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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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