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Upgrading Mainboard in Lecroy DDA-3000 (aka WavePro 7300a?)

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sixtimesseven:

--- Quote from: nctnico on December 31, 2019, 06:29:16 pm ---I'd connect an external monitor first to verify whether the motherboard boots or not. AFAIK Intel boards are not known for having bad capacitors.

--- End quote ---

The caps on my old mobo close to the cpu were bulged...

sixtimesseven:

--- Quote from: analogRF on December 31, 2019, 11:31:18 pm ---
--- Quote from: nctnico on December 31, 2019, 08:07:22 pm ---Again: what happens with an external monitor connected? That is the first step to take before anything else. Also connect a speaker to the motherboard to hear if you get any beeps.

--- End quote ---

as I mentioned before, nothing... all blank.. I need to figure out why it shuts down in <1 sec first. That could be the source of the problem
even though I can manually power on the system by puling down the green wire but if there is an underlying issue it may still not boot.

at the moment my suspect is that auxiliary display/fan board on the side where the power switch and also lcd are connected
don't know how to troubleshoot it yet...

--- End quote ---

If it is the power switch, you can manually bridge the two pins which provides the start functionality on the "front panel header" on the mobo.

Mechatrommer:
how about removing RF/ACQ board from PSU and PC section, just to narrow down the problem and avoid propagation? just a thought.

analogRF:

--- Quote from: sixtimesseven on December 31, 2019, 11:50:49 pm ---
--- Quote from: analogRF on December 31, 2019, 11:31:18 pm ---
--- Quote from: nctnico on December 31, 2019, 08:07:22 pm ---Again: what happens with an external monitor connected? That is the first step to take before anything else. Also connect a speaker to the motherboard to hear if you get any beeps.

--- End quote ---

as I mentioned before, nothing... all blank.. I need to figure out why it shuts down in <1 sec first. That could be the source of the problem
even though I can manually power on the system by puling down the green wire but if there is an underlying issue it may still not boot.

at the moment my suspect is that auxiliary display/fan board on the side where the power switch and also lcd are connected
don't know how to troubleshoot it yet...

--- End quote ---

If it is the power switch, you can manually bridge the two pins which provides the start functionality on the "front panel header" on the mobo.

--- End quote ---

yes, that's what I almost do (I pulled down the green wire on the ATX connector) but I think the fact that the power does not stay on
shows there is an underlying fault somewhere and that can be the source of the whole problem. I dont think it's the power switch itself. It does its job correctly

analogRF:
I confirmed that the power switch actually shorts the two pins on the front panel power connector on the bottom left corner of the motherboard like a regular PC. But of course it shuts of in 1 second.

I could not find a place to connect a speaker. Then I realized that the board actually has a tiny buzzer/speaker on the bottom left corner (burried under the bunch of cables) but it does not sound anything during power on.

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