Display issue Lab Power Suply 3005d Velleman/Korad

[Neutron72]

What might have happened to the display on my Velleman (Korad) Labps3005d. I had to change a faulty rotary encoder and after a misshapen with the reassembling, one row of the pins of the connector J6 on the main board ended up connecting the wrong row on the connector of the key board. Not noticing this I powered up the power supply and ended up with the display issues shown in the attached pictures. The different patterns, on the voltage and current display, turns up different every time I power the unit on and off. Pressing any of the buttons most likely have an effect according to the multimeter measuring the output. With the output turned on I can see the the voltage being changed accordingly, on the multimeter. So the values measured inside the power supply works but it doesn't show up on the display. Maybe it's not worth the money to fix it, but the experience of troubleshooting the problem might be worth some time spent.
Any thoughts and ideas?

[tooki]

Most of the schematics can be found here:
https://elektrotanya.com/korad_ka3005p_velleman_labps3005d_power_supply.zip/download.html

And here: https://www.eevblog.com/forum/repair/korad-ka3005p-power-supply-calibration/msg370823/#msg370823

https://github.com/djedditt/ka3005p-display


Looks like the displays are bit-banged via plain old 74HC595 shift registers, so that’d be a good place to start. (The schematic in the zip showing the display driver as a 74HC95 has to be a typo, because it matches the 595, while the 95 is a 4-bit shift register, which simply doesn’t match the schematic and doesn’t even have the same number of pins.)

[Neutron72]

After some gathering of equipment and spare parts, and then some beginners mistake of riping off traces and pads, desoldering the damaged shift registers, and then repairing traces and pads, I managed to attach two new 74HC595D shift registers. And guess what, IT WORKS A TREAT!!!
Thanks a bunch "tooki" for the pin point tip of what might have been the problem.