Electronics > Repair
Tektronix DPO4104 self test errors. Repair attempt diary
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darkstar49:

--- Quote from: analogRF on September 02, 2020, 03:28:19 pm ---
anyways, the problem is that there is no place to enter option keys.
Now I do have a menu that enables to transfer options from option module to the scope permanently  :phew: so it seems the only way is to program option module several times and transfer the licenses to the scope. Is it EXACTLY the same as TDS3000? can somebody confirm this please.

as you see in the picture below, now there is also a License Type > option menu but then it says No options available (grayed out) and there is no place to enter an option key. Apparently in DPO3000 and MDO4000 one can actually enter an option key.

So my only chance seems to be reprogramming modules and transferring to scope, any other suggestion is welcome

--- End quote ---

I can confirm reprogramming any TDS3 module with the DPO4000 option name and transfer it to the scope works... a bit tedious, although anything but complicated...
koziymf:
Do by any chance you know the location of UART RX pin on MDO4000 series?
I am trying to debug intermittent hangs on logo screen after the unit being off for 1+ day.
dbator:

--- Quote from: analogRF on September 03, 2020, 01:54:33 pm ---ok, so it seems i am only talking to/for myself in here but what the heck...I'll use it as my repair diary for now .

--- End quote ---
Good one :D
Anyways, those SPC failures make me worry about lifetime of the scopes and I'm quite sure, we need a solution for that. I searched a bit the forum and there is not much information about the SPC. So I would say, it will be not easy to find a solution.
I may be not a big help for you, but I just want to ask about current status of the repair. Did you solve the issue?


--- Quote from: koziymf on September 06, 2021, 07:52:09 pm ---Do by any chance you know the location of UART RX pin on MDO4000 series?
I am trying to debug intermittent hangs on logo screen after the unit being off for 1+ day.

--- End quote ---
Did you solve the issue? Intermittent hangs may be caused by a bad DRAM IC.
analogRF:

--- Quote from: dbator on September 30, 2024, 10:51:53 am ---
--- Quote from: analogRF on September 03, 2020, 01:54:33 pm ---ok, so it seems i am only talking to/for myself in here but what the heck...I'll use it as my repair diary for now .

--- End quote ---
Good one :D
Anyways, those SPC failures make me worry about lifetime of the scopes and I'm quite sure, we need a solution for that. I searched a bit the forum and there is not much information about the SPC. So I would say, it will be not easy to find a solution.
I may be not a big help for you, but I just want to ask about current status of the repair. Did you solve the issue?

--- End quote ---

yes in that particular case I came to the conclusion that the DEMUX chip needed to be reballed or at least reflowed. It is absolutely not possible without a professional rework station so I gave the board to a friend and it was reballed and reinstalled and the scope was fixed.
But I have worked on other SPC problems in DPO3000 and DPO4000/B scopes so it's not always the DEMUX chips
dbator:
It's quite interesting how just bad solder connection may cause such subtle issue, instead of really serious failure. Just like you wrote. Maybe there was missing some kind of termination (if there are any) or any GND or supply voltage line from a voltage rail.
Congrats you solved the issue. I think it would be not good to fail after that deep and time consuming investigation.
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