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LeCroy WaveSurfer 24MXs-B Motherboard

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tppc:
good point!
no I did'nt clear the BIOS, nor did I connect a PS/2 Keyboard.

I'm returning to the lab!

I'll be back ;D

tppc:

--- Quote from: Martin72 on May 08, 2022, 09:53:47 pm ---Is it a constant value ?
Minus of the cap is connected to common GND ?
Than you can measure the ATX connector against GND, maybe you find the 8 Ohms on one of the pins.
Additional:
Take off CPU and RAM and measure the suspicious points again...

--- End quote ---

OK, I'm going downstairs to check this too  ;D

tppc:
OK, I tested all your good ideas  :)

PS/2 Keyboard : Leds brieflly light up at power on but then no reaction to Caps lock/Num Lock
BIOS clear : no improvement.

Cap minus is connected to GND.
could not measure 8 Ohms on any pin of the ATX Connector.
Removed RAM + CPU, still measures 8 Ohms (constant) across the cap/rail

Looks like the damage is on the board, not the RAM nor the CPU.
Next step will be to test/unsolder tantalums and ceramic caps.

tppc:

--- Quote from: free_electron on May 08, 2022, 09:47:17 pm ---https://www.ebay.com/itm/362087872172


--- End quote ---
Hi,
thanks for the link, but this one misses the PC104 interface.
Thanks anyway.

tppc:
Hi there,
just an update.

I lifted all tantalum caps + all mosfets on the mainboard.
none of them tested bad :(

And still this suspicious constant 8 Ohms measured over a large part of the capacitors on the board.

I don't think I can repair it.

Regards.

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