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

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nctnico:
Did you check the battery on the motherboard yet? Did you also try to re-seat the CPU?
Are all the jumpers installed? The J9J4 header should have a jumper on pins 1&2 for normal operation.

analogRF:
I have been running around all day and could not sit down and concentrate on this thing... :palm:

the cmos battery was 0V which I replaced. Reseated the CPU and memory and also used anther stick of memory instead...no change...it shuts down in a second and if I manually keep it powered on, there is nothing on display (not even back light) and nothing on VGA out. no beep sound from motherboard either.

I found out that if I keep punching the power switch repeatedly and quickly it finally stays powered on and I can also power it down by
pushing and keeping the power switch. of course the result is the same, no sound and no picture...all caps around the CPU seem ok.

EDIT: and jumpers are all in the right place

analogRF:
Ahh, I think this looks very suspicious: there is an "empty" 8 pin socket on the auxiliary display/fan board (on the side panel of the unit which connects to the LCD)   :-//  It's marked U17. Is this normal?

My WP7300A is on loan and I dont have it with me and for the life of me I cannot remember if that 8 pin socket should be empty or there is an IC in there.

ollopa:
That socket is empty on my WP7KA too -- I don't think it's a problem.

There's nothing so far indicating that the board you keep suspecting has anything to do with your problem.  Go get your motherboard to boot up with a regular PC power supply before you worry about the scope chassis.  My money is still on your motherboard being bad.

analogRF:

--- Quote from: ollopa on January 01, 2020, 11:47:01 pm ---That socket is empty on my WP7KA too -- I don't think it's a problem.

There's nothing so far indicating that the board you keep suspecting has anything to do with your problem.  Go get your motherboard to boot up with a regular PC power supply before you worry about the scope chassis.  My money is still on your motherboard being bad.

--- End quote ---

yes, I took the AGP card out which also disconnects that board video connector and ran on a VGA monitor only but no change...I am beginning to suspect the CPU itself...not sure if I have a spare in my junk box...but since there is not even a beep and apparently no BIOS running, I think the CPU itself is dead... I will take a PSU out from an old computer here and try to run the motherboard alone with no cards at all...

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