Hello.
When i power on the shuttle hot 433 motherboard, the keyboard lights up. But totally not responding. Dallas has been replaced. Tried another keyboard. Nothing unfortunately.
Somebody any idea?
Welcome. Have you verified that the keyboards work, by using them on other systems? Could be the case that the ones you used have bad capacitors. The last 3 PS/2 and ATs I got all exhibited this behaviour of lighting up, but not responding to key inputs.
Defective UM8886AF/BF?
See this topic:
Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)
giantenemycat wrote on 2026-03-24, 13:27:Welcome. Have you verified that the keyboards work, by using them on other systems? Could be the case that the ones you used have bad capacitors. The last 3 PS/2 and ATs I got all exhibited this behaviour of lighting up, but not responding to key inputs.
Thanks!
Yes, both keyboards work fine on all my other motherboards and computers.
majestyk wrote on 2026-03-24, 19:24:Defective UM8886AF/BF?
See this topic:
Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)
Thanks!
I will check it out.
Could also just be connection to one of the pins on the AT DIN keyboard plug. If you're seeing num/caps blink or light up it's likely not the +5V or ground but it might be data or clock pins.
If you have a multimeter you might check whether those show 5v, which they should if there is no interruption somewhere between the keyboard controller and connector, or a short to ground.
I've seen a few boards with keyboard problems that turned out to be damaged/eroded traces. On quite a few boards - tho luckily not the Shuttle 433 - the keyboard traces run right under where the battery sits, and so they can be among the first to suffer damage. Usually easily fixed with a bodge wire from the controller or the point where the trace is interrupted.
