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LeCroy WaveSurfer 24MXs-B Motherboard

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tppc:

--- Quote from: nctnico on May 29, 2022, 09:09:26 pm ---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.

--- End quote ---

OK, thank you for this information  :-+, I thought it was too low.  :-//

I will follow your indications and find a way to test CPU + memory.

Thanks.  :-+ :-+ :-+

nctnico:
With a working motherboard, you can also check supply voltages around the CPU and compare with your non-working board. Don't stick the 'new' CPU into the non-working motherboard immediately; use it to collect data on the working motherboard first.

zhongzuocheng520:
Hello friend

I have a 44MXI-B fault that has not been resolved, but I have found a circuit diagram of the motherboard that is not customized. I hope it can be repaired. I hope this can help you

coromonadalix:
the mainboard is supposed to be an       BCM MX945GME-LC  Notice the LC ending, it's because of the pc104 interface,  Custom board made for LeCroy .... seen that on some threads

The best bet  would be to find a BCM MX945GME   no lecroy variant and use an pci to pc104  converter

like this ?? 
https://www.winsystems.com/product/pci-ppm/
https://connecttech.com/product/pci-to-pc104-plus-adapter/

Ans if the coin cell batterie dies on some scope, the modo settings are lost and when the board boot  youll get many errors, if you mobo still boot

And i think you are going too fast to check  this and that,  the psu is always the prime suspect,  check if you can find the psu pinouts, and normally  you are supposed to  get an always present voltage,   IE:  a 5v standby  or some rare instance an 12v

The best would be to get an Intel 945 motherboard and try on it your cpu and ram


This is a BCM  EOL warning in 2011 ???
https://www.bcmcom.com/e-ad/eletter_07282011_MX945GME_Last_Time_Buy_notice.htm                                 but i think it is the normal  version


your bet  will be to find a board who goes there, with an pc104 adapter and restart everything,   if you dont have  hidden problems elsewhere,
find the drivers  etc ....   

For a start  you should clone the drive before any attempt


If you search  BCM MX945  on fleabay,  you have some results of normal motherboards,  it could be a start  and try to build something  ou of them


The best and only one low priced 100$  is this : https://www.ebay.com/itm/255581180240?

If you search MX945  motherboards  you have more of them  starting at 50$


You are for the long run  if the motherboad is dead,  and a pci to pc104 adapter must be sold  $$

ddrl46:
A while ago I had a Lecroy 44Xi-A which wouldn't boot either with similar symptons to your unit. Turned out to be a bad RAM stick in that case.

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