创维34SG9000（5P21机芯）受潮引发的故障

李山风

<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 84pt; mso-char-indent-count: 8.0; mso-char-indent-size: 10.5pt"><FONT size=3><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">创维</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">34SG9000</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5P21</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">机芯）受潮引发的故障</SPAN></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 52.5pt; TEXT-INDENT: -52.5pt; mso-char-indent-count: -5.0; mso-char-indent-size: 10.5pt"><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'"><FONT size=3>故障现象：不开机指示灯亮一会儿开机——关机——开机——有雪花点但无台，换频道时出现红屏左全黑至右逐渐黑条变小至屏幕右边全红，随时间增加黑少红多至无，个别频道出现图象——所有频道全部出现图象。</FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt 52.5pt; TEXT-INDENT: -52.5pt; mso-char-indent-count: -5.0; mso-char-indent-size: 10.5pt"><FONT size=3><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">检修过程：开机时测电源电压正常，测</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">42</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">SDA</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">数据线电压</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3.8V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">正常，（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">41</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">SCL</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时钟线电压在开机时</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">正常，马上降为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">1.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。此时电视不能二次开机，一会屏幕亮后（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">41</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">SCL</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">时钟线电压为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4.0V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">正常，测</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CN600</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">排线（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">3</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">脚）中间电压为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">18V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">逐渐下降为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">14V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。经查为</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CN600</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">排线座漏电，内部已经发绿，（主板上至尾板排线，尾板为分立元件），</SPAN><FONT face="Times New Roman"> </FONT><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">换</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CN600</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">排线座后，不开机故障排除了。开机后屏幕出现灰白屏，无雪花点，一会雪花点逐渐增多行不同步，逐渐至正常。用示波器测</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">IC203<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>CD4052 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚有信号，（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">4</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚无信号逐渐有信号渐渐信号变大至正常。第二天再次检查时，测（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚（制式转换控制脚）电压正常，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">16</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">脚供电电压</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">8V</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">正常。断开</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">IC203<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>CD4052 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚（制式转换控制脚）及外围电路后，测轻微漏电。第二天再测漏电严重许多，</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">IC203<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>CD4052 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚跨越很长距离，中间只有</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R079</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">100K</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R080</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">100</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">欧），采取空中飞线方式将</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R079</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">R080</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对应串在电路中，连接</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">IC203<SPAN style="mso-spacerun: yes">&nbsp; </SPAN>CD4052 </FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">2</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">5</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚和</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">CPU</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">9</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）（</SPAN><SPAN lang=EN-US><FONT face="Times New Roman">10</FONT></SPAN><SPAN style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）脚。经此改动后故障排除。</SPAN></FONT></P>

李山风

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