Electronics > Repair
Agilent 34461A corrupted flash
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Eng_tech:
Well just to isolate the problem with this meter I put my front panel on a known good unit to see if that unit would act the same during the boot process and it did. This eliminates the main pcb from having anything to do with the problem. So, the problem still resides with the front panel. I'm going to check out the best I can the Ethernet controller on the front panel because during boot the unit thinks it is wired to a network which it isn't. This maybe a clue of some kind. Odd that they put the ethernet controller on the front panel. I would think they would have that near the network connector on the main pcb.
Eng_tech:
Success! I think. I replace the LAN/Ethernet IC LAN8710A and the unit completely boots up now. Only one other condition exists and that is a little red box in the upper right corner that says "error". It passes self testing also. I am thinking that maybe the meter lost it's calibration information but could be wrong. Tried to do a self calibration but the meter is locked. Firmware updates are also locked. An odd thing that when this meter finally booted up it did a firmware update by itself. Sad installing firmware update in 2 parts. Same version. Kinda strange but maybe has something to do with the new spear microprocessor.
analogRF:

--- Quote from: Eng_tech on January 17, 2025, 02:54:51 am ---Success! I think. I replace the LAN/Ethernet IC LAN8710A and the unit completely boots up now. Only one other condition exists and that is a little red box in the upper right corner that says "error". It passes self testing also. I am thinking that maybe the meter lost it's calibration information but could be wrong. Tried to do a self calibration but the meter is locked. Firmware updates are also locked. An odd thing that when this meter finally booted up it did a firmware update by itself. Sad installing firmware update in 2 parts. Same version. Kinda strange but maybe has something to do with the new spear microprocessor.

--- End quote ---
great !
I told you I was very suspicious of that LAN chip because the log was strange.
you should be able to see the error in the error list. also the boot record might show what error is happening
can you connect to the ethernet? does the meter get IP?

no calibration is not lost. it is in a eeprom on the main board but I think there is a procedure to read that calibration and copy to nand because you changed the front panel. that could be the cause of error
you can update the FW either with lan or usb stick.
Eng_tech:
Jumped the gun I guess. It is randomly doing the same thing upon booting up. Sometimes the meter is working normally and sometimes I just get what I was getting before. It is a big step in the right direction I think. I have to find out why it is randomly working. Yeap, the error had something to do with calibration an serial numbers not matching. But for some reason after looking at the log the errors went away. Still gotta find out what is going on. Maybe I have a bad solder connection on that LAN chip. It was a bit of a pain getting it mounted and soldered. I used hot air on it both on top and below with and Chip Quik paste.
coromonadalix:
Lan  chip  that's a 1st report i've seen  @analogRF was right

you should be able to realign it, but theses have a thermal pad under them ....    :-+   or  you may burn it  ?   

i would have tried the meter without it  just to see if it get working and stay stable in reboots ?  and do a factory reset ...
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