一、维修故障：

   1.黑屏、无法启动，面板无显示，开机不显示等故障维修。

    2.西门子PCU50开机不显示，有时候能启动，有时候不能启动维修。
二、西门子PCU50主机维修型号：
6FC5210-0DA21-1AA0 MMC103/32MB 6FC5210-0DA21-1AA0 840D 
6FC5210-0DA21-1AA2 MMC 103, 64MB 6FC5210-0DA21-1AA2 840D 
6FC5210-0DA21-2AA0 MMC 103 / 32MB 6FC5210-0DA21-2AA0 840D 
6FC5210-0DA21-2AA1 MMC 103, 64MB 6FC5210-0DA21-2AA1 840D 
6FC5210-0DA21-2AA2 MMC 103, 64MB 6FC5210-0DA21-2AA2 840D 
6FC5210-0DB21-3AA1 MMC103,64MB/NT 6FC5210-0DB21-3AA1 840D 
6FC5210-0DB22-3AA1 MMC103 / 128MB / NT 6FC5210-0DB22-3AA1 
6FC5210-0DF00-0AA0 PCU 20, 166MHZ/16MB 6FC5210-0DF00-0AA0 
6FC5210-0DF00-0AA1 PCU20 SPC 166MHZ/32MB 6FC5210-0DF00-0AA1 
6FC5210-0DF00-0AA2 PCU20 SPC 266MHZ/32MB 6FC5210-0DF00-0AA2 
6FC5210-0DF00-1AA0 PCU 20, 233MHZ/32MB 6FC5210-0DF00-1AA0 
6FC5210-0DF00-1AA1 PCU20 SPC 233MHZ/32MB 6FC5210-0DF00-1AA1 
6FC5210-0DF00-1AA2 PCU20 SPC 333MHZ/32MB 6FC5210-0DF00-1AA2 
6FC5210-0DF01-0AA0 PCU50 O.HMI 6FC5210-0DF01-0AA0 810D/840D 
6FC5210-0DF02-0AA0 PCU 50, HMI 6FC5210-0DF02-0AA0 810D/840D 
6FC5210-0DF03-0AA0 PCU 50 6FC5210-0DF03-0AA0 810D/840D 
6FC5210-0DF04-0AA0 PCU 70, WIN 6FC5210-0DF04-0AA0 
6FC5210-0DF05-0AA0 PCU 50, WIN 6FC5210-0DF05-0AA0 810D/840D 
6FC5210-0DF20-0AA0 PCU 50 566MHZ, NT4.0 6FC5210-0DF20-0AA0 
6FC5210-0DF21-0AA0 PCU 50 566MHZ, NT4.0 6FC5210-0DF21-0AA0 
6FC5210-0DF21-2AA0 PCU 50 566MHZ, WIN XP 6FC5210-0DF21-2AA0 
6FC5210-0DF22-0AA0 PCU 50 1,2GHZ, NT4.0 6FC5210-0DF22-0AA0 
6FC5210-0DF22-1AA0 PCU50 1,2GHZ, WIN2000 6FC5210-0DF22-1AA0 
6FC5210-0DF22-2AA0 PCU50 1,2GHZ, WIN XP 6FC5210-0DF22-2AA0 
6FC5210-0DF23-2AA0 PCU 50 566MHZ, WIN XP 6FC5210-0DF23-2AA0 
6FC5210-0DF24-0AA0 PCU70 1,2GHZ, WIN NT 6FC5210-0DF24-0AA0 
6FC5210-0DF24-2AA0 PCU70 1,2GHZ, WIN XP 6FC5210-0DF24-2AA0 
6FC5210-0DF25-2AA0 PCU50 1,2GHZ, WIN XP 6FC5210-0DF25-2AA0 
6FC5210-0DF31-2AA0 PCU50.3-C, WINXP 6FC5210-0DF31-2AA0 
6FC5210-0DF33-2AA0 PCU50.3-P, WINXP 6FC5210-0DF33-2AA0