Hardware SD Card Reader problem

[Theorem]

Have a switch that doesnt detect SD card. Only Hekate is able to boot but warns about 1-bit Card Mode. Nothing else works as probably nothing else supports this 1-bit SD Card mode (no OFW, no ATMO - cant start, no SD card, no SXOS)

I did search and found some topics regarding this:
1) Broken onboard connector - checked continuity to points, nothing broken, no missing pins visual, looks very pristine
2) Bad Card reader - tested four different readers from my donors. No go
3) Bad SD Card or format - tested 3 different cards 8,128,256 GB with Fat32, exFat - no go

Is there anything else hardware or software related to check ? Is there some other chip responsidle for SD card transfers on board which i need to replace from donor ?

Thanks for any help

 

[babycomingsh]

why are u use the bad SD card???

 

[atkins103]

I would also like to know the solution to this as I have the exact same problem. Multiple cards, multiple readers, everything looks clean and pristine. I am about to hard wire the reader to the points on the board to rule out the connecter on the motherboard. Any help would be much appreciated.

 

[Theorem]

I also tested the same card and reader in other switch and it works perfectly. So the problem is in the switch itself, but onboard connector seems to be without any defect (beeped all from board points traces up to reader). There is probably some other component on board involved in SD card management...

 

[Theorem]

Ok, finaly solved. It was the most obvious reason - bad SD reader on board connector . Even it looked very pristine, after pusing all pins with tweezers one pin became loose. I soldered new connector from donor and SD reader is working again...so if it looks good, dont think it works and verify.....