[SOLVED] Agilent DSO 6034A [Bootloop]

[joe500]

Hello, I've bought a DSO6034A from my company.
It was working great but one time I tried the logic analizer(was enabled on this model)
and after activating the channels the scope freezed. So I just powered it off and back on again.
Now it hangs in a bootloop, where you can see the initialisation sequence(leds blink). But after
the sequence only the 'Single' stays lit but the screen is still black. After a view seconds the startup sequence
starts all over again and never stops. I've read that this is a known problem with the eeprom of the scope.
Is there any possibility to flash a new firmware or just reset the eeprom using one of the onboard headers?
Any suggestion would be fine

PS:I've also soldered a wire to the 'Reset' Pin(#14) of the AMD chip and grounded it for a view seconds, but that wasn't helping either

[Carrington]

EEPROM? AMD chip?
Can you post a picture?

Have you tried to recover it via usb?

[joe500]

Thank you very much Carrington for your help!!!

I've tried the usb method you have suggested, but with no luck. The usb port isn't even powering the stick.
I've tried with 2 different sticks both formated with fat32.
Another thing I've tried was to desolder the onboard battery in hope of clearing any mess on the eeprom - also no luck.

The scope uses the AM29LV128MH ic.

[Carrington]

I've tried the usb method you have suggested, but with no luck. The usb port isn't even powering the stick.

Check some voltages, see the service manual, pages 94 to 98.
Some pictures here: https://www.fingers-welt.de/phpBB/viewtopic.php?f=14&t=4579

Another thing I've tried was to desolder the onboard battery in hope of clearing any mess on the eeprom - also no luck.

Not a good idea, I think. Anyway, the battery is fine?

The scope uses the AM29LV128MH ic.

Ok, yes, it's from AMD, it is the flash memory. On other devices is a "Spansion" S29G...

[joe500]

I've checked all the voltages from the table:
L3204 3.3 (+- 0.1) U3202
L3201 5.0 (+- 0.1) U3202
L3301 1.5 (+- 0.1) U3300
L3302 -5.2 (+- 0.1) U3301

all looks fine. The battery also supplies the rated 3V. When I bought that scope it had the same issue. After restarting it 10 times it was working again,
but now even the restarts dont help . If it is firmware related, can't i just flash it over some interface like uart?

[ElecSeb]

No idea how to repair (out of my scope), but I read you formatted as FAT32, are you sure this is supported?
Older devices might support FAT16 better -> you might give it a try (unless someone here is confirming FAT32 should work).

Depending on the age of the device you might also try to use a smaller stick (512mb or less when available)

[Carrington]

This oscilloscope is probably more than 20 years old, because it only has one XCF04S on the board, so yeah, maybe the flash is defective. But who knows?

Also, do you have all the necessary tools to remove it and solder a new one?

[joe500]

@ElecSeb I will try if that will do the trick
@Carrington Soldering would not be a problem, but changing the flash ic without programming would help?

[Carrington]

It is not possible to program an am29lv128 in an easy way (no jtag, no spi).  You would need a new flash (s29gl128), and probably write the bootloader to it.  There are cheap programmers (min. 70€ or so), but there is no guarantee of anything.

There are a lot of voltage regulators on the board, I think it's worth checking them all.  Take a closer look at the previous link.

[Carrington]

One possible programmer:

FlashcatUSB xPort ( 35 USD) + TSOP-56, Type A ( 30 USD).
    https://www.embeddedcomputers.net/products/FlashcatUSB_xPort/
    https://www.embeddedcomputers.net/products/ParallelAdapters/

But, I'm not 100% sure if the first one can program an AM29LV128M.
I got a reply from the manufacturer, and he basically told me that it should work.

[beyond]

Hi there,

I meet the same problem with my DSO7014B, could you please tell me the way how to sloved this problem, thanks!