Symptom-to-FRU  index 
The  symptom-to-FRU  index  in  this  section  lists  symptoms 
and  errors  and  their  possible  causes.  The  most  likely 
cause  is  listed  first,  in  boldface  type. 
Note:  Do  the  FRU  replacement  or  other  actions  in  the 
sequence  shown  in  the  column  headed  “FRU  or 
action,  in  sequence.”  If  replacing  a  FRU  does  not 
solve  the  problem,  put  the  original  part  back  in  the 
computer.  Do  not  replace  a  nondefective  FRU. 
This  index  can  also  help  you  determine,  during  regular 
servicing,  what  FRUs  are  likely  to  need  to  be  replaced 
next. 
A  numeric  error  is  displayed  for  each  error  detected  in 
POST  or  system  operation.  In  the  displays,  n  can  be  any 
number. 
If  no  numeric  code  is  displayed,  check  the  narrative 
descriptions  of  symptoms.  If  the  symptom  is  not  described 
there,  go  to  “Intermittent  problems”  on  page  70. 
 
 
Note 
For  an  IBM  device  not  supported  by  diagnostic 
codes  in  the  ThinkPad  notebook  computers,  see  the 
manual  for  that  device.
Numeric  error  codes 
 
Symptom  or  error  FRU  or  action,  in  sequence 
0175
Bad
  CRC1,  stop  POST 
task—EEPROM  CRC1  is  not 
correct  (block  #6) 
System  board
Replace
  planar.(System  halt) 
0176
System
  Security—The  system 
has  been  tampered  with. 
1.  Run  IBM  BIOS  Setup 
Utility,  and  then  save 
current  setting  by 
pressing  F10. 
2.  System  board. 
0177
Bad
  SVP  data,  stop  POST 
task—Checksum  of  the 
supervisor  password  in  the 
EEPROM  is  not  correct. 
System  board
 
(continued) 
Symptom-to-FRU  index 
ThinkPad  X40  59