Need help with 20" iMac (iSight) logic board

[poobah]

Got a 20" iMac (iSight) on the bench that doesn't power up. Found a toasted 8 pin chip on the board near the power connector (silkscreen UE300, see pic). Alas, it is too far gone to read off the part number.
I'd appreciate if anyone could tell me what it is, send me a pic of the area, or just copy off the numbers for me so I can fix the old girl up.
Thanks!

[NxB]

Re: Need help with 20" iMac (iSight) logic board

It looks like an eeprom or a 4 pin mosfet.

[Alidor]

Re: Need help with 20" iMac (iSight) logic board

On mine it says: 2024, 57M, AD7J


Meanwhile, way over on the other side - any idea what *this* little fellah was? I can almost make out: F7807z... Is that right?
It's right beside a F7805z but I can see a 7 at the end. (It's the umop-ep!sdn one)

Thanks,

Alidor

[Toasty]

Re: Need help with 20" iMac (iSight) logic board

Your best chance is to get a working unit off eBay or Craigslist and swap the board. You do not know what has happened to destroy these chips and finding a replacement is nigh impossible. Even finding a correct replacement could end in the same results without knowing the root cause.

Cross references yield nothing and datasheet searches even less.

The chip(s) may be as common as anything, but it's likely marked with a "house number" by TI that will render it useless to anyone but them and Apple's board manufacturer.

Happy Hunting!
Toast

[Alidor]

Re: Need help with 20" iMac (iSight) logic board

Hey it might be this thing. It's meant for hot plugging applications.
It *is* near the usb/firewire/audio ports...
https://cdn.badcaps-static.com/pdfs/...b9590afcbb.pdf

[Toasty]

Re: Need help with 20" iMac (iSight) logic board

I think you are correct. Pins 6,7, & 8 are tied together as are pins 2 & 3. A very likely candidate.

Digikey & Newark are non-stocked. Mouser has them on order due end of April. They currently have them in DIP packaging, not the SOIC you need.

Nice job!