Products > Test Equipment
LeCroy WaveSurfer 24MXs-B Motherboard
nctnico:
Did you try a different processor and RAM? Get a different board (known good) with processor and RAM so you can swap things over. I would have done that before attacking (and possibly damaging) the board!
tppc:
Well, I actually have a second unit (fully working identical oscilloscope).
But :
- To gain access to the motherboard, you need to disassemble the whole instrument (tens of screws) + remove all other boards, which is a real pain in the butt :palm:
- I did not dare swapping parts from the good unit to the bad one, because, if I burn the good parts on the bad scope, then I would lose both units :-[.
nctnico:
I agree that using the parts from a working unit isn't the best idea.
For such tests you have to buy a motherboard that is compatible with the processor and the memory (preferably with processor + memory so you have a working combination but also make sure to buy a processor and memory). It doesn't matter whether this motherboard fits the oscilloscope or not, the intention is to find out which part is faulty. From what you have posted so far it seems you don't know whether the motherboard, processor or memory is faulty. The first step towards a succesfull repair is to determine which part is actually faulty.
tppc:
I can be wrong, but my feeling is that :
a) RAM + CPU are OK
b) Motherboard is defective.
I removed both RAM + CPU and I still measure 8 Ohms across some unknown supply rail on the mobo.
(not on any of the ATX connector pins)
BTW all voltages on the ATX connector are OK.
My feeling is that there is some low voltage (1, something volts) generated on the motherboard that could be defective.
The problem is that there is no indication on the silkscreen that would show the low voltage rails, I don't know, 1.7 V or whatever...
nctnico:
Measuring 8 Ohm on a supply rail can be OK; it is not out of the ordinary. Again: first determine 100% which component (motherboard, CPU or memory) is actually faulty through elimination. Guessing leads to destroying good components.
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