长虹背投彩电会聚调整技术解析:从普通到精显的演进与优势
1。第1部分:Changhong后方投影颜色电视收敛调整Changhong后投影颜色电视自从市场上推出以来拥有三代产品。第一代产品是普通的交错后投影颜色电视,其代表51PT28A和43PT28A型号,场频率为50Hz。由于普通的后投影扫描和信号处理采用传统的接收和处理方法,因此不可避免地会遇到诸如狭窄的电视信号传输通道引起的较差的清晰度,线条闪烁,线爬行,线抖动,线条粗糙度,线条粗糙度,线条扫描线等缺陷。为了克服大区域闪烁,互线闪烁,差的图像清晰度和普通后投影扫描格式带来的粗糙线条的问题,Changhong Company开发了由51pdt18和43pdt18型号代表的第二代细饰面后投影电视。细播放后投影颜色电视也称为频率加倍后投影颜色电视,其场频率是普通后投影的两倍,即100Hz,因此细播放颜色电视也称为100Hz后投影。扫描格式有两种类型,用户可以从遥控器中选择。
2。这两种格式,一种是100Hz的隔行扫描,另一种是50Hz进行性扫描。尽管频率的场频率加倍和线扫描线也相应增加,因为仍然使用了交错扫描,但仍然存在缺点,例如Interline闪烁和粗线线性。尽管50Hz的渐进式扫描可以解决等问题,例如在行,粗线扫描线和抖动之间闪烁,但仍然存在某些行闪烁。由于人眼无法感知闪烁的临界频率,因此闪烁的临界频率低于50Hz,因此当场频率为50Hz时,有时您仍然会感到有些闪烁。因此,第二代后投影颜色电视不是真正的渐进高清颜色电视。因此,Changhong Company基于第二代Precision Precision Disperion Specision Reaction Profaction Color TV Control Technology开发了第三代真正的渐进式扫描高清,高亮度和反闪烁的新高科技控制技术。 jingxianwang后投影颜色的扫描格式是渐进的扫描,场频率为60hz,线扫描线为1250。
3。彩色电视扫描格式的转换主要使用美国NDSP芯片公司开发的非线性数字转换控制技术电路组件。普通的彩色电视场扫描频率从50Hz转换为60Hz,有效地消除了线际闪烁。同时,线扫描线从每一帧的625条线变为每一帧的1250行,这极大地提高了图像的清晰度,并完全消除了互线闪烁和粗线扫描线的问题。普通的后投影颜色电视使用Changhong CH8机芯的运动等。该机芯的信号处理块使用TDA8844和现场扫描块颜色电视TV TDA8351,并且数字收敛电路使用数字先锋收敛组件。从普通后投影颜色电视信号处理块的组成来看,在修复普通的后投影故障时,您可以参考Changhong CH10运动故障检查方法。 Changhong Jingxiong后投影/良好视力国王后投影正常信号处理块采用TDA9320,可变频率信号处理块采用TDA9330,现场扫描块
4。采用TDA8351。频率加倍组件采用了飞利浦开发的频率加倍电路。频率加倍电路采用了美国公司制造的频率加倍组件。这两个型号的融合电路与普通的后投影收敛电路相同,并且两者都使用先锋融合电路。由于Jingxi/Jingxi Wang后投影颜色电视的信号处理块与Changhong频率双色电视DT2000的信号处理块相同,因此在修复此系列后投影颜色电视时,您可以参考DT2000电路原理和故障维护方法。无论是普通的还是罚款/罚款/罚款国王的后投影,由于三种类型的后投影收敛和调试使用相同的收敛电路,因此可以从彼此中引用过故障确定和维护方法,并且收敛和调试相似。主要区别在于,控制系统电路是不同的,并且使用了遥控器,因此调试方法相似,但是三个的特定调试仍然不同。为什么会收敛调试?这是因为普通彩色管的三个电子枪,红色,绿色和蓝色都安装在同一管脖子上
5。由于三个电枪的不同排列,电子枪的挠度以及电子束在通过管颈到达屏幕时也会受到地球磁场的影响,当电子束到达屏幕时,轨迹也会发生变化,因此轨迹在屏幕上发生变化,因此在屏幕上无法获得纯底色光栅。除了改善开发管制造技术外,还必须重复调整挠度线圈在管颈上和颜色上的偏转螺旋,以获得单个纯基颜色光栅。后投影颜色电视使用三个独立的投影管,屏幕上形成了固体光栅,但是由于三个投影管的不同放置位置(中间是绿色投影管,两侧是红色和蓝色投影管),结果是由三个投影管形成的单色图片。在反光屏幕上反射在投影屏幕上后,红色,绿色和蓝色不会重叠,并且图片严重扭曲了。为了使三个单色图像重叠成令人满意的图像,后投影颜色电视需要调整三个投影仪的挠度位置,以使其通过调整三个投影仪的偏转位置尽可能多地制造红色,绿色和蓝色。
6。除了在屏幕中心重叠外,还必须设置专有的数字收敛调整电路,以分别在东部,西,南部,南部和北方的方向生成行场收敛信号,并添加到投影管收敛线圈中。通过调整行和场数字脉冲信号的幅度和相位,可以更改投影管电子束轨迹,从而在屏幕上实现三个单色光栅的完全重叠。这是后投影颜色电视和普通彩色电视的收敛和调整之间的区别。长春后投影颜色电视的收敛调试方法是:普通的后投影颜色电视收敛调整(51PT28A)1。输入收敛状态到收敛性调试方法:使用用户的遥控器来最大程度地减少声音,然后按Mute键,然后按Mute键,然后按Mute键,然后按机器的“菜单”键。 “ S”字符显示在屏幕上,表明已经输入了维护“ S”调试状态;然后按遥控器的“收敛”键,并在屏幕上显示收敛网格信号,表明已输入收敛调试状态。收敛调试和罚款模式。融合调试是必要的
7。粗调节模式后,输入精细的调整模式。调试时,首先将绿色调整为图中所示的状态,然后分别重叠蓝色和绿色,红色和绿色。在调试过程中,按“菜单”键随时存储数据。后投影颜色电视收敛调整分为两种类型:PAL和NTSC。为了正式显示后投影颜色电视,必须在PAL和NTSC信号下单独浓缩并调整它们。调整收敛性时,色度将其放置在中间(31);亮度放在67(42)中;对比度在75(48)中。注意:该图可用作43PT28A和51PT28A的参考。在实际的调试过程中,收敛的网格与此标准网格不同,只能用作参考。 2。介绍收敛状态1中遥控按钮的功能。“收敛”键:输入或退出收敛调试状态。 2。“显示”键:切换测试网格信号的颜色。 3。“图片中的图片”键:切换测试平方信号的光标颜色,
8。在良好的调整模式下,光标颜色是您需要调整的颜色。 4。“图片”键:切换粗糙和精细的调整模式。连续按此键时,在屏幕上显示循环的“ Fine Mode”和“ DCRH”。当屏幕显示“ Fine Mode”时,将显示精细的调整模式,并在屏幕显示“ DCRH”时显示粗调节模式。在粗糙的调整模式下,按“通道添加和减去”键选择调整项目,然后按“卷添加和减去”键以调整数据。 5。“多个窗口”键:开关点或行调整模式。当在屏幕上显示“点锁”或“线路锁定”时,可以通过“通道添加,减去”键和“音量向上并减去”键调整光标所定位的点。当“点移动”和“线移动”显示在屏幕上时,光标被向上移动,向下,向下,左右移动,穿过“通道添加,减去”键,然后“音量上升并减去”键。 6。“菜单”键:保存数据。屏幕显示“ D”
9。当Ata确定时”,这意味着数据已存储。收敛性,光标位于融合测试信号的中心点和图像信号的中心。“静音”键:锁定或激活光标。并减去选择项目的密钥,然后按卷以添加和减去数据调整数据。 (2)调整绿线大小(KGH1)(3)调整
10。绿色场倾斜度(kgv3)(4)调整绿色场振幅(kgv2),以使绿色收敛振幅,钳状形状,约70点和线符合图1。4的要求。按“图片”键,以绿色的微调。按“图片中的图片”键将光标切换为绿色。按“多个窗口”键选择点或行的调整。当屏幕显示“线移动”或“点移动”时,按音量增加,减法键和通道增加,减去键以向左,右,上下移动光标;当屏幕显示“点锁”或“线路锁定”时,按音量增加,减法键和通道增加,减去键,以调整分别向上,向上,上下的点或线的微调数据。注意:1。在细微的调整过程中,当屏幕显示为“点锁”或“线路锁”时,光标为
11。红色,绿色和蓝色。当屏幕分别显示“线移动”或“点移动”时,光标是原始颜色。 2。调整时,按照涡流的顺序从中心点到周围环境。换句话说,首先调整屏幕中心的点,然后调整周围的点,依此类推。 3。如果调整了一个点,则增加其相邻未调整点的细胞调整误差会增加,则应调整该点,以使相邻未调节点的误差在允许范围内。否则,当可以将此相邻点的数据调整为最大值时,将无法满足要求。 4。在调试期间调整的数据可以通过按“菜单”键存储。当屏幕显示“数据确定”时,将存储数据。请注意经常存储数据。 5。在收敛状态下红色收敛的调整,按“显示”键切换到红色和绿色的正方形状态。按“图片中的图片”键将光标切换为红色。根据
12。“图片”键使屏幕将“ DCRH”显示为粗调节模式。调试序列是:1。调整“ DCRH”和“ DCRV”收敛的粗略调整,以使红色和绿色的行和田间中心重叠。 2。调整红排倾斜度(KRH3)3。调整红行线性(KRH2)4。调整红行宽度(KRH1)5。调整红色场钳式校正(KRV2)6。调整红场键盘校正(KRV1)7。调整红场倾斜度(KRV4)8。 70枕头校正与绿色融合线一致。按“图片”键将屏幕显示“ Fine Move”到FINE调整模式中。红色收敛的精细调整方法与绿色相同,最后使红收敛线与绿色收敛线一致,屏幕网格为黄色。按“菜单”键保存数据。 6。蓝色俱乐部
13。调整聚合状态的聚会,按“显示”键使屏幕以红色和蓝色正方形显示,按“图片中的图片”键将光标切换为蓝色,按“图片”键,以使屏幕显示“ DCRH”输入粗略调整模式。调试序列是:1。按“ DCRH”出现时,按“图片”键到达“ DCRH”和“ DCBV”,按Channel添加和减法键选择“ DCBH”和“ DCBV”,然后按音量添加和减法键,以使绿色和蓝色收敛行和场中心重叠。 2。调整蓝行倾斜度(KBH3)3。调整蓝行线性(KBH2)4。调整蓝行宽度(KBH1)5。调整蓝色场钳式校正(KBV2)6。调整蓝色场键石校正(KBV1)7。振幅,枕头校正以及70附近的点和线与绿色融合线一致。按“图片”键制作
14。屏幕显示“罚款模式”并进入精细的调整模式。蓝色收敛的精细调整方法与绿色相同。最后,蓝色收敛线和绿色收敛线完全重叠。屏幕网格是青色。按“菜单”键保存数据。收敛调整分为粗糙和精细的调整。通常,用户会在门上调试。仅需要收敛和精细调整。无需执行融合和粗略调整。因为颜色电视的位置只会导致图片的局部收敛,并且不会引起严重的收敛失真。仅通过更换投影仪或收敛板,或输入收敛和调试状态,清除工厂收敛和调试数据“ 0”就会导致严重的收敛失真(图片也严重变形,并且在屏幕上显示的图片显示了一张没有重叠的红色,绿色和蓝色的图片)。目前,需要收敛和精细调整。附件:松下收敛电路生产的后投影颜色电视(例如51PT18和43PT18)在收敛调试与先驱收敛调试之间具有一些相似之处,其区别在于,遥控器上的功能是
15。密钥代表的含义不同,但是调整方法类似于先锋收敛和调整。输入收敛性和调试状态和保存数据与先锋收敛相同。在松下收敛调试期间,远程控制功能的功能按钮:1个图片键:切换收敛平方。 2显示键:切换光标颜色。 3个AV键:选择点,线,表面厚度和精细调整。 4静音键:锁定光标。 5菜单密钥liyin键:存储数据。首先按菜单键,然后按Liyin键存储数据。 6仍然键:召集视频图像信号(与51PT28A的PAV键相同)。 Changhong Jingxiong/Jingxiong Wang后方投影仪电视收敛调试方法1。输入收敛调试状态。使用Model K9E遥控器,转动卷0,然后按遥控器的“静音”键,直到出现白色“静音”字符(字符是红色,绿色和蓝色时,当收敛且未良好调整时为蓝色),然后按机器的“菜单”键。屏幕上的总线数据表明已输入维修和调试状态。
16.按遥控器的“返回”键在维护和调试状态中输入融合的调试状态。收敛的测试网格显示在屏幕上,这意味着进入融合的调试状态。 51pdt18 frequency double-frequency rear projection (fine display) color TV is divided into 9 convergence and debugging modes, namely: 1.pal progressive scanning mode, 2.pal motion compensation mode, 3.ntsc progressive scanning mode, 4.ntsc motion compensation mode, 5.dvdpal motion compensation mode, 6.dvdpal progressive scanning mode, 7.dvdntsc progressive scanning mode, 8.dvd NTSC运动补偿模式和9.VGA模式。 PAL或NTSC信号分为三种格式调试状态:PAL,NTSC和VGA。 DVD下的PAL或NTSC信号仅需要接收DVDPAL函数DVD NTSC信号,并且在收敛的调试状态下,按“ Liyin键”即可转动T
17.复制VPAL或TVNTSC收敛调试。如果图像中心与屏幕中心没有重叠,则可以进行适当的数量并收敛初始阶段调试以调整并重叠。在收敛和调试过程中,请勿按图形键清除数据“ 0”。注意:在“ S”模式下,请勿随机移动参数“ init”项目,否则将初始化出厂维护数据和收敛初始相值。 2。遥控状态中遥控功能键的功能:表(1)列出了Jingxi和Jingxiwang后投影远程控制功能键在收敛状态下的功能和差异。 Table (1) Control key name fine display k9e fine display king k9fk9e return on entry or exit convergence adjustment key return key same as left lock or activate cursor mute key and left av convergence initial phase adjustment menu av key and left clear data picture key without this key point or line adjustment mode switching digital key and left convergence coarse or fine adjustment mode switching image mode switching key quality key exit "s"
18.模式屏幕仍然关键图像钥匙菜单存储数据菜单键菜单键图和收敛性测试网格信号在图片键中叠加图片,而无需此键光标颜色开关,没有此键收敛测试网格线颜色开关显示键数据复制liyin键liyin键表(1)显示了罚款和微调的远程远程远程远程控制范围。要调试Jingxi和Jingxiwang Huiju,您必须使用K9E遥控器,而不是K9F遥控器。当然,K9F遥控器上的某些功能键也可以在维护模式下进行调整,但是使用此密钥,不可能完全调整收敛性并调试收敛和浓度,因此不能将颜色电视远程控制K9E的收敛性和浓度用于收敛和调试。 3。收敛调试有两种类型的收敛调试。一个是尚未更换收敛板。由于电视位置的移动引起的收敛变化,您只需要输入收敛状态并进行收敛良好调整即可。一个是由收敛板替换引起的收敛失真
19。目前,必须对红色,绿色和蓝色收敛网格进行相位调整以及粗略调整。注意:如果字符中的两个字符在后投影收敛模式中显示为“ 5”,则意味着电视信号的颜色格式在PAL格式中处于收敛性调试中。如果是6,则表示颜色格式在NTSC系统中。精细浏览颜色电视:5N显示在屏幕上,表明PAL100中的隔行扫描模式; “ 6n”是NTSC120的交错扫描模式; “ 5p”是PAL50的渐进扫描模式; “ 6p”是NTSC60的渐进扫描模式。当显示DVD下的四个模式时,字符的显示方式与上面的四个模式相同。 “ V”是指VGA模式。这些字符在下面描述的OSD显示中省略。 Jingxiong King和Jingxiong收敛性显示不同,不同模型的显示器不同。在PAL100交织模式中的收敛调试(细细显示系列:
20。在收敛严重扭曲之后)接收到5CH或TVPAL信号,将频率加倍模式放在反线闪烁,并将音量设置为最小值。按MUTE键到红色静音角色(即白色),然后按本地菜单键进入S模式。此时,按返回键输入收敛调试状态。屏幕上出现红色收敛方形,然后通过显示键切换到绿色测试网格信号。 1。按图形键清除IC RAM中6个通道的厚度调整数据。如果仅执行本地位置收敛调试,则不会执行此步骤(即电视位置移动引起的收敛失真)。建议在维修过程中不要调试此项目。 2。调整绿色和安静的融合(融合中心,与本质显示的方法相同,与本质显示王相同)。当收敛严重失真(例如更改收敛板)时,可以执行此步骤。接收TVPAL测试信号或5CH信号(工厂信号)并输入维护状态
21。按“返回键”输入收敛调试状态,然后重复按“ show键”以选择绿色融合平方信号,然后按“图片中的图片”键以覆盖视频图像和收敛测试平方信号。此时,按“图片模式开关”键。当出现“ 5ndcrh”字符(粗调节)时,请按“添加或减去”键选择“ dcgh”(“ dcgv”绿色水平或垂直调整),然后按“音量向上或减去”键,以使5ch视频测试图像或电视图像的绿色行(field)在屏幕的中心。按“图片中的图片”键来消散视频图像或图像信号(此项目是原始先锋的收敛调试中的收敛性和对齐方式)。显示了同样的收集和匹配国王和绿色的方法。 3。相调整(在收敛和混乱时需要进行调整。如果您只需要收敛和罚款,就无法执行此步骤)(1)线条调整和线相调整1在绿色测试网格中,按下“图片模式选择”
22. Select "fine adjust" (fine adjustment), then press the "Main and Sub-Screen Switch" key to switch the cursor to green, then press the "Mute" key until "p lock" appears (the point cursor is locked), then the "Channel Add and Subtract" key and the "Volume Up and Subtract" key to make the fine adjustment of the h#4/v#4 point converge the gv value and display the maximum peak value on the screen. 2再次按AV键选择“细相”(水平相),调整音量并减去键,以便峰值出现在行中心附近的垂直线的列上。 3按AV键选择“测试阶段”,调整音量加和减去键以使光标出现在峰值上。将h#4/v#4的GV罚款值恢复为“ 0”。 (目的是确定在收敛和调试期间,调光器点或线相邻的四条线或点是否位于水平和垂直方向中
23.图形分为64个小网格。只要调试64点,其他部分中的点或线就会相应地调整)。因此,此调整决定了调整影响的范围。 (II) Finely adjust the starting line setting of convergence (setting of start lines) 1 In the green square state, press the av key to select "start lines", and then press the "Volume Up and Subtraction" key to h#4/v#4 (when the cursor packet first slides down the center line of the field at the position when it first enters the convergence state) so that the gv peak is displayed in the center of the field. (注意:“启动线”的值只能是奇怪的)2在H#4/V#4时将GH峰恢复为“ 0”。 (3)按AV键选择“ COAR相”(调整屏幕边缘收敛的线性),然后按“音量向上和减法”键将其设置为“ 1820”。 (iv)按AV键选择“ V1start”,然后按“音量”
24。添加并减去键将其设置为“ 1”。 (v)设置“计数”的值。按AV键,当出现“计数”时,按“音量向上”,以使其值精确显示颜色电视推荐为PAL分离行为52,NTSC分离行为62,PAL ONE ONE ONE 26,NTSC ONE BOTE 3;该值的推荐值:PAL,NTSC和VGA设置为“ 31”。注意:按AV键时,屏幕上显示的值是:item palntscv1启动11V1计数3030 start line745 -fine phase207208coar epeas depy181818hdf phase444test phase6869SET up up(拨打光标速度,在调试某个位置时,调整一个变化和裂纹,应调整Cursor Speed Valice smill spys small shat sate to shim sate to shys spare Atset inset shat sate toseor Speed Aett)89 89
25。注意:当PAL显示为“ 5”时,当NTSC显示为“ 6”时。 4。在融合和罚金调整过程中,应首先调整绿色融合测试网格,然后将红色和蓝色收敛的网格和绿色网格分别调试。对于由彩色电视位置变化引起的本地局部收敛,无需进行粗略的调整,只需进行精细的调整即可。如果精细的调整效果不理想,则还可以输入粗调节模式并调整绿色,红色和蓝色收敛网格线。只有当收敛严重失真时,才需要粗略的调整。在收敛和调试之前,您必须了解远程控制功能功能的功能按钮,然后在收敛状态下执行收敛性调试。该过程不会麻烦。如果您已经调整了Changhong 51PT28A后投影颜色电视,那么要调试精美的显示或精细显示王的融合并不难,因为精美的显示系列仍然使用先锋收敛电路,但是两个遥控器模型的按钮是不同的。 1。绿色收敛的粗略调整应为收敛性
26。只有在发生严重失真时,才需要进行粗略调整。 In the convergence debugging state, press the display key to switch the convergence grid into a green grid, press the "Image Mode Switch" key, select "5 dcrh" (coarse adjustment state), repeatedly press the channel to add and subtract keys (p/), select "dcgh", and adjust the convergence of the green grid in the following order: l Adjust the green row inclination (kgh3) l Adjust the green row pillow distortion (kgh1) l调整绿排宽度(KGH2)L绿色场枕头失真(kgv2)l彩场钥匙岩失真(kgv1)l绿色场倾斜度(kgv3)该部分等同于调整绿色收敛网格图片的几何变形。 2。按图像模式开关键,以使“罚款”显示。按“主和子屏幕尺寸”键将光标切换为绿色。按“数字开关”键分别选择点或行
27。调整。选择点调整时,屏幕上显示“ P移动”。按下通道和量增加或减小键,以将光标移至需要调试的点,然后按“静音”键锁定光标。此时,屏幕显示为“ P锁”(点锁定),然后按静音键在屏幕上显示“ P移动”(点移动)。然后将点移至需要调试的点,直到屏幕上的网格线直接直接和垂直。如果选择行调整,则“行移动”将显示在屏幕上。将线路移至需要调试的地方,然后按“静音”键锁定光标。当屏幕显示“线路锁”时,它表明锁定光标处的线被调试。此时,按“音量上升和减法”键,然后按“通道向上和减法”键,以分别调整左侧,右,上下的线的良好调整数据。如果在屏幕上调整了数据感到满足,请连接遥控器的“菜单”按钮以存储数据。此时
28。“数据保存确定”将显示在屏幕上。否则,请勿按菜单键,直接按返回键退出收敛状态,或关闭遥控器,或者按屏幕站键退出“ S”模式。注意:l在罚款过程中,光标将自动更改为三种颜色;调整了一定数量后,按静音键,光标将返回到原始颜色l。 A better method for fine adjustment points is to adjust from the center to the surroundings according to the shape of the swirl. In other words, first adjust the h#4/v#4 in the center of the screen, then adjust the eight points around it, and so on. l If the fine adjustment error of the adjacent unadjusted point is increased when adjusting a certain point, the point should be adjusted so that the error of the adjacent unadjusted point is within the allowable range. Otherwise, the data of this adjacent point may be adjusted to the maximum value and does not meet the requirements. l The adjusted data can be displayed as "data save ok" by pressing the menu key, etc.
29. When the data is stored. l When adjusting the green rough adjustment parameters, the convergence of the other two guns will be mobilized at the same time. 3. Adjustment of red convergence. In the converging state, press the "Show key" to switch to the square screen with red and green colors. Press the picture in picture key to switch the cursor to the red l red static convergence adjustment, and adjust the coarse convergence "dcrh" and "dcrv" to make the red and green lines and field centers overlap. l Adjust the red row inclination (krh2) l Adjust the red row linearity (krh1) l Adjust the red row width (krh3) l The whole red field keystone correction (krv1) l Adjust the red field inclination (krv2) l Adjust the red data fine adjustment (the method is the same as green), so that the screen square is yellow. 4. Adjustment of blue convergence In the convergence adjustment state, press the display key to make the screen red and blue squares appear. Press the picture-in-picture key to switch the cursor to blue. l blue
30. Adjust the color and quiet convergence, press the image key to the image key until "dcrh" appears, press the channel addition and subtraction key to select "dcbh" and "dcbv", and press the volume addition and subtraction key to make the blue convergence row and field center located in the center of the screen respectively. l Adjust the blue row inclination (kbh2) l Adjust the blue row linearity (kbh1) l Adjust the blue row width (kbh3) l Adjust the blue field keystone correction (kbv1) l Adjust the blue field inclination (kbv2) (the method is the same as green and red debugging) 5 The red and blue convergence fine adjustment method is the same as the green convergence fine adjustment. Note: When selecting "dcrh" (coarse adjustment mode) by pressing the image mode switch key, press the channel addition and subtraction key repeatedly, and 26 coarse adjustment parameters will be displayed on the screen: 5 dcrh3015kgv20635krrh14455kgv30135krh20045krh30575dcbh3015krh4
31。 0065kbh14385krv12635kbh20225krv20295kbh30085kbh41155dcgh0055dcbv0035k gh10465kbv12855kgh21125kbv20065kgh30095dcgv0375kdf10015kgv10015kdf2506 5. Storage and copying 1. Press the menu key to store the debugged data. After storage, the screen displays "data save ok" to indicate that the data has been saved. 2. Press the Liyin key to copy the adjustment data to the corresponding mode of DVD (at this time, there is no need to converge and debug the DVDPal or DVDntsc signal, and use the copy function to achieve converge and adjustment under DVD). After the copy is completed, the screen displays "data save ok" 6. Convergence in other modes
32. Adjust the convergence adjustment method of other modes of fine display rear projection is the same as the above method (there are 8 formats that need to be adjusted, so please do not move the parameters in the maintenance state). When adjusting the Pal50 progressive scan mode, receive the Pal system signal in the TV mode and set the frequency doubling mode to progressive scan. When ntsc120 anti-line flicker mode is adjusted, receive and receive ntsc in tv mode, and set the frequency doubling mode to anti-line flicker or motion compensation. The rear projection of the fine display king must be adjusted under NTSC system and VGA signal. The difference between Fine Display and Fine Display is that the frequency conversion circuit is different. The Fine Display rear projection frequency conversion circuit is in the 100hz interlaced scanning format, the Fine Display rear projection is in the 60hz progressive scanning format, and the line scanning line between the two is 1250. Except for the different circuits in this part, the other circuits are basically the same. The above introduces the convergence adjustment methods of two representative models of Changhong. Now how to remove 51pt28a
33. A brief introduction to the projection tube and other processes. 1. Schematic diagram of the front and back of the rear projection TV: See Figure (1) (2). 1. Schematic diagram of 51pt28a TV (2) 51pt28a TV rear cover 2. Method of taking the projection screen: 1. Remove the front and rear frame of the projection screen: 1. Remove the front and rear frame of the projection screen 2. Remove the back cover studs of the projection screen and take the back cover. Because there is a reflective screen on the rear cover and it is heavier, to avoid damaging the projection screen, please carefully take the rear cover and protect the mirror of the reflective screen; 3. Take the front cover. Hold both ends and force it outwards to remove it. Note: There are two fixed cards on the back of the cover plate, do not break the fixed card. Remove the cover and you can see four nails on the chassis. Then remove the nails to remove the display.
34. Screen display. Note: When removing or installing the display screen, it is best to have a person holding the display screen to avoid damage from falling directly and falling. 3. Method for taking the projection tube: 1. Remove the projection screen first. At this time, three projection tubes can be seen (three projection tubes from left to right are red, green and blue respectively). You can also see the projection tube deflecting the fixed nails, magnetic rings and projection lenses. 2. Looking downward to the projection tube, you can see the nails with fixed lenses, physical focus knobs, and then you can find the nails with two nails with fixed projection tubes on the iron bracket. Remove the two nails (Note: Do not use the nails with fixed lenses as nails with fixed projection tubes, and you cannot touch the surface of the lens with your hands. When there is stain on the surface of the lens or the reflecting screen, please use silk cloth to gently wipe it, instead of using toilet paper, fiber cloth, etc. to avoid scratching and contaminating the projection mirror and reflecting mirror). 3. Then look inward at the back of the chassis and see two large pieces of fixed projection iron bracket plates, just take down one
35. Block fixed projection tube iron bracket. Note that when taking this bracket, you need to hold it with one hand to prevent the iron block from falling and damaging the projection tube. Care is also required during installation. 4. From the front of the chassis, carefully unplug the video amplification board from the projector. 5. Remove the high-voltage lead from the row output transformer. Because there is a connection cap between the high voltage line and the line output, and the two are connected in a bayonet manner. Therefore, if you remove or install the high-voltage wire, you must connect this cap. At the same time, the high-voltage wire core wire cannot be bent when inserted into the line output hole to prevent fire jumping and screen wire drawing interference strips appear. 6. Unplug the deflection socket and then take out the projection tube to be removed from the front. 4. To change the projection tube 1, you need to use a projection tube of the same model, and evenly apply silicone around the high-pressure cap, and gently press the high-pressure cap (to prevent gaps from causing high-pressure leakage and causing ignition), and then install the collecting coil, deflection coil, magnetic ring, etc. in sequence. 2. Fix the projection tube nails on the fixed projection tube and connect the high-voltage cap leads. 3. Turn on the computer
36. Convergence and debugging. Fault example: The boot screen is normal, and the four-corner gratings are stretched and contracted for a period of time (the picture is unstable) Analysis and maintenance: There is a picture on the screen, indicating that the bus control signal and image channel circuit output by the CPU are working normally. After working for a period of time, the four-corner gratings are stretched and contracted for a period of time. It is suspected that the bus is disturbed during the transmission process, or the component thermal stability failure occurs in the row, field scanning circuit and converging component circuit. In order to determine the fault location, the assembly will be unplugged and the convergence coil will stop working. At this time, the grating on the screen is still unstable. It is suspected that the fault is related to abnormal bus control or abnormal working of the row and field scanning circuit. Use an oscilloscope to measure the CPU output bus waveforms respectively. There is no interference pulse signal on the SCL and SDA bus waveforms, which shows that the machine's fault has nothing to do with the bus control signal, and the fault may occur on the row and field scanning circuits. tda8844 (40
The waveforms of the pins of 37,), (46), and (47) are unstable. In order to determine whether the faulty part is in the row field output stage or the row field excitation stage, the row push pipe v432 is disconnected, and then the (40) (46) (47) pin waveform is measured. At this time, the triple-pin waveform is restored to normal, indicating that the row field excitation pulse formation circuit is working normally. It is suspected that the fault occurs on the row output stage circuit. Once again, the fault phenomenon of this machine can cause unstable row and field amplitude may be on the high-voltage detection circuit connected to the tda8844 (50) pin. Monitor the voltage of the "b" pole of v438 and found that the voltage of the pin has a stable voltage of 1.7v when the start-up image is stable. When the grating is unstable, it is measured that the voltage of the pin changes between 1.7v2.1v. However, the DC voltage generated by the rectification filter of vd443 and c483 is very stable (about 33v). It is suspected that the voltage of the v438 "b" pole is unstable and v438 and vd43.
38 and 9 are related to poor performance. Replace v438 and vd439, watch after a long time of booting, the grating is stable, and the fault has been eliminated. The second part: Changhong various types of color TV maintenance data debugging. Since Changhong Electric Co., Ltd. was the first to launch the NC3 movement series digital high-definition color TV produced with i2c bus technology in the early 1990s, it has successively launched high-end digital color TVs such as cn5, nc6, nc-7, ch8, cn9, ch10, cn12, dt1, and tda produced with i2c bus technology. Different movement chips (cpus) are different, and the maintenance service mode and debugging methods are also different. Now, the products produced by Changhong's various movements are normally working, and the data parameters in the maintenance mode are called up, and the chip classification is given: the method of entering the maintenance state, how to debug and exit the maintenance state. The first movement Changhong NC3 movement bus data debugging Changhong NC3 movement (cpu) is divided into four categories:
39. It is a product of c2919p, c2919ps, c2939ks, c3428ps and other models produced by tmp47c1638au353. The second is the series of products such as c2919pv, c2939kv, c3418pn, etc. produced in tmp47c1638au357. Third, c2919pk, c2939ke, c2929ae, c3418pb, c3418kv and other products produced in tmp47c1638au381. 四是以tmp87cm36 (ch08001) 生产的c2920pn、c2919pd、c3419pd、c2919pn、c2920pn、c3419d、特制c3419pd、c3419pn、c3419pd/pb/pt等系列产品。由于nc3机芯芯片不同,故总线调试
40、方法不一样。该机芯进入数据调试方法依芯片分,有两种完全不一样的总线数据调试方法。第一种以第一、二、三类芯片生产的产品进入维修状态的方法相同,总线数据调试为:1、进入维修“m”状态方法:(1) 先按住遥控器上的“f”键和“tv/av”转换键(注意按“f”键时,要尽量向右边按,或者将遥控器内“f”按键处的外边印制板接触点用胶布沾住)。(2) 松开“f”和“tv/av”接键,再逐步按遥控器上数字键“1”.“0”.“4”. “8”四个键。若操作得当,此时屏幕上“1、0、4、8”几个字符将由绿色变成红色,最终在屏幕上显示绿色字符“m”。若操作不当,此时“1、0、4、8”四个字符不变色,且在频道转换间变化
41、。2、参数调整方法: 出现“m”字符后,按遥控器上“f”和“节目菜单键”(图象调整键),或按“f”键和“声音调整键”此时屏幕上将出现“m00、m01、m02. ”等参数,见表(1)。改变各参数的大小,按“音量增/减”键。 3、退出维修状态方法:用遥控关机,电视机则自动退出“m”调试状态。第二种以第四类芯片tmp87cm36 (ch08001)生产的产品进入维修状态方法与第一种不一样,该芯片生产的产品不能用第一种方法进行总线调试。该芯片生产产品有两种方法:1、总线调试方法:(1).进入和退出维修状态方法:采用c2920pn机型遥控器(型号为k4j)。将遥控器k4j上的二极管v12断开,按遥控器上
42、的“调谐键”进入或退出维修“m”状态。(2). 调整各参数方法:利用“节目增/减键”调出各参数,见表(1)。节目“增”键为向前调,节目“减键”为向后调各参数。利用音量“增/减”键改变各参数的大小。2、总线调试方法:(1).进入维修状态方法:用遥控器k7a,按遥控器菜单选择键旁“项目选择”键,屏幕上显示绿色字符“m”,表示已进入维修总线调试状态。(2).数据调整方法:按“f”键和“图象调整”键或“f”和“音质调整”键进行翻项,按音量“增/减”键调整参数大小。(3).退出维修状态: 遥控关机,退出维修“m”状态。表(1) nc3 机芯总线数据表名称内容c2939ksc2919pc2920pn/c2
43、919pdc2919psc2919pvc3419c3419pn/pdc3418pk/c2919pkc3419pn/pdc3419ptc3419pbc3418pbc3419dm00模式0032486148506350546161635445m01模式01595757595895759595757575957m02模式0227275927276327315963592743sub副亮度31314131315427344848483441sbm副亮度变化范围28283528283228284444442835scn副对比度32323232324032324040403232scx副对比度最大6363
44、6363636363636363636363scm副对比度最小101010101081010888108scl副彩色4.43mhz35353235353229293232322932sc3副彩色3.58mhz33333233333233333232323232st1副色调38383838383838383838383838ss4副锐度4.43mhz34343434343434343434343834ss3副锐度3.58mhz34343434343434343434343434hps行中心42423442424840403434344134hit帧幅32323132324836364848484
45、048lin帧线性31313231313234333232323332vsc帧s校正22222222222828322828283228vps帧中心32324032323810103838382138vcp帧补偿32323232323232323232323232wid行幅20202520202525252525252625dpc东西校正38383938382222222222222122cnr边沿校正22221222224535354545453545key梯形校正16161516161514141515151415hcp行补偿00000000000000000000000000vmc帧s校
46、正32323232324132324141413241sv4副锐度av 4.43m34343434343434343434343434sv3副锐度av3.58m27272727272727272727272727phppip位置05050705050605050707070507注:1.表(1)中有“”符号的项因不同的crt,该参数需根据具体情况调试该项参数。2.表(1)中m00、m01、m02参数含义,在表(2)中列举了各参数数据与机型功能的关系。表(2)二进制十进制调谐器选择图象选择伴音选择模式m00 模式01模式02代码功能代码功能代码功能a011a0uhf波段开关只有uhf
47、波段a0视频端子开关有视频输入a0环绕声开关有环绕声00有vhfuhf波段无视频输入无环绕声a112a1增补开关4波段(有增补功能)a1 av端子路数两路视频输入(av1、av2)a1厅堂环绕声有厅堂环绕声003波段(无增补功能)一路视频输入(av)无厅堂环绕声a214a2制式彩色多制式切换(tv)a2a2德国双伴音有德国双伴音00单制式(pal tv)无德国双伴音a318a3a3色调控制功能开关有色调控制功能a3重低音有重低音00无色调控制功能无重低音a4116a4画中画开关有画中画显示a4数字梳状滤波器开关有数字梳状滤波器a4卡拉ok功能开关有卡拉ok00无画中画显示关闭数字梳状无卡拉ok
48、a5132a5双调谐器设置有双调谐器a5广告语开关有广告语a500只有一个调谐器无广告语第二种机芯长虹cn-5机芯总线调整长虹cn-5机芯cpu芯片分三种,它们分别是:ch06001(mn1871274)芯片生产的n2918、c2588d、n2516等机型。以cht0601生产的r2118n、2131fn、r2116n、2132fn等机型。是以cht0605片生产的r2518n、r2519n、r2916n、r2918n、2516fn、r2516fn、r2518fn、2518fn、2519fn、2916fn、2918fn等机型。这两种芯片ch06001、cht0605虽不一样,但两种芯片生产
49、的产品进入维修状态方法相同。另一种cht0601进入维修状态与前三种芯片有一点区别,该芯片不能通过cpu(9)脚对地短路进入,只能通过cpu(36)脚瞬间对地短路才能进入。cn5机芯进入维修状态方法:1进入维修状态的方法:将cpu(36)脚瞬间对地短路或将cpu(9)脚对地短路(cht0601不能用此脚),屏幕上显示红色字符“s”,即表进入“s”维修模式状态。2 数据调整方法:(1).在维修模式下,反复按压遥控器上“日历键”,对屏幕上参数进行翻项;(2).按遥控器上音量“增/减”键,对参数大小进行调整。见表(3)。(3).在“s”模式状态下,按遥控器上“背景”控制键,此时屏幕显示一排数据,即模
50、式1或模式2 ,反复按“背景”键,将在模式1、2间转换,按音量“增/减”键对模式参数进行改变。见表(4)。3.退出维修模式“s”,遥控关机或按“定时关机”键,并断开cpu(9)脚短接线。cn5机芯数据调试还有此特点,若进入维修状态数据调乱或更换存储器后,不知各参数数据大小,接收tv信号无法正常工作,此时可将存储在cpu中的部分参数通过拷贝方法,将部分参数拷贝到调乱或新更换存储器中,而不用一项一项地调整各种参数,电视机就能正常工作了,模式1、模式2不能通过拷貝,须用遥控器设置。(注拷贝只针对25”彩电,21”彩电不能用此法。拷贝后,交与用户前还需细调各参数,如白平衡等)。 数据拷贝方法:(1).
51、将cpu(9)脚接地,关掉总电源开关。(2).同时按住电视机上节目“增”键(pos+)和菜单键(menu),再接通电源开关,即可实现efprom的初始化,即拷贝。 表(3)(以n2918调好为例)n29182118fnr2518n显示内容数据数据数据preset模式127c107preset模式2470403rcut off红截止80ac85gcut off绿截止80ab93bcut off蓝截止80b271drive r红驱动404452drive b蓝驱动406134aftofs自动频率控制504242agcdel自动增益控制150a03vifvco压控振荡器302f31vidadj图象检
52、波输出020504horcen行中心030705subbrt副亮度设置3f 表(4) cn5各机型功能预置表显示项目n29182916fn2518fn25n16、29n16、25n1829n18、25n192919fnpreset1模式12707070424preset2模式24747030347 第三种机芯长虹nc-6机芯总线调试长虹nc6机芯采用芯片只有一种,该芯片型号为tmp87cp38n。以该芯片生产的产品有g2966、g2966a、g2966b、g2966c、g2967、g2967a、g2967b、pf29g88、pf34g8、g3898、pf34g8金香槟、g3898铱金、g29
53、67a铱金等系列产品。总线数据调乱参照表(5)重新调试各参数,电视机工作可恢复正常。若总线调乱,还可通过拷贝,将cpu中存贮的数据调到存贮器,电视机工作后,再对部分参数作细致调试。一、nc6总线数据调试方法:1.进入维修“s”状态的方法:(1).按遥控器k7a/k7b“静音键”一次,(2).再按遥控器“静音键”不放,同时按本机上“菜单键”(menu),(3).屏幕左上角出现红色字符“s”,表示进入维修“s”状态。2.在“s”状态下,数据参数调整方法:a.按本机菜单键(menu),即进入项目显示状态,如出现:r cut、bcut.b.按遥控器节目“增/减”键进行翻页,按音量“增/减”键对节目参数
54、量调整。见表(5)。3.退出维修状态方法:遥控关机。二、nc6机芯总线拷贝方法:拷贝即初始化。它的作用是针对更换存储器后,或数据调乱情况下,可将存储在cpu中的固化参数值拷贝到新装存储器中。 拷贝方法是: a.开机后,进入“s”维修状态; b.同时按住电视机上的“频道增键”(pro+)和遥控器上的“字符显示键”即可对qa02进行初始化,避免新更换存储器qa02后,一项一项地调整参数。三、测试信号-test调出方法: a.进入维修“s”状态b.立即按“tv/av”键,即可调出test_测试信号。需要说明的是进入维修状态后,不能按其它键,再去按av/tv转换键,否则调不出测试信号。 c.对测试信号
55、进行选项,每按一次“av/tv”键,测试信号变换一次。 表(5)(列出具有代表的机型为例) 名称内容g2966pf29g88ag3898固化在cpu中参数1rcut红截止4bh43h43h40h2gcut绿截止45h59h59h40h3bcut蓝截止44h53h54h40h4gdrv绿驱动35h3fhj33h40h5bdrv蓝驱动2dh3fh33h40h6cntx副对比度7fh7fh7fh7fh7brtc副亮度中心83h7dh87h7fh8colcntsc制彩色中心50h50h50h50h9tntc副色调中心50h3bh3bh3bh10colppal副色调中心35h38h3ch38h11colssecam副色调中心2fh2fh2fh12scol副彩色67h71h67h67h13scnt副对比度6ch6ch6ch6ch14rgbbrgb亮度29h20h1bh20h15volsscart音量75h75h75h75h16fvolfm音量预定标15h15h15h15h17nvol丽音音量预定标3ah49h48h3ah18nicl丽音阀值低电平03h03h03h03h19