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DL3021 to DL3031 Conversion Discussion

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Pedrofabian:
Hi all,
so recently I've come in possession of a Rigol DL3031 350W E-Load with a broken screen. I already had a working DL3021, so naturally I swapped it's screen to the higher end model.

Sidenote: I did go back and replace the screen on the DL3021 for anyone interested. It's an LCD with a glass/plastic cover. LCD part number is TM043NBH02. There was no finding an original piece of cover glass, but I did fine a Glass resistive touch screen digitizer of the same dimensions (105x65mm) which fit perfectly, looks like new!

Upon opening up the DL3031, I was surprised to find that it appeared to have no more MOSFets or other parts that the DL3021. In part, this made some sense, as the insides of the DL3021 are far too robust for a 200W load. The MOSFets are all in the same place and have the same part number.

I've already flashed the DL3031 to the DL3031A and the DL3021 to a DL3021A using the method outlined here
https://www.eevblog.com/forum/testgear/need-help-hacking-dp832-for-multicolour-option/

Naturally the question comes up, can you turn the DL3021 into a DL3031?
As it appears to me, the only distinction between a 3021 and a 3031 might be firmware.

Sanity check before I burn my perfectly good DL3021? Pictures attached.
DL3021: https://imgur.com/a/Kjg2z5o
DL3031: https://imgur.com/a/OFUONn9

electr_peter:
Conversion to *A models has been done with no negative effects, 21->31 conversion would be welcome ;)
Also, it would be great to know if the same method via SCPI could work for this hack.

Just be 100% sure before any changes - are you certain that DL3031 unit was DL3031 from the factory? If so, this makes whole DL3000 range (DL3021/3021A/3031/3031A) differs only in FW and front panel markings. Current idea is that DL3031 has more stuff in it, but that could be a myth.

Images in your links look very similar (you can attach pictures on forum post as well). I can't see all the details, but shunt looks the same, power MOSFETs seem the same, circuitry around is the same..., i.e., looks very promising.

Now, as you have both DL3021 and DL3031, can you test few identical load scenarios on both loads? Say, one at 200W, one at 40A. Look for heat dissipation, try measuring control voltages.

electr_peter:
Specs suggests no or almost no HW differences between DL3021A and DL3031A, as models differ only in:
* Maximum Power - 200W vs 350W
* Minimum Operating Voltage - 40A @ 1V vs 60A @ 1.3V (0.025 \$\Omega\$ vs 0.022 \$\Omega\$ estimated R_DS_ON)
* Current Slew Rate - 0.001 A/μs~0.3 A/μs vs 0.001 A/μs~0.5 A/μs
* Current Slew Rate - 0.001 A/μs~3 A/μs (>5 V) vs 0.001 A/μs~5 A/μs (>5 V)Max power is SW limit; internal resistance is almost the same. Current slew rate is slightly faster, but it is explainable by different max current. From specs:

--- Quote ---Current slew rate: rising slew rate for 10%~90% of the current (0-maximum current).
--- End quote ---

Firmware file is the same for all models of DL3000 range.
Looks even more promising :D

Pedrofabian:
Yes I know I can upload pictures but it was too many, it exceed the size limit

Yes this is an original DL3031 (non A version)
I have the test running now. Will allow to run for a little while before checking heat and some voltages.

Pedrofabian:
Ran both units at 200W for about 30 minutes
They both stabilized similarly to ~40C
I measured the voltages across most of the MOSFETs (the ones I could reach) and they are all biased with similar voltages.
Not super sure what else to check? Next steps or YOLO?

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