Hello,
i have a problem with a motherboard (D3445-K11 GS1) of a KRC4 compact cabinet, manufactured 2018. There were around working 100hrs on this robot, used only for exhibition and development purposes.
The robot was working ok, until a plastic strap went between the blades of the CPU fan. The fan stopped, so did the cabinet and never came up . When i started it up there is a red led glowing around the USB ports (photo attached) with signage next to it: VOLTMON FAIL. Attached an external monitor and there is no signal from the cabinet at all.
I tested the fan - it is working fine. Also replaced the motherboard with another one and the robot is ok.
My question is - is that a repairable damage? Is there something i can do to revive the robot or a new motherboard is needed?
I suppose the damage is due to the fan overload and eventually the voltage supply damaged/dropped or something.
Any ideas where i can look will be appreciated!
All the best!
V

Problem with a krc4 compact cabinet
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vvelikov -
January 9, 2025 at 5:32 PM -
Thread is Unresolved
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So what i tried - removed the bios battery, triyng to reset the memory somehow ... just to make sure this is not some error saved somewhere there and preventing the start of the controller.
I am planning to feed 27V voltage to the CPU fan externally (leaving it in its socket to be able to send RPM information) just to check if the lack of fan rotation is preventing the startup of the PC
What i am thinking is may be the power feed line to the fan was overloaded and may be burnt and it is unable to drive it now. Not sure where to look for this as i am struggling to find information about this motherboard - even basic manual with description of the main functions - it is Fujitsu w26361-w4143-z4-02-36 or at least that is etched on it -
Does the fan plug directly into the motherboard? If so, VOLTMON FAIL suggests that the fan failure managed to damage a voltage regulating element on the motherboard, enough that the CPU and/or peripherals are not getting correct voltage to boot.
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Does the fan plug directly into the motherboard? If so, VOLTMON FAIL suggests that the fan failure managed to damage a voltage regulating element on the motherboard, enough that the CPU and/or peripherals are not getting correct voltage to boot.
Yes, it is plugged directly. Sounds logical, not sure how i can check it. Will look around for microelectronics specialist to try it out - cannot se other option
Thanks! -
my experience is that 80% of motherboard failures are that same thing. the other 20% are Ethernet port getting zapped. for a pricey industrial grade motherboard, i would expect design that is more protected. TVS diodes are dirt cheap - we are talking pennies...
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It is pricey really - 2000 eur atm