Electronics > Repair
Agilent 34461A corrupted flash
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analogRF:

--- Quote from: Eng_tech on January 14, 2025, 01:21:33 pm ---When I first did the YModem upload and booted I did have my USB flash drive inserted into the front panel with the firmware on it. The flash drive just flashed it's led like it was being read but the meter's screen stayed white. I left it alone giving it some time and watch the serial terminal for any indication that something was happening. After a while, I just shut off the meter and tried the same process but without the flash drive attached. It booted just like it boots off the NAND.
So, you speak of DLL files. They are not part of nk.nb0 that I uploaded via Ymodem? I'm confused. You think they are loaded in at another location in NAND? You could be correct that the boot process halts from a corrupted DLL. It looks like the process just stops as it is trying to display the blue graphics background. Gets a small part of the way and stops.

--- End quote ---

yes if i understood correctly (others may correct me here) the main wince files are still being read from the nand. the nk.nb0 is just a minimal kernel to boot the device initially. i may be wrong about that but since everything is quite similar to keysight scopes, I believe the main WinCE files are loaded after your last line of boot record. if we can extract them from the FW file and instruct the meter to read them from usb then maybe....

are you sure there is no hardware issue with the display itself? or the LAN chip? those lan messages are still bothering me....
coromonadalix:
Windows Ce  by default  load   nk. ***   in ram and decompress it  to run ...   normally the bin vs the b0 contain more data and infos .. but both should contain configs / drivers and the Keysight   dmm executable software  ....

at some point  Windows Ce could be connected to Windows if it contains what it need to do that communication, that way once connected you see WinCe drive and files and can copy them out, export the registry etc ...    not sure in this case, i don't have theses meters to play with

https://supportcommunity.zebra.com/articles/en_US/Knowledge/Windows-CE-device-does-not-connect-with-Windows-10-with-Creators-upgrade-via-WMDC


unless you do have somekind of ssd emmc  or elses, it start in nand ram locations as mentioned,  some  on other threads managed to shift the allocation / address to be able to boot the dmm  ??

the Spear 320 failures ? , no one has clearly stated why it is failing,  voltages ?,  heat ? degradation ?

for the other peripherals as we can guess  usb and lan  hardware should come 1st   to be able to help if it crash ?  uboot or others ...  the spear 320 should contain what we need ? unless  ...

old 2023 thread
https://www.eevblog.com/forum/repair/agilent-keysight-34461a-doesnt-boot/
https://www.eevblog.com/forum/repair/keysight-34461a-179388/

34465
https://www.eevblog.com/forum/testgear/keysight-34465a-reliability/
Eng_tech:
Pretty sure display is good. As when it first boots you get a white background with the words Keysight Technologies in black and at the bottom of the display is a black bar that increases in length as the booting process runs. After that, the screen would display a blue graphics background image that says on it Keysight Technologies with a load bar at the bottom that would say "initializing and verifying hardware". Only if the meter is working correctly.  But I only get the very top part of that blue graphics background and the meter stops booting at that point or loading the OS. So, maybe it's something with "initializing and verifying hardware". DLL, driver maybe? You would think it would at least display the full graphics background but it stops loading it or sending it to the display. Or maybe where the image is stored is corrupted. Don't know yet.
coromonadalix:
previous fw  as 3.01 3.02  where about memory leaks, the latest v 3.03  ??


and a small note from keysight ?


have you tried the fw updater from keysight ?  +- 72 Mb
Eng_tech:
This is whats contained in nb.nb0. I used a utility called dumprom.exe to extract all the files to a folder. It's a large log of what was dumped and it won't all fit in this message so I'm attaching it as a text file.

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