首先根据故障想象，判断故障应该在行部分，打开后盖,测行输出无短路.通电测行管B级无负压,翻板发现行推动管C级脱焊.补焊开机光栅正常,图像不稳定,根据本人以往经验.换TRF1239并微调.通电后试机，整机正常. |
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