【2017年整理】TCL_Pixi4-4项目RF不良分析报告.ppt

TCL Pixi4-4 项目RF干扰跳点分析报告 制作人：黎志贤 江西合力泰科技有限公司 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 一、不良现象 TCL Pixi4-4(CBF6104)项目样品整机可靠性测试中，RF干扰致使屏幕跳点漂移。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 二、分析过程 会议商讨后，从TP软件和硬件2个方面同时进行调试与分析 1，软件调试。 IC厂研发AE针对不良现象 采集数据，分析Log优化程序验 证还是跳点。软件优化不能改善 天线干扰。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2，硬件排除验证。 割断按键通道的银浆线，验证通话时RF信号频率与按键是否发生耦合而干扰TP工作，验证NG. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 刮掉按键面板油墨，油墨是导电体，验证天线工作的信号是否通过油墨区进入到TP，对TP功能产生干扰，验证NG. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 用铜箔纸包住FPC绑定区与EMI区，验证EMI电磁膜对电磁干扰的屏蔽效果，测试后不是特别稳定，跳点会概率性复现。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 用铜箔纸包住IC并接地，验证射频信号是否进入IC对TP产生干扰。效果有所改善，但重压FPC绑定区域会跳点。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 用铜箔纸包住EMI和FR4补强区并接地，反复测试，跳点没有复现。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 三、结论 电容屏对电磁信号比较敏感，FPC上附上EMI膜可以有效的抑制外来高频电磁波的干扰，减小对信号的干扰，形成一种滤波的作用。 当EMI对外界的电磁干扰不能减弱杂质并屏蔽掉，就会造成对射频信号的干扰而产生副作用。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 四、硬件改善 硬件改善由硬件和结构的同事来完善，谢谢！！ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.