Question about IBM (09N5424) Motherboard

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CRC Problem What is the meaning of Error code- CRC 0175 in the IBM notebook T20/T23/T21 series ?

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  • Anonymous Apr 20, 2009

    IBM T20 laptop : - error CRC 0175 Eeprom checksum error has occurred during POST.

    BIOS or boot media selection can't be entry although F1 or F12 is pressed during boot respectively.

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2 Answers

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  • Master
  • 395 Answers

Try these:
1.unplug AC,battery,HHD and DVD-ROM
2.press power button,last more than 10 seconds
3.plug battery and AC power
4.power on
5.when see the IBM logo,press F1 button immediately.

If see the error message again,try again!

or bad systemboard

http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-4K2MCU

Posted on Jan 03, 2009

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  • Master
  • 818 Answers

Chances are since the system CRC1'd it has a very old BIOS revision. From version 1.10 on, the CRC issue has been fixed. So, get the latest BIOS from IBM, T21 BIOS: ftp://ftp.software.ibm.com/pc/pccbbs/mobiles/spsdkz34.exe and flash the BIOS. Reboot the system and verify the updated BIOS. Now power down the system, desolder the known good EEPROM and resolder the CRC1 EEPROM. Boot the machine and hit ESC when the splash screen comes up and watch the post screen. The new BIOS should have recalculated the EEPROM checksum and written the changes to it. You'll know if it worked because the CRC1 error will be gone.

Posted on Jan 03, 2009

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1 Answer

Need info about series


The type of drive is IDE and 2.5- Inch for all those models.

T20, T21, T22, T23 --- 2647 all use the same IDE type of drive.

These you can buy for example in ebay. Search for laptop hdd ide 2.5inch or similar.

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IBM ThinkPad T20 0175 : Bad CRC1, stop POST task


> CRC

Cyclic Redundancy Check

When you write a block of data to the disk-drive, a 'CRC' value is calculated, based on the data, and both the 'data' and the 'CRC' are written to the disk-drive. When you ask to read that 'data', both the 'data' and the 'CRC' are read. The 'CRC' is recalculated, based on the data actually read. The "new" CRC is checked against the "old" CRC. If there is a mismatch, you have a 'CRC check' event, implying that the data you wrote could *NOT* be accurately retrieved.

So, it's probable that your disk-drive is "dying" -- it cannot accurately store your data. Replace it.

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CANNOT START BOOT GIVING EROR CODE 0175


This error seems to represent motherboard problems and most likely requires new motherboard. Unfortunately most laptops that are a few years old arent worth fixing, unless you can do it yourself. Try to find a used model same as yours for parts.
Good luck!

Char S.

May 21, 2009 | IBM ThinkPad T20 2647 Notebook

1 Answer

Error 0175 on boot IBM Thinkpad T20


Error code Symptom or error Field replaceable unit or action, in sequence 0175 Bad CRC1, stop POST task. The EEPROM checksum is not correct. System board

Mar 27, 2009 | IBM ThinkPad T20 2647 Notebook

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What is the meaning of error code - CRC 0175 on the notebook IBM Thnigpad T23/ T20/ T21 ?


http://www-307.ibm.com/pc/support/site.wss/MIGR-4PEN8X.html.POSSIBLE EPROM FAILURE CONTACT IBM FOR REPLACEMENT.RICHARDM69

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2 Answers

Error 0175: Bad CRC1, stop POST task


crc (cyclic redundancy check) error can be fixed. the check sum on the chip has been corrupted. the content of the eeprom must re-written back to the chip after correction. for more info, check this:
www.password-removal.com


good luck and regards

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Go on tis forum and post your problem. There is also the Lenovo forum. I have a T23 and haven't seen this error before. These Forums are very good for information on your laptop.

http://forum.thinkpads.com/viewforum.php?f=28

http://forums.lenovo.com/lnv/board?board.id=T_Series_Thinkpads

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1 Answer

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I've seen several T20 series with the same problem. A CRC error pertains to a chipset on the motherboard, and the only way I've found to fix a CRC error is to replace the motherboard.

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Here is the link to the ftp: location for the maintenance manual:
ftp://ftp.software.ibm.com/pc/pccbbs/mobiles_pdf/62p9631.pdf

This applies to IBM ThinkPad T20, T21, T22, and T23 series machines.

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3 Answers

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You can try replacing theCMOS battery. This may work. Afterward set the bios to default. Please let me know how you make otu.

Jan 16, 2008 | IBM ThinkPad T20 2647 Notebook

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