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故障现象:正常收看时,常出现自动停机故障;重新开机又能收看,但又会自动停机。 分析检修:该机在收看时,经常发生不定时地随机停机故障。停机后不能再开机收看的故障称为“软三无”(无光栅、无图像、无伴音);停机复开机仍能正常收看的故障称为“假三无”。该机的故障属于后者。“假三无”故障,多发生在有“X射线保护” 的彩色电视机中,而故障的诱因又多在开关稳压电源部分。本例故障初步判断是电源故障引起过压,进而导致X射线保护电路动作而产生
Symptom: Normal viewing, often appear automatic shutdown failure; re-boot can watch, but it will automatically shut down. Analysis and maintenance: When the machine is watching, often occur from time to time random stop failure. Stop the machine can not boot after watching the failure is called “soft three no” (no raster, no images, no sound); shutdown shutdown can still watch the normal failure is called “fake three no.” The machine belongs to the latter fault. “Fake three no” failure, occurred in the “X-ray protection” color TV, and the cause of the malfunction in the switching power supply part of the more. In this case, the initial judgment is that the power failure caused by overvoltage, resulting in the action of X-ray protection circuit