MP 1,1-5,1 MP 4,1 - capacitor fell off cpu board...wont turn on

[kingvald]

Hi, really need some help here. I was going to repaste my dual cpus and Northbridge but when removing the board I noticed a capacitor loose on the tray. This is a 4,1 with a Dual CPU tray. I tried to reassemble but the machine won't turn on, just got a red flashing ovtmt CPU A and B.
The red flashing is both with and without CPUs installed.

So I guess the capacitor is important . I have tried to locate where it could be missing based on photos of a working board ...but no success, can't locate it.If anyone with experience could take a look I would really appreciate it.

I should mention that the machine works perfect with my other single cpu tray, so the problem is with the missing capacitor ...

Thanks

 

[MacNB2]

Sorry for your loss.

The images are are not hi-res enough to tell where the Cap came from.
Only you will be able to check.

Have a look in this to if it came from there:

 

[kingvald]

Thanks for having a look. Unfortunately there is not supposed to be a capacitor there .
Here are some more photos with higer res.

 

[AlexMaximus]

Zooming into the very first picture you have posted (showing the capacitor), this looks to me that the solder pad is still attached. It looks like a little plate. If this is correct, it means the solder pad got loose, not the solder. It means for your search on the PCB, not to look for a metallic shiny empty solder pad, but a dark spot, where the pad/capacitor combo used to be. If my suspicion is correct, it also means a more difficult repair, even if you find the spot, because you will need to follow the power rail where the solder pad was located and find a new spot, large enough to scrape off isolation and attach a wire to connect it which needs to be done twice for both resistor/capacitor contacts. Can you check if that is a solder pad or not?

 

[Macschrauber]

Maybe there exactly in the middle

If not check out spots you have beed touched with screws, fingernails or tools.

Most common are the holes for the northbridge rivets.

Tbh I doubt a bit that a single Missing C would prevent the board from starting. Its rather unusual. But never say nevery, anyway.

If you dont find it ignore and make 2nd test ride.

 

[MacNerd01]

That’s… bad. Yeah, your problem is probably the capacitor, but I don’t know enough about how macs are built to tell you \_(’’,)_/

 

[kingvald]

Thanks for all replies, thanx for all suggestions ... no luck so far. Spent hours comparing to photos of a working board nothing seems to be missing... very strange.....anything else that could cause the flashing OVTMP CPU ?

 

[btbeme]

 

[kingvald]

View attachment 1926414

Thanks , but no... it's a small capacitor there