WHY reset on keyboard doeznt work?? A1200 (another 1.D4, 3.0 ROMs :)

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So, i have another board (only board and keybo). it works well for couple of days, but i cant reset it on keyboard. only switch on/off on psu works

Where i must seek an error??? Some shorted traces on board?
PLEASE help me somebody with this issue, please!

Thanks for all your opinions guyz! I think it can be repaired, but i hane absolutelly no clue HOW  :-(  :-(  :-(

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i was testing about 4 keyboards - its the same problem. maybe prevous owner was trying something with keyboard adaptor and fried something. I have manuals, i will look for some small ics around, thanks, but without osciloscope it will be hard to find bad parts i think. i must buy one

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or maybe i must sell kidney first

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all keys working very well, i tested a lot of combinations, only that damn reset doez not work, mysuteridesu

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PC keyboard? i dont have any adapters:(

But! aother issue! If its cold, reset work well, but after 30 minutes if i press reset then screens going to black and its over, after on/off psu it works. i dont get it  damn.

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gomen
i had a russian teacher for english lessons, i will try.

If A1200 is cold (e.g. morning), combination ctrl-a-a works well.

But later (approx 20 minutes) if i press reset combinaton then screens going to black and amiga wont boot! (no drive seeking)

I must turn out PSU, wait (~20 minutes) and voila, reset works again.

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Respect!
Thanks a lot Stedy, its finally a useful answer!
I will try to measure.