Products > Test Equipment
Upgrading Mainboard in Lecroy DDA-3000 (aka WavePro 7300a?)
ollopa:
The MB is responsible for keeping the power supply on. The fact that you can jumper it and all voltages read properly leads me to believe that the power supply is fine.
Could also be a corrupt BIOS. You could try powering the MB with a known-good ATX power supply or try powering a known good MB with the scope power supply.
analogRF:
--- Quote from: ollopa on December 31, 2019, 07:03:58 pm ---The MB is responsible for keeping the power supply on. The fact that you can jumper it and all voltages read properly leads me to believe that the power supply is fine.
Could also be a corrupt BIOS. You could try powering the MB with a known-good ATX power supply or try powering a known good MB with the scope power supply.
--- End quote ---
but the power switch goes to the auxiliary display board (on the side panel) and that board is connected to a PCI card among other places, so my thought was that something is happening to the power/standby line in that path...
can it be the RAM stick? I must have a compatible RAM laying around somewhere in this mess to replace it...i cannot find it right now...but i dont even get the bios screen...its all dark and blank on lcd and vga...
nctnico:
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.
analogRF:
--- 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...
nctnico:
Well the best way ahead would be to test the PC part seperately. Take the cards outs and power the motherboard from a seperate PC style PSU. Does the battery on the motherboard still has some juice in it?
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