Dear broken TDS8000 owners,
I have to say, I was reading the eevblog posts over years, and really here and there get very good advice or hints.
I have been repairing test equipment for mmm say more than 20 years now profesionally, but not for much profit, more for fun.
Since my main job is the design of radar and test equipment. But dont want to talk long here.
Here I want to give something back to the forum.
TDS8000 mostly suffer from flash corruption in the Xilinx 95xxx CPLDs. This is probably through the excessive heat on the motherboard in combination of time.
So errors look different on each scope, as bits may toggle in any of the 10 CPLDs. To find this out I sadly needed to buy 2 scopes
and read out CPLD flash contents. Since some of them have same content, i was able to reconstruct the original content.
On one PCB one CPLD was even dead.
Please find instructions attached. These files allowed me to successfully reapair two mainboards.
Please have fun and share.