| 故障表现为：灰屏 检修与分析：开机有声无图灰屏，把主板上机架图像正常查看屏参也对，于是故障锁定在逻辑板和屏上，测逻辑板供电12V正常。U1TPS65161供电12V也有⑧叫升压只有11V不正常，无意触摸IC发现很烫，于是更换U1结果故障一样，还是烫手，查外围升压电路发现D2二极管SR34漏电，更换D2压U1的⑧脚电压升到15V温度也正常，接上信号图像正常，故障机修到这里，终于修好值得探讨。 |
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