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ASUS P2B - Dead Voltage Regulator

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First post, by PKFreeZZy

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Heya,

Tried to assemble my ASUS P2B test system after moving out... it went horribly. It started having issues with powering on even before we had relocated, but it would still eventually POST and boot into Windows.

This time it ended with a bang, killing what I assume is the voltage regulator, the chip in the bottom right corner of the board.

IMG_20231122_111452.jpg?ex=657049c9&is=655dd4c9&hm=4ba02561d386eb173f302a69d03daef93b50ec274416c5ae320210ec89fb228d&=&format=webp&width=813&height=610

It still powers on, but nothing else happens. Anyone know the part number or a similar (perhaps even more reliable) chip I can use to replace it?

My Windows 98 PC: Slot 1 Pentium III 600 (Katmai) | 256MB PC133 SDRAM | 64MB Leadtek WinFast GeForce2 Pro | Creative SB16 CT2230 | Intel PRO/100+ with Alert on LAN* | 18.64GB Seagate ST320011A | Corsair CX430 | ASUS P2B Rev. 1.04

Reply 2 of 4, by Horun

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If it was having issues before the bang then either bad board caps or failing PSU or both. Have you tried a different PSU ? iirc the AS97127F is an ASIC for thermal monitoring, front panel and fan control.
If it got fried then the board will halt at a certain BIOS point because it cannot get signals from it. Do you have a PCI DIAG card ?

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 3 of 4, by PKFreeZZy

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Ah, looks like I'm out of luck for the time being; no other PSU to test or PCI diag card. Thank you both for the info and suggestions! I'll return to the resurrection of this board at a more convenient time.

My Windows 98 PC: Slot 1 Pentium III 600 (Katmai) | 256MB PC133 SDRAM | 64MB Leadtek WinFast GeForce2 Pro | Creative SB16 CT2230 | Intel PRO/100+ with Alert on LAN* | 18.64GB Seagate ST320011A | Corsair CX430 | ASUS P2B Rev. 1.04

Reply 4 of 4, by Horun

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Ok. If you have a good Digi meter you can check the volts on the current PSU, they need be within 10% or better on DC volts connected to the board and you can check ripple to a degree using the AC setting.
If you get a Diag card it will help figure out if the board is worth fixing, but there is no replacement for that Asus labeled ASIC afaik....do not think anyone ever figured out who really made it..

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

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