VOGONS

Search

Common searches

I need help indentifying a blown IC on ABIT VH6T

Topic actions

First post, by Lynxman

Posted on 
User metadata
Rank Newbie
Rank
Newbie

I've got this Abit VH6T that I recapped and it still doesn't work. It also had a faulty BIOS ROM so I replaced that and progarmmed it but still doesn't work. After some closer inspection I found a blown IC under the BIOS IC so I suspect that's the fault. Possibly because someone inserted a BIOS backwards at some point, blowing both the BIOS IC and this IC. It looks like part of the part number may be blown off. All I can tell is F04 which may be an SN74F04 hex inverter. Does anyone have the same motherboard available to check for me? Maybe their IC has the full part number printed.

Attachments

Reply 3 of 5, by mkarcher

Posted on 
User metadata
Rank l33t
Rank
l33t
computerguy08 wrote on 2022-11-26, 10:31:

Yes, that's a 7404 hex inverter

And the "F" is likely important. The 7404 and 74F04 implement the same logic function (hex inverter), but the "F" variant is way faster. Vastly simplified, but usually good enough to understand 486 boards: You can use a 7404, a 74LS04 or a 74HC(T)04 at ISA speed, and you can use a 74ALS04, 74ACT04 or 74F04 at FSB speed.

Reply 4 of 5, by Lynxman

Posted on 
User metadata
Rank Newbie
Rank
Newbie

Thanks. I'm used to repairingolder stuff som 74hc04 is the kind of marking I expect to see.

I found an F04 on a graphics card and cannibalized it. Still no activity at all. I guess there are more blown ICs. I'm gonna remove the BIOS socket and remove the rest of the ICs to test them. It's a pain to work inside the DIP socket.

Reply 5 of 5, by computerguy08

Posted on 
User metadata
Rank Member
Rank
Member
mkarcher wrote on 2022-11-26, 19:35:
computerguy08 wrote on 2022-11-26, 10:31:

Yes, that's a 7404 hex inverter

And the "F" is likely important. The 7404 and 74F04 implement the same logic function (hex inverter), but the "F" variant is way faster. Vastly simplified, but usually good enough to understand 486 boards: You can use a 7404, a 74LS04 or a 74HC(T)04 at ISA speed, and you can use a 74ALS04, 74ACT04 or 74F04 at FSB speed.

Agree, I was just referring to the generic 74xx type of the IC. Needs to be at least the "F" type or faster so it matches the original part.

Go to top of page Go to top of page
Back to General Old Hardware
Close window
Close window