Electronics > Repair
Tektronix DPO 4104 kernel panic
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MarkF3837:
It's on the bottom of my DSP4104. Remove the cover and there is an opening in the Aluminum shield. A 1.27 mm pitch connector has 20 pins. I identified two; see the photo. Signal is 3.3V & 9600 b/s.
pcwrangler:

--- Quote from: MarkF3837 on January 04, 2022, 06:23:20 am ---Good idea: there's a single flash chip (AM29LV040B-90JC) in a 32-PLCC. Easy to rework. There are four mystery BGAs that appear to be on the same bus; they don't matter, because I don't have BGA rework equipment.

Where does the boot code reside? If it is in this part, then I'll need to get a programmer.

--- End quote ---

1. The bootloader does reside on that AM29LV040B. It is easy to remove/replace but yes you will need a programmer to do anything with it. Read it multiple times with it firmly in the programmer to compare against each other and rule out intermittent errors (indicating bad chip or bad contacts to programmer) and make backups! But first: Your log shows it skipped updating the bootloader because it was "same or newer". Have you tried the "force update" procedure mentioned in the firmware documentation? If you do, make sure you watch and copy the log in the process.
2. What is the full boot log withOUT trying to update the firmware via USB?
3. It is conceivable that the RAM is bad, as Adrian said, and that is causing havoc with the install. If the above doesn't work, I would spend the ~$20 and give it a try.

Good Luck
MarkF3837:
Finally had some free time. After replacing flash and RAM, behavior is the same, even after adding "forceinstall.txt" to the USB drive. Could something in the bootloader be corrupted? Has anyone uploaded their flash contents? I could try booting with that code.
pcwrangler:

--- Quote from: MarkF3837 on February 03, 2022, 02:02:26 am ---Finally had some free time. After replacing flash and RAM, behavior is the same, even after adding "forceinstall.txt" to the USB drive. Could something in the bootloader be corrupted? Has anyone uploaded their flash contents? I could try booting with that code.

--- End quote ---

Did you save the log when you tried the force install?
pcwrangler:

--- Quote from: MarkF3837 on February 03, 2022, 02:02:26 am ---... Could something in the bootloader be corrupted? Has anyone uploaded their flash contents? I could try booting with that code.

--- End quote ---

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