Electronics > Repair
Tektronix DPO4054 stucked at tektronix splash screen
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tekfanatic94:
Hello everybody,

First of all I would like to wish you all the best for the New Year!

I'm actually trying to repair a TEKTRONIX DPO4054 that doesn't boot, it stays stucked at the DPO splashscreen.
After investigating I've captured the following console port trace:

.....

Major ver num: 2 Minor ver num: 68
Initializing Mia[0]

PA Bus error. Skipping initialization of devices on PA bus
Initializing Ibm440[0]
Initializing HFD204ADC[1]
Initializing HFD204ADC[0]

.......

I've compared this trace with one of a DPO4032 that works fine:

....
Initializing Mia[0]
Adg523 detected, patching reg offsets
Initializing Tek0005[0]
Initializing Ibm440[0]
Initializing HFD204ADC[1]
Initializing HFD204ADC[0]
....

It seems that the scope failed to communicate with the ADG523 and TEK0005 ASICs, that are connected on the PA Bus .

My question is, does any one knows what is the PA BUS and which ICs on the PCB are the ADG523 and TEK0005 ?

If somebody can help me it will be great :-)

Thanks in advance for your interest and your help !
mairo:
Hi all,

I think I may have similar problem - My Tek DPO4054 is also stuck at the initial 'splash screen' - it happened yesterday.

The scope has never had any issues, or signs of such. Few years ago, I updated the firmware to the newest one available (2.68).

Yesterday while monitoring two 5V PWM signals the scope suddenly turned OFF by itself (screen and fan OFF), and then after ~1sec back ON again by itself, but this time it just got stuck at its 'splash screen'. I do not think it was a power surge as there were other equipment also running and non of them showed any sign of losing  power.

Now when you turn the scope ON, it just shows the Tek 'splash screen' and I can hear the fan turning ON, but that's it, it just stays at this level. Normally, the splash screen will show up first, following by the fan and a clicking of relays, and then the screen showing the waveforms will appear.

I tried to load the firmware back, but nothing happens, just stows the splash screen, and the fan is running as well.

Any help will be greatly appreciated!   
pinkman:
FWIW these scopes are quite repairable, but due to their low depreciation (they are still worth decent $ when sold by a repuatble test equipment vendor) there is not much repair info out there, and this will continue to be true until they get closer to obsoletion.  As they approach obsoletion, the common failure mode will dictate whether they are even around 10 yeras from now.  ASIC failures will permanently brick the scope. BOM and schematic likely will never be released.  Due to limited number of these scopes in circulation and limited software upgrade potential, combined with how easy it is to activate existing software options, it is unlikely that much effort will ever be put into firmware analysis.  Repairs on this series are still very expensive and most of those non-corporate persons in the know understandably won't give away the information that is out there.  Due to Tek restructuring/changing hands after the development of this series, I fear that much of the really useful information will be lost forever.

If ASIC has failed, you're better off buying another scope, I do not believe that you will find a replacement.  If you were able to x-ray the BGA's you might find some potential issue there but I haven't repaired enough of these to know how common this is.  Make sure all supply rails are regulating properly.  You should be able to use another scope to discover which bus you're looking for, but the actual problem may not be apparent unless you can compare measurements to a known working scope.  Be aware that there is little difference between the MSO/DPO4000 series especially from this respect and any DPO/MSO40x2 or x4 should work for comparison.  Good luck.
JohnPi:
I have 3 of these scopes stuck like this. Two are DPO 4054 and one is a DPO 4104. I opened the 4104 up to see what was inside -- there is a small blue pushbutton on the main PCB (behind the screen) -- pushing it seems to restart the (failing) boot process.

The fans are all running, and screen is bright -- but the buttons don't work and it doesn't move from the splash screen. Any ideas on what I can do to get past this ? Since both 4054 are stuck at the same point, I don't think there is any value in swapping modules.

switch998:

--- Quote from: JohnPi on February 28, 2019, 05:14:59 am ---I have 3 of these scopes stuck like this. Two are DPO 4054 and one is a DPO 4104. I opened the 4104 up to see what was inside -- there is a small blue pushbutton on the main PCB (behind the screen) -- pushing it seems to restart the (failing) boot process.

The fans are all running, and screen is bright -- but the buttons don't work and it doesn't move from the splash screen. Any ideas on what I can do to get past this ? Since both 4054 are stuck at the same point, I don't think there is any value in swapping modules.

--- End quote ---

I don't have a 4054 to help, but outside of verifying the required voltages, I would start out by finding a UART port and capture the console output to find where the scope is freezing and perhaps execute a couple commands if a prompt is available. If there is an onboard lithium cell / battery backed RAM chip (particularly if it has an integrated RTC), you might want to verify they are still good since some scopes can freeze if those are not working properly.

Edit: I see that the first post has a sample output from another user. If you have a bus error like the OP I would suggest X-Raying the BGAs like another user suggested. Here's a an issue on the DPOP7104 where a rework on the ADC resolved their issue: https://translate.google.com/translate?hl=en&sl=zh-CN&u=http://www.uxcer.com/NewsShow.asp%3FBid%3D20&prev=search
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