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Need help repairing socket 5 PCI54PV motherboard

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First post, by castmobil

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Hello people. I am trying to repair this motherboard and I need help on what to do next .

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Only visible damage is this resistor network and once filter capacitor.
https://www.youtube.com/watch?v=Zil3W6qbSzs
I uploaded video of the sound that the motherboard is making.
When I power on the motherboard it is making buzzing sound for 2 sec 5 sec pause and 2 sec buzzing sound again.
It is making this sound with and without ram installed. Tested with 3 different types of memory that are tested on different machine.
Tested with 4 CPUS ( pentium 90 mhz )
I really want to fix this motherboard. Any help will be highly appreciated !

Reply 1 of 8, by Imperious

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Check none of those evil Tantalum capacitors are shorted, they are well known for this. I have one on an XT motherboard that stopped the power
supply from starting up.
I'd measure the resistor pack, You never know, it may be ok.

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Reply 3 of 8, by Horun

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Agree ! possibly the end two are bad seeing the damage on the top and end. Might be a simple 5 x 100, 5 x 330 or 5 x 1k or similar array for pull down/pull up.
The numbers on back side will tell (if there are any), Would be easy to cut and jump a 1/8 watt across the two pads on the end as a test once the value is known.

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Reply 4 of 8, by castmobil

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Imperious wrote on 2021-07-04, 12:56:

Check none of those evil Tantalum capacitors are shorted, they are well known for this. I have one on an XT motherboard that stopped the power
supply from starting up.
I'd measure the resistor pack, You never know, it may be ok.

Checked all the capacitor. There are no shorts. Changed the resistor network. Just bought logic probe I will try to do some more diagnostics .

Reply 6 of 8, by wiretap

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You need RAM installed in pairs, so install two memory sticks in Bank 0. (two slots closest to the PCI slots) You only have one installed in the video. Also make sure you have the correct type, as noted below. The beep code you're getting is memory error.

Getting beep codes is a good thing, since the board is showing signs of life and trying to startup. Put a POST card in the PCI or ISA slot to see what code it stops on.

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Reply 7 of 8, by castmobil

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wiretap wrote on 2021-07-05, 19:15:

You need RAM installed in pairs, so install two memory sticks in Bank 0. (two slots closest to the PCI slots) You only have one installed in the video. Also make sure you have the correct type, as noted below. The beep code you're getting is memory error.

Getting beep codes is a good thing, since the board is showing signs of life and trying to startup. Put a POST card in the PCI or ISA slot to see what code it stops on.

Thank you !!!!!
So it was the ram. It have to be FMP and in pairs. I am such a noob not paying attention to the manual.
The motherboard is alive !!! Now it is time for testing !

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