电子鱼 发表于 2009-5-26 17:57:38

长虹LS10整机信号流程分析及关键点测量数据(图)

<P>&nbsp;&nbsp;&nbsp; 本章主要介绍长虹液晶电视(LS10机芯)的图象信号的接收及处理、声音信号的接收及处理和整机系统控制过程、整机供电系统。 <BR>一、图像信号流程: <BR>AV/S和经过主调谐器解调后的TV视频(CVBS)信号通过TV板转接送入至视频解码芯片SAA7117AH进行解码和A/D变换后,输出CCIR656格式信号经过MST5151进行数字处理和格式变换,将不同的输入格式变成统一的上屏信号格式。 <BR>PC和HDTV(YPbPr)及HDMI信号直接送入MST5151进行处理形成统一的上屏信号。 <BR>二、伴音流程: <BR>&nbsp;&nbsp; TV伴音:射频信号经主调谐器解调后输出音频信号,再输入到NJW1142进行音效处理,输出的音频信号进入到D类功放TA2024/PT2330中进行功率放大,最后送入扬声器。 <BR>&nbsp;&nbsp; AV2/S伴音:经过AV输入的音频信号直接输入到NJW1142进行音效处理,输出的音频信号进入到D类功放TA2024/PT2330中进行功率放大,最后送入扬声器。 <BR>&nbsp;&nbsp; PC/HDMI、YPBPR、AV1的伴音经过74HC4052选通输入到NJW1142进行音效处理,输出的音频信号进入到D类功放TA2024/PT2330中进行功率放大,最后送入扬声器 。 <BR>&nbsp;&nbsp; HDMI的信号先输入到MST5151中将数字音频分量分离出来,然后在M4334J中进行解调,再经过74HC4052选通输入到NJW1142进行音效处理,输出的音频信号进入到D类功放TA2024/PT2330中进行功率放大,最后送入扬声器。 <BR>三、整机供电系统: <BR>&nbsp;&nbsp; 从电源板共有4路电压输出,+24V,+12V,+5V和+5V MCU。其中+24V供LCD屏的逆变器使用,+12V供功放使用,+5V通过LDO(如LM1117、LM1084等)变成3.3V、2.5V和 1.8V,供IC使用,液晶屏的图象驱动模块的电压则由+24V经DC-DC变化后提供。在待机状态下+24V、+12、+5V会被关断,而+5V MCU仅向MCU、红外接收器、EEPROM等器件供电。 <BR>1.整机电源组成与分布:<BR><A href="http://www.520101.com/Files/otherimages/2008-7/2008072220130838600.jpg" target=_blank><IMG style="CURSOR: pointer" border=0 alt=LS10机芯 src="http://www.520101.com/Files/otherimages/2008-7/2008072220130838600.jpg" width=535 onload="return imgzoom(this,600);" target="_blank"></A><BR><A href="http://www.520101.com/Files/otherimages/2008-7/200807222013553511.jpg" target=_blank><IMG style="CURSOR: pointer" border=0 alt=点击放大 src="http://www.520101.com/Files/otherimages/2008-7/200807222013553511.jpg" width=535 onload="return imgzoom(this,600);" target="_blank"></A><BR>&nbsp;</P>
<P>2、<STRONG>主板上各稳压管管脚电平一览表</STRONG><STRONG> </STRONG></P>
<P>
<TABLE border=1 cellSpacing=0 cellPadding=0 width=569>
<TBODY>
<TR>
<TD vAlign=top width=55><BR>位号</TD>
<TD vAlign=top width=156>
<P>型号</P></TD>
<TD vAlign=top width=72>
<P>PIN1(V)</P></TD>
<TD vAlign=top width=72>
<P>PIN2(V)</P></TD>
<TD vAlign=top width=72>
<P>PIN3(V)</P></TD>
<TD vAlign=top width=71>
<P>PIN4(V)</P></TD>
<TD vAlign=top width=70>
<P>PIN5(V)</P></TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U400</P></TD>
<TD vAlign=top width=156>
<P>LM1117-1.8V</P></TD>
<TD vAlign=top width=72>
<P>0</P></TD>
<TD vAlign=top width=72>
<P>1.8</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=71>
<P>1.8</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U206</P></TD>
<TD vAlign=top width=156>
<P>LM10841S-3.3</P></TD>
<TD vAlign=top width=72>
<P>0</P></TD>
<TD vAlign=top width=72>
<P>3.3</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=71>
<P>3.3</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U207</P></TD>
<TD vAlign=top width=156>
<P>AZ1084S-ADJ</P></TD>
<TD vAlign=top width=72>
<P>0.5</P></TD>
<TD vAlign=top width=72>
<P>1.8</P></TD>
<TD vAlign=top width=72>
<P>3.3</P></TD>
<TD vAlign=top width=71>
<P>1.8</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>UA207</P></TD>
<TD vAlign=top width=156>
<P>AZ1084S-ADJ</P></TD>
<TD vAlign=top width=72>
<P>3.3</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=72>
<P>9</P></TD>
<TD vAlign=top width=71>
<P>5</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U701</P></TD>
<TD vAlign=top width=156>
<P>AZ1084S-ADJ</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=72>
<P>9</P></TD>
<TD vAlign=top width=72>
<P>12</P></TD>
<TD vAlign=top width=71>
<P>9</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U204</P></TD>
<TD vAlign=top width=156>
<P>LM1117-3.3</P></TD>
<TD vAlign=top width=72>
<P>0</P></TD>
<TD vAlign=top width=72>
<P>3.3</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=71>
<P>3.3</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U402</P></TD>
<TD vAlign=top width=156>
<P>LM1117-3.3</P></TD>
<TD vAlign=top width=72>
<P>0</P></TD>
<TD vAlign=top width=72>
<P>3.3</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=71>
<P>3.3</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U203</P></TD>
<TD vAlign=top width=156>
<P>LR1117/A-2.5</P></TD>
<TD vAlign=top width=72>
<P>0</P></TD>
<TD vAlign=top width=72>
<P>2.5</P></TD>
<TD vAlign=top width=72>
<P>5</P></TD>
<TD vAlign=top width=71>
<P>2.5</P></TD>
<TD vAlign=top width=70>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=55>
<P>U300</P></TD>
<TD vAlign=top width=156>
<P>LM2596-12/5</P></TD>
<TD vAlign=top width=72>
<P>24</P></TD>
<TD vAlign=top width=72>
<P>12/5</P></TD>
<TD vAlign=top width=72>
<P>0</P></TD>
<TD vAlign=top width=71>
<P>12/5</P></TD>
<TD vAlign=top width=70>
<P>0</P></TD></TR></TBODY></TABLE></P>
<P><STRONG>四</STRONG>、<STRONG>主板上各主要元器件及插座位置及定义:</STRONG><STRONG> <BR><A href="http://www.520101.com/Files/otherimages/2008-7/2008072220161466261.jpg" target=_blank><IMG style="WIDTH: 459px; CURSOR: pointer" border=0 alt=点击放大 src="http://www.520101.com/Files/otherimages/2008-7/2008072220161466261.jpg" width=535 onload="return imgzoom(this,600);" target="_blank"></A><BR>&nbsp;</STRONG></P>
<P>插座定义</P>
<P>
<TABLE border=1 cellSpacing=0 cellPadding=0 width=643>
<TBODY>
<TR>
<TD vAlign=top width=43><BR><STRONG>序号 </STRONG></TD>
<TD vAlign=top width=72>
<P><STRONG>位号 </STRONG></P></TD>
<TD vAlign=top width=156>
<P><STRONG>连接对象 </STRONG></P></TD>
<TD vAlign=top width=372>
<P><STRONG>功能描述 </STRONG></P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>1</P></TD>
<TD vAlign=top width=72>
<P>JP503</P></TD>
<TD vAlign=top width=156>
<P>接TV板</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>2</P></TD>
<TD vAlign=top width=72>
<P>JP512</P></TD>
<TD vAlign=top width=156>
<P>接TV板</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>3</P></TD>
<TD vAlign=top width=72>
<P>JP602</P></TD>
<TD vAlign=top width=156>
<P>接扬声器</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>4</P></TD>
<TD vAlign=top width=72>
<P>JP601</P></TD>
<TD vAlign=top width=156>
<P>接扬声器</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>5</P></TD>
<TD vAlign=top width=72>
<P>JP508</P></TD>
<TD vAlign=top width=156>
<P>接侧置AV端或耳机板</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>6</P></TD>
<TD vAlign=top width=72>
<P>JP901</P></TD>
<TD vAlign=top width=156>
<P>DMP供电端</P></TD>
<TD vAlign=top width=372>
<P>数码相框功能仅限LT3219P/ LT3719P使用</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>7</P></TD>
<TD vAlign=top width=72>
<P>JP203</P></TD>
<TD vAlign=top width=156>
<P>接电源板</P></TD>
<TD vAlign=top width=372>
<P>12V,12V,GND,GND, GND,GND,24V,24V</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>8</P></TD>
<TD vAlign=top width=72>
<P>JP204</P></TD>
<TD vAlign=top width=156>
<P>接电源板</P></TD>
<TD vAlign=top width=372>
<P>STANDBY,GND,GND,5V,5V,5VMCU,GND,GND,+12V,+12V</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>9</P></TD>
<TD vAlign=top width=72>
<P>JP105</P></TD>
<TD vAlign=top width=156>
<P>接显示屏</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>10</P></TD>
<TD vAlign=top width=72>
<P>JP201</P></TD>
<TD vAlign=top width=156>
<P>上屏(屏上逆变器输入)</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>11</P></TD>
<TD vAlign=top width=72>
<P>JP202</P></TD>
<TD vAlign=top width=156>
<P>上屏(屏上逆变器输入)</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>12</P></TD>
<TD vAlign=top width=72>
<P>JP200</P></TD>
<TD vAlign=top width=156>
<P>接电源板</P></TD>
<TD vAlign=top width=372>
<P>GND,GND,GND,24V,24V,24V</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>13</P></TD>
<TD vAlign=top width=72>
<P>JP702</P></TD>
<TD vAlign=top width=156>
<P>接K板</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>14</P></TD>
<TD vAlign=top width=72>
<P>JP701</P></TD>
<TD vAlign=top width=156>
<P>接遥控板</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>15</P></TD>
<TD vAlign=top width=72>
<P>JP700</P></TD>
<TD vAlign=top width=156>
<P>接程序工装,写入程序</P></TD>
<TD vAlign=top width=372>
<P>主程序写入</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>16</P></TD>
<TD vAlign=top width=72>
<P>JP100</P></TD>
<TD vAlign=top width=156>
<P>VGA端子</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>17</P></TD>
<TD vAlign=top width=72>
<P>JP102</P></TD>
<TD vAlign=top width=156>
<P>VGA音频输入</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>18</P></TD>
<TD vAlign=top width=72>
<P>JP103</P></TD>
<TD vAlign=top width=156>
<P>HDMI端子</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>19</P></TD>
<TD vAlign=top width=72>
<P>JP101</P></TD>
<TD vAlign=top width=156>
<P>高清输入端子</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>20</P></TD>
<TD vAlign=top width=72>
<P>JP506</P></TD>
<TD vAlign=top width=156>
<P>高清音频端子(左声道)</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>21</P></TD>
<TD vAlign=top width=72>
<P>JP505</P></TD>
<TD vAlign=top width=156>
<P>高清音频端子(右声道)</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>22</P></TD>
<TD vAlign=top width=72>
<P>JP507</P></TD>
<TD vAlign=top width=156>
<P>S端子</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>23</P></TD>
<TD vAlign=top width=72>
<P>JP509</P></TD>
<TD vAlign=top width=156>
<P>接DVD AV输出</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>24</P></TD>
<TD vAlign=top width=72>
<P>JP510</P></TD>
<TD vAlign=top width=156>
<P>接外部AV输入</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>25</P></TD>
<TD vAlign=top width=72>
<P>JP104</P></TD>
<TD vAlign=top width=156>
<P>接侧置AV端</P></TD>
<TD vAlign=top width=372>&nbsp;</TD></TR>
<TR>
<TD vAlign=top width=43>
<P>26</P></TD>
<TD vAlign=top width=72>
<P>JP902</P></TD>
<TD vAlign=top width=156>
<P>DMP端</P></TD>
<TD vAlign=top width=372>
<P>数码相框功能仅限LT3219P/ LT3719P使用</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>27</P></TD>
<TD vAlign=top width=72>
<P>JP800</P></TD>
<TD vAlign=top width=156>
<P>接程序工装,写入程序</P></TD>
<TD vAlign=top width=372>
<P>HDCP写入</P></TD></TR></TBODY></TABLE></P>
<P><STRONG>主要元器件说明</STRONG><STRONG> </STRONG></P>
<P>
<TABLE border=1 cellSpacing=0 cellPadding=0 width=631>
<TBODY>
<TR>
<TD vAlign=top width=43><BR><STRONG>序号</STRONG><STRONG> </STRONG></TD>
<TD vAlign=top width=71>
<P><STRONG>位号</STRONG><STRONG> </STRONG></P></TD>
<TD vAlign=top width=154>
<P><STRONG>元器件 </STRONG></P></TD>
<TD vAlign=top width=363>
<P><STRONG>功能描述</STRONG><STRONG> </STRONG></P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>A</P></TD>
<TD vAlign=top width=71>
<P>U703</P></TD>
<TD vAlign=top width=154>
<P>PT2330</P></TD>
<TD vAlign=top width=363>
<P>音频放大器</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>B</P></TD>
<TD vAlign=top width=71>
<P>U700</P></TD>
<TD vAlign=top width=154>
<P>NJW1142M&nbsp;&nbsp;</P></TD>
<TD vAlign=top width=363>
<P>音频处理器</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>C</P></TD>
<TD vAlign=top width=71>
<P>U403</P></TD>
<TD vAlign=top width=154>
<P>SAA7115HL/V1</P></TD>
<TD vAlign=top width=363>
<P>子通道视频解码器</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>D</P></TD>
<TD vAlign=top width=71>
<P>U401</P></TD>
<TD vAlign=top width=154>
<P>SAA7117AH</P></TD>
<TD vAlign=top width=363>
<P>主通道视频解码器</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>E</P></TD>
<TD vAlign=top width=71>
<P>U200</P></TD>
<TD vAlign=top width=154>
<P>K4D263238F-QC50&nbsp;</P></TD>
<TD vAlign=top width=363>
<P>帧缓存器</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>F</P></TD>
<TD vAlign=top width=71>
<P>U105</P></TD>
<TD vAlign=top width=154>
<P>MST5151A&nbsp;</P></TD>
<TD vAlign=top width=363>
<P>视频处理器</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>G</P></TD>
<TD vAlign=top width=71>
<P>U800</P></TD>
<TD vAlign=top width=154>
<P>MM502</P></TD>
<TD vAlign=top width=363>
<P>CPU</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>H</P></TD>
<TD vAlign=top width=71>
<P>U802</P></TD>
<TD vAlign=top width=154>
<P>24LC32A T/SN</P></TD>
<TD vAlign=top width=363>
<P>EEPROM</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>I</P></TD>
<TD vAlign=top width=71>
<P>U801</P></TD>
<TD vAlign=top width=154>
<P>24LC04</P></TD>
<TD vAlign=top width=363>
<P>HDCP</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>J</P></TD>
<TD vAlign=top width=71>
<P>U803</P></TD>
<TD vAlign=top width=154>
<P>PMC 25LV512</P></TD>
<TD vAlign=top width=363>
<P>Flash,整机控制程序放置于其中</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>K</P></TD>
<TD vAlign=top width=71>
<P>U101</P></TD>
<TD vAlign=top width=154>
<P>24LC02</P></TD>
<TD vAlign=top width=363>
<P>EEPROM</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>L</P></TD>
<TD vAlign=top width=71>
<P>U102</P></TD>
<TD vAlign=top width=154>
<P>24LC02</P></TD>
<TD vAlign=top width=363>
<P>EEPROM</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>M</P></TD>
<TD vAlign=top width=71>
<P>U114</P></TD>
<TD vAlign=top width=154>
<P>MC74LVX4052DR2&nbsp;&nbsp;</P></TD>
<TD vAlign=top width=363>
<P>音频通道选择切换开关</P></TD></TR>
<TR>
<TD vAlign=top width=43>
<P>N</P></TD>
<TD vAlign=top width=71>
<P>U208</P></TD>
<TD vAlign=top width=154>
<P>M4334J</P></TD>
<TD vAlign=top width=363>
<P>数字音频解码器</P></TD></TR></TBODY></TABLE></P>
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