Products > Test Equipment

TDS540 not booting, "Flashrom header failed"

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chronos42:

--- Quote from: masterx81 on May 12, 2020, 05:59:46 am ---Hi! I see if i can get the other tds540 cheap and i'll let you know!
What you mean for TDS500 firmware?  If i've well unterstood 520 and 540 fw are different.
Thanks!

--- End quote ---
Sorry, that was a typing error, I meant TDS 540 of course.

hansgt21:
Hi,
I recently picked up the hobby of ( trying to ) repairing old test equipment and got a TDS540.
I have been trying to get it to boot up but it is stuck with a flashrom checksum error.
It seems somehow the firmware got compromised.
All caps have been replaced and the boards ( A10, A11, display ) look good with no apparent visual damage.
NVRAM has been replaced with a preprogrammed version from kellyjo_13 / ebay.
After reading to multiple posts on different forums I guess I am more confused than before...
My questions are :
Where can I download a working firmware version for my  TDS540 ?
How to update the FW ( in Windows ? ,  DOS ? )
Which ( if any ) GPIB to USB converter would work or do I need an old 488.2 card ?

The boot message looks as follows :
        Enabling Bus Control register. Value = 0x67
        IMR 1 Register test passed.
        Misc. Register test passed.
        Timer Interrupt test (Auto-Vector) passed.
        NVRam DSACK test passed.
        NVRam Write protected.
        Flashrom DSACK and JumpCode test passed.
        Invalid Flashrom Header checksum = 0x3efc, should be 0xfefb
        Flashrom Checksum test failed.
       Cannot transfer control to Flashrom.
       Transferring control to the SDM (monitor).

Any help is very much appreciated.

Hans

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