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Repairing SE/30 battery acid damage... what's on D1 and D2, and crystal speed?


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#21 olePigeon

olePigeon
  • 68LC040

Posted 06 December 2014 - 02:49 AM

I also cleaned and retinned the pads on the ROM itself.  The acid had eaten the contacts down to copper, but it took the solder just fine.



#22 techknight

techknight
  • 68LC040

Posted 07 December 2014 - 01:20 AM

The big thing is going to be patching all the dead vias/open connections. 


Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225

#23 olePigeon

olePigeon
  • 68LC040

Posted 07 December 2014 - 03:16 AM

I don't know where the hell this pad goes.  I've scratched away most of the PCB and I can't find any other trace.  Anyone have any idea?

 

d1.png



#24 unity

unity
  • 68020
  • LocationGreen Bay, WI

Posted 07 December 2014 - 03:33 AM

If its a diode, it may not go anywhere.


• Drexel Macintosh • IIcx prototypes (4) • Don Crabb's Outbound 125 • Macintosh II/x/fx • Macintosh SE/30 • Macintosh SE • Macintosh Classic II Proto • Macintosh 512k • Macintosh 128k


#25 Elfen

Elfen
  • 68030
  • LocationNYC, NY

Posted 10 December 2014 - 05:18 PM

Its a diode, part of the startup/battery/PRAM circuitry. The third pad goes nowhere.

 

oldPigeon - hope this helps:

d1-fixed.png

 

I verified it with my SE/30 board.

What worries me is all that corrosion on the chip and other areas. They can be part of the problem.


Edited by Elfen, 10 December 2014 - 05:27 PM.

Amassed a collection of various Macs and PCs that friends are calling my place a Mac museum: 512Ke, Plus, SE/30, IIcx, IIci, Q950, Q800, Q8100, 7100, Biege G3, PB 5300ce,190, 190c, 150, 180, (4) Duo 210, Duo 230, (2) 250, 280, 280c, 2300c, (3) G3 Wallstreet, iBook G3 (Orange), (3) iBook G3 (White), (3) iBook G4, PB G4 (all 12in)

 


#26 Elfen

Elfen
  • 68030
  • LocationNYC, NY

Posted 10 December 2014 - 05:41 PM

Not to Spam the board...

Managed to get a ID number off the crystal on my SE/30 board. It is: S3238E

 

Cant seem to get a frequency for it on Google. That number is linked to a lot of other things, including some part on a Lexus Automobile. Jeesh...


Amassed a collection of various Macs and PCs that friends are calling my place a Mac museum: 512Ke, Plus, SE/30, IIcx, IIci, Q950, Q800, Q8100, 7100, Biege G3, PB 5300ce,190, 190c, 150, 180, (4) Duo 210, Duo 230, (2) 250, 280, 280c, 2300c, (3) G3 Wallstreet, iBook G3 (Orange), (3) iBook G3 (White), (3) iBook G4, PB G4 (all 12in)

 


#27 olePigeon

olePigeon
  • 68LC040

Posted 10 December 2014 - 06:11 PM

My googling came up with 32.768 kHz, which is what I replaced it with.

 

Unfortunately it still doesn't boot, so I may send it to Uniserver.  I don't have the tools to check traces or anything.  I did what repairs I could based on a visual inspection.



#28 techknight

techknight
  • 68LC040

Posted 10 December 2014 - 06:21 PM

As I figured
Main PC: Intel core I7 920, MSI x58 platinum, Radeon4850
PB: tibook G4, ibook G4, ibook g3x2, Lombard, 160, 165, 180, 180c Duo 2300x2, Duo 270c x2, 520cPPC, 3400c, 1400c
Desktop: G3AIO, SE, SE/30, 512k, plus, LCIII, iMac G4, iMac intel, 6400/225




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