Tektronix DPO3034 Oscilloscope Help, Won't Turn On

[tixdave]

Hello, I have a DPO 3034 that is not turning on. When you first press the power button the lightable buttons turn light up but no screen, fan turns on. Looking at the debug data it gets to the DRAM section and stops, fan is still running.

Code: [Select]

U-Boot 2009.08 (Feb 02 2011 - 10:33:21) Tektronix, Inc. V1.08

CPU:   AMCC PowerPC 440EP Rev. C at 333.333 MHz (PLB=133, OPB=66, EBC=66 MHz)
       Bootstrap Option G - Boot ROM Location I2C (Addr 0x54)
       Internal PCI arbiter enabled, PCI async ext clock used
       32 kB I-Cache 32 kB D-Cache
Board: Tektronix Redondo/Metro AMCC 440EP Main Board
        VCO: 666 MHz
        CPU: 333 MHz
        PLB: 133 MHz
        OPB: 66 MHz
        EPB: 66 MHz
Programming DIA...done
I2C:   ready
DRAM:  128 MB

Might just need to send in for repair.

[tom66]

U-boot usually happens after memory training is done (that would be done in a first-stage bootloader or boot ROM)... so DRAM probably OK.  Best guess is that the kernel image is corrupted or the U-boot image is corrupted, or some other hardware issue is present that is resetting the CPU just as things get going, like a power supply problem.

If you have some way to reprogram the flash IC with a known good flash image then it may fix the issue.  Of course, it is possible calibration data is loaded there, so that may cause other issues.

[tixdave]

It is consistently getting stuck there so I don't think it is a power supply issue. It has been sitting on the bench for a while and haven't turned it on probably in about a year, but last time I did it was working normally. Probably corrupted image somehow from just sitting?

[tom66]

Flash memory can do that unfortunately, as the memory cells self-discharge over time.