Agilent\Keysight 3000x series scope repair. Sharing the experience.

[w1k]

Hi all!
First post here. I have to share my experience repairing Agilent\Keysight 3000x series oscilloscope.
First of all you can watch the repair process on the YouTube.
https://youtu.be/MGPY9JhcEIg
Sometimes I have some measurement stuff to repair and this one is pretty interesting.
The scope has defective channels 3 and 4. Usually it caused by defective acquisition chips, especially if it is about both channels 3 and 4( usually used much less frequently then 1st and 2nd). It is very difficult to replace this Acq chips , because it has a huge metal cooling shields and you need a good pre-heating soldering table or full size BGA soldering station to replace them.
I decided to make it another way. I have another 3000x main board , probably with defective FPGA chip. I received this board with black screen ( cooling fan works) and I thought that it is a NAND memory problem. But re-flashing the firmware didn’t fix the problem , so I decided that it is 70% FPGA or 30% CPU problem.
I had to transfer SPI Flash Loader , FPGA configuration and NAND memory chips to another board with working acqusition part(I wasn’t sure 100% in the repair beginning ).
I was really happy when the scope successfully turned on and self calibrated.
The whole repair process was about ~3hours +- 15 minutes.
I hope you will enjoy this !
Thank you!
PS. Sorry for my eng
PSS. OMG , first video and it is 30 minutes 😊