很强的稳压性能,故可断开负载开机,但不能断开140V稳压取样电路以前的电路,否则会损坏厚膜块STR—S6709)。开机后三组电源140V、25V和15V电压均正常,说明电源电路工作正常,怀疑三路负
Example 1 Symptom: Skyworth CTV-8298A color TV each boot, it will automatically shut down. Analysis and maintenance: boot the main voltage 140V no output. To determine the fault is in the power circuit or in the load circuit, disconnect the three sets of power load (due to the power supply has a strong regulator, it can disconnect the load power, but can not disconnect the 140V voltage sampling circuit before the circuit , Otherwise it will damage the thick film block STR-S6709). Three groups of power after boot 140V, 25V and 15V voltage are normal, indicating that the power circuit is working properly, suspected three negative