Products > Test Equipment
LeCroy WaveSurfer 24MXs-B Motherboard
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tppc:
Hi there,
I just collected a non working LeCroy WaveSurfer 24MXs-B.
When turned on, the front panel buttons light up for 1 sec, fans do spin and that's all.

No beep, no boot, nothing except the fans and LCD backlight.
I connected an external VGA monitor, but no signal.

I read that the PSU on these WaveSurfer series was often an issue.
Not this time. Mine is OK, I tested all voltages (+3.3V, -3.3V, 5V, +12V, -12V, -6V) all measured OK.

I also tried powering the motherboard with an external ATX PSU and a VGA monitor.
It does not boot, and still no VGA signal. BIOS 3V battery is OK.

Conclusion, the motherboard is Kaputt!
I also read that this mobo is unobtainium.

Does anyone have a suggestion for a replacement solution?
The board is the first series with PS/2 port and PC104 slot.

Regards,
tppc
Martin72:
Hi,


--- Quote ---No beep
--- End quote ---

Got an onboard beeper ?
Possibilities to check CPU and RAM externally ?
Can you upload a pic from the motherboard ?

Martin
tppc:
hi,
thanks for the reply.

no beeper on the mobo, the beeper is on the PC104 extension board.
I tried with and without the RAM, no difference.

I have no way to test CPU/RAM externally.

Here is a picture of the back of the board (I had it on my smartphone)

Will not be able to take a picture of the other side (for the moment) since I put it back in  the scope
nctnico:
I'd try reseating all jumpers (if any) + changing the processor and memory first. But before putting a new processor in, check the processor's supply voltage & jumpers. I also spot some fuses on the back of the board; are these OK?
Martin72:

--- Quote from: tppc on May 08, 2022, 08:19:44 pm ---I tried with and without the RAM, no difference.
--- End quote ---

Well, that´s not a direct indicator except the RAM got an short circuit.


--- Quote ---Here is a picture of the back of the board (I had it on my smartphone)
--- End quote ---

Seems to be a µATX board with 20-pin ATX supply connector, would check the fuses too like nctnico suggest.


--- Quote ---Will not be able to take a picture of the other side (for the moment) since I put it back in  the scope
--- End quote ---

A pic from the top-side of the board would be very helpful - For you, in the end.. ;)
(Because chances are high to identify it)
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