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components: resistor to fet/bjt control ; resistor to limit current to speaker ; the fet/bjt diode to protect motherboard components from the speaker, which may be coil based (or piezo speaker) "speaker" is driven with pwm signal. use a oscilloscope to measure the signal coming from "?" in...

in-circuit measurement should be enough for that one

For my own interest I measured the clocks again with better high frequency probing technique. Signals were measured one at time, at same locations as earlier. Both have 150 ohm pull-ups installed, unlike in my earlier picture which had just one. Seems one would still be alive even without...

Also: Please stop soldering random stuff on your motherboard if you can't measure what it does and really understand what you are doing. I would deeply hate to see boards having own repair done or attempted at sale at used HW market.

https://gathering.tweakers.net/forum/list_message/50733063#50733063 I did fix show in above url to my Supermicro board. There are two LPC clocks in use. My board's symptoms were: - no boot beeps - ipmi wasn't reachable via local buss from operating system (ipmitool, kernel ipmi_si module) -...

Have you guys looked those reworked boards really carefully? I assume there would be one or two tiny smd resistors added somewhere. I would rather rework solder those myself than wait 2+ weeks for board returning back. Edit: I looked around docs a bit. I woud guess JTMP1 (TPM header/Port 80...

I it really is the same board, could you post high resolution photos of mod wires and resistors they soldered?

Does Supermicro still accept RMA for C2000 boards purchased 2013/Q4? How their RMA process works for a home user in EU, mainly shipping in practice?

You could power both Supermicro boards directly from single 12V psu without PicoPSU. Atleast my board works nicely when powered via 4-pin connector J1. And don't do what you seem have done in all pics. A1SAi/A1SRi-series motherboard manual and quick reference guide have warning:

Could you measure system power consumption at idle (and full cpu load) in coming motherboard reviews? Just like you measure in processors reviews.

Supermicro Haswell X10 E3-1200V3 4th generation Motherboards Web Hosting Talk - View Single Post - Supermicro socket 1150 X10 series (Haswell E3-1200V3)