DM800HD问题解决.doc

1.启动电压低，硬件问题。2.调谐器是错误的.防止全面启动了。3.SIM卡与抄板机器的软件版本是否适合。4.LM2742构成的1.3V电路（图）是为主芯片BCM7401提供的电源.为了确保供其卫星电视接收机电源的动态稳定性能,在主板卡座的上方两排8只大容量电解电容中有7只（4700F/10V3,2200F/6.3V4）为1.3V电源滤波。5.主板上电源6.AMD29F0407.不插高频头可以启动吗? 高频头问题8.三个晶振频率对吗? 频偏不能超过100K.9.换一下解耦电容100N or 100uf 16V10.只有10% 25V 的 11.在线放大器Try to install a recent cvs image like boxman or ozoon in flash and then install a good image like nabilo or newnigma2 inusb or hdd.You will see that many problem will disappear Thats happen because you have a dm800 clone.Just find out what is the seconstage (69,70 or 72)it suports and put a patched image with the 第一步:将你的DM800hd的所有接口上的线拔掉，注意先拔掉电源线，再拔掉高频头的同轴电缆 。第二步：从路由器接一根直连网线插入DM800hdRJ45口。第三步: 将刷机线，一头插入电脑串口，一头插入DM800hd串口。注意： 此台电脑与路由器也是相连的。第四步: 运行dreamup软件。设置正确的串口 Serial Port设置Local IP（PC）： 填写你的电脑的 IP地址。select one 填写你的电脑的IP地址设置Remote IP (BOx) :填写你的 DM800hd死机之前的IP地址第五步：点击Connect第六步：插入电源线注意：这时候一定要注意等2分钟，否则刷机还将需要10几分钟。 一定要等2分钟。第七步：点 Flash，按照原来的刷机流程刷机即可。特点：你会发现通过这种网线与串口线配合的串口刷机法，速度飞快，大约2分钟即可完成刷机。拆机将卡取出，再用串刷，第一次启动时一定要装好卡。应该可以救的。Replace the secondstage boot loader. There is a bug with newer loaders on SIMs 2.0.1Then install DE for clone (Google the image). Dm800 keeps rebooting or shutting down at startupSpent most of the day yesterday messing around with 5 dm800s, mainly to swap over rev J K tuners with the L3 tuner. What I noticed was that on some of the 800s i changed, the boxes would reboot soon after the boot screen. At first I thought the tuners were not sitting correctly, so I double checked and tried again and same problem.So i thought maybe could be a sim issue and tried 69702.01, same problem. So then i thought could be image problem, tried gemini, dreamelite and PLI, same problem. By now Im thinking ok i got some faulty L3 tuners, So I pulled out my main 800 clone that I had put a L3 tuner in back in May and tested it and tried the tuners, they all boot and work fine. ( more about that at the end).I then went back tried the L3s in the boxes and same thing, constant reboot, so I put the rev J tuner in the boxes and they boot fine, no problem. Weighing up everything I could only come to the conclusion that the mainboard was the problem. So I opend up all 5 boxes and noted all 5 said Revision J on the mainboard. 3 of the 5 boxes would keep rebooting and 2 were fine with the L3. I did note however that the 2 that booted fine had fan pins in different locations to the 3 that didnt. The 2 that booted fine had the fan pin just above the heat sink, where as the 3 I had problems with had the pins by the internal usb slot. I have stuck two photos up of the boards. Hope this is of help. L3GOOD being the board that worked with it.BTW. this L3 tuner rumour that it fixes the Discovery HD glitch seems to be untrue ! Tried at least 6 different houses with various boxes all with the same result, including changing the echo number.A suggestion. try fitting decoupling capacitors across the fan wires. 100N or 100uf 16V . See if that cures the problem. 换一下解耦电容100N or 100uf 16Vwill only work with an inline like this works 100% also need to look at your ecm times KONIG IN-LINE AMPLIFIER In-line amplifier （在线放大器） with slope function 13/18dB. This amplifier can be connected between a satellite dish and a receiver. The LNB switching voltage is used as a supply for the amplifier. - Frequency Range: 950 - 2300 MHz - Gain: 950MHz: 13dB, 2300MHz: 18dB - Max. output: 100dBuV Right the L3 tuner has about 5 revisions latest revisions have major faults, and main board has now changed from rev J in cloned to rev L. the faulty L3 tuners that are not working with in-line amp are from 6/2010 to mid 7/2010 this is direct from ukdreamshop guy so for those buying clones be careful and buy from a reliable source that has tested them with the in-line amp to make sure no problems with hd, ie the guy that told me this info.! Yea he always tests his boxes before despatch because of the problems with the L3 tuners.! and they all need a in-line amp to be perfect. 由于SIM卡的原因，部分DM800机器无法使用secondstage 73及其之上驱动版本的IMG，如Gemini2-430/440、LT Fifth SP8等，如果强行安装，表现出来的现象是机器无法正常启动，或者启动后找不到Tuner，或者不能进入蓝色面板等故障。这时需要IMG中的 secondstage版本更换为较低的版本，如secondstage 72才能正常使用。 首先从网络上下载secondstage 72驱动的压缩包，经过解压缩后有“secondstage-dm800-72.nfi”、“secondstage-dm800-72.ipk”和extra驱动包三个文件，然后按照如下方法更换。 1、Web页面更换 先用网络接口配合Web页面刷写新版本的IMG，刷写完成后继续返回到Web刷机页面，刷写“secondstage-dm800-72.nfi”文件，完成后重新启动机器，就完成了secondstage驱动的更换。 2、DCC-E2更换 如果刷写新版本IMG后就将机器重新启动了，虽然无法进入正常工作状态，但采用DCC0E2软件还是可以和DM800机器通讯的。这时可以从其 TooleIPKG Packages界面下的“Upload package”按钮安装“secondstage-dm800-72.ipk”文件，当显示“#rottdm800”表示安装成功，重新启动机器，安装ipk文件。 3、更换extra驱动包 更换secondstage驱动后，如果机器还是不能正常启动，这时就需要将extra驱动包上传到1ib/modules/2.6.12-5.1brcmstb-dm800文件夹下，替换其同名的文件。这样就突破了早期SIM卡的制约，使用最新版本的IMG了。DM800高清多媒体接收机无法启动的检修方法DM800高清多媒体接收机无法启动的检修方法近年来，随着亚太地区上空几个新卫星免费高清频道的开播，高清晰的画质、动人的伴音吸引了越来越多的高清卫视发烧友。加上国内市场经受了dm500卫星接收机的洗礼后，越来越多的烧友感受到了DREAMBOX机器的可玩性。DM800高清多媒体接收机一经推出，便成了高清烧友们追求和关注的目标。上海卫星电视安装网不过很多使用Dreambox DM800卫星高清接收机的用户发现，机器关机后再开机，在很多情况下会出现不能正常启动的现象，即机器OLED屏无显示，或者是始终显示“Dreambox Multimedia”字符，这就是机器未能正常启动。有些用户认为是随机附带电源适配器功率小了，但换成了大功率的电源适配器后还是不能解决。一些用户认为是仿制机器的问题，而事实上原版机器依旧存在这个问题。通过对DM800电路硬件分析得出结论：这是DM800所采用的电源管理方案所产生的特有现象。DM800采用外置的电源适配器，在电路主板上还需要1.3V、2.6V、3.3V、5V等多路工作电压，这些电压都是由主板上的各个新型的电源管理芯片构成的电路来完成。特别是由LM2742构成的1.3V电路是为主CPU芯片BCM7401提供电源的。为了确保其电源的动态稳定性能，在主板卡座的上方两排8只大容量电解电容中有4只4700F/10V为1.3V主线路电源滤波，另外还有3只2200F/6.3V电解电容为各分支线路上的1.3V电源滤波。在断电时，主芯片电路不能立刻消耗掉这些电容所储的能量，而是需要一个释放电荷的过程。在此期间，如果用户再次打开的话，由于电容两端电压瞬间不能突变的特性，而仍是维持原来电容逐步释放电荷时的电压。因此CPU内部电压检测电路就会立刻侦测出供电的异常性，发出执行指令，启用保护电路工作，从而导致机器死机。实际上这种现象和早期采用的大板电路结构的航科410卫星接收机电源缺陷类似，用过该机的烧友都知道解决方法。对于DM800来讲，只要在断电后45分钟再开机，就能够正常启动了。上海卫星电视安装网针对这个问题，国外烧友也探讨过，除了断电延时开机方法外，还有快速开/关机的方法。就是关机后再立即开机，一次不行，再重复一次，也能得到解决。实际上道理也很简单，快速开/关机时，各个部分的大容量电解电容存储电压还来不及下降，此时再次开机，CPU检测不到电压错误，当然能够正常启动了。Try to install a recent cvs image like boxman or ozoon in flash and then install a good image like nabilo or newnigma2 inusb or hdd.You will see that many problem will disappear Thats happen because you have a dm800 clone.Just find out what is the seconstage (69,70 or 72)it suports and put a patched image with the correct seconstage.regards 第一步:将你的DM800hd的所有接口上的线拔掉，注意先拔掉电源线，再拔掉高频头的同轴电缆 。第二步：从路由器接一根直连网线插入DM800hdRJ45口。第三步: 将刷机线，一头插入电脑串口，一头插入DM800hd串口。注意： 此台电脑与路由器也是相连的。第四步: 运行dreamup软件。设置正确的串口 Serial Port设置Local IP（PC）： 填写你的电脑的 IP地址。select one 填写你的电脑的IP地址设置Remote IP (BOx) :填写你的 DM800hd死机之前的IP地址第五步：点击Connect /url第六步：插入电源线注意：这时候一定要注意等2分钟，否则刷机还将需要10几分钟。 一定要等2分钟。第七步：点 Flash，按照原来的刷机流程刷机即可。特点 ： 你会发现通过这种网线与串口线配合的串口刷机法，速度飞快，大约2分钟即可完成刷机。拆机将卡取出，再用串刷，第一次启动时一定要装好卡。应该可以救的。Replace the secondstage boot loader. There is a bug with newer loaders on SIMs 2.0.1Then install DE for clone (Google the image). Dm800 keeps rebooting or shutting down at startupSpent most of the day yesterday messing around with 5 dm800s, mainly to swap over rev J K tuners with the L3 tuner. What I noticed was that on some of the 800s i changed, the boxes would reboot soon after the boot screen. At first I thought the tuners were not sitting correctly, so I double checked and tried again and same problem.So i thought maybe could be a sim issue and tried 69702.01, same problem. So then i thought could be image problem, tried gemini, dreamelite and PLI, same problem. By now Im thinking ok i got some faulty L3 tuners, So I pulled out my main 800 clone that I had put a L3 tuner in back in May and tested it and tried the tuners, they all boot and work fine. ( more about that at the end).I then went back tried the L3s in the boxes and same thing, constant reboot, so I put the rev J tuner in the boxes and they boot fine, no problem. Weighing up everything I could only come to the conclusion that the mainboard was the problem. So I opend up all 5 boxes and noted all 5 said Revision J on the mainboard. 3 of the 5 boxes would keep rebooting and 2 were fine with the L3. I did note however that the 2 that booted fine had fan pins in different locations to the 3 that didnt. The 2 that booted fine had the fan pin just above the heat sink, where as the 3 I had problems with had the pins by the internal usb slot. I have stuck two photos up of the boards. Hope this is of help. L3GOOD being the board that worked with it.BTW. this L3 tuner rumour that it fixes the Discovery HD glitch seems to be untrue ! Tried at least 6 different houses with various boxes all with the same result, including changing the echo number.Thanks A suggestion. try fitting decoupling capacitors across the fan wires. 100N or 100uf 16V . See if that cures the problem. 换一下解耦电容100N or 100uf 16V will only work with an inline like this works 100% also need to look at your ecm times KONIG IN-LINE AMPLIFIER In-line amplifier （在线放大器） with slope function 13/18dB. This amplifier can be connected between a satellite dish and a receiver. The LNB switching voltage is used as a supply for the amplifier. - Frequency Range: 950 - 2300 MHz - Gain: 950MHz: 13dB, 2300MHz: 18dB - Max. output: 100dBuV _Right the L3 tuner has about 5 revisions latest revisions have major faults, and main board has now changed from rev J in cloned to rev L. the faulty L3 tuners that are not working with in-line amp are from 6/2010 to mid 7/2010 this is direct from ukdreamshop guy so for those buying clones be careful and buy from a reliable source that has tested them with the in-line amp to make sure no problems with hd, ie the guy that told me this info.! Yea he always tests his boxes before despatch because of the problems with the L3 tuners.! and they all need a in-line amp to be perfect. 由于SIM卡的原因，部分DM800机器无法使用secondstage 73及其之上驱动版本的IMG，如Gemini2-430/440、LT Fifth SP8等，如果强行安装，表现出来的现象是机器无法正常启动，或者启动后找不到Tuner，或者不能进入蓝色面板等故障。这时需要IMG中的 secondstage版本更换为较低的版本，如secondstage 72才能正常使用。 首先从网络上下载secondstage 72驱动的压缩包，经过解压缩后有“secondstage-dm800-72.nfi”、“secondstage-dm800-72.ipk”和extra驱动包三个文件，然后按照如下方法更换。 1、Web页面更换 先用网络接口配合Web页面刷写新版本的IMG，刷写完成后继续返回到Web刷机页面，刷写“secondstage-dm800-72.nfi”文件，完成后重新启动机器，就完成了secondstage驱动的更换。 2、DCC-E2更换 如果刷写新版本IMG后就将机器重新启动了，虽然无法进入正常工作状态，但采用DCC0E2软件还是可以和DM800机器通讯的。这时可以从其 TooleIPKG Packages界面下的“Upload package”按钮安装“secondstage-dm800-72.ipk”文件，当显示“#rottdm800”表示安装成功，重新启动机器，安装ipk文件。 3、更换extra驱动包 更换secondstage驱动后，如果机器还是不