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LC575 C2/C5 Capacitor Question

superjer2000

Well-known member
I removed the caps from the logic board of the LC575 I just bought. Before soldering on new caps, I always like to check to ensure that the pads have continuity somewhere else on the board to see if I have to do any jumpering.

The positive leg of C5 and C20 are connected and then C2 connects to a via that goes to the back side of the board. That via must connect to a middle layer in the board as you can't see any traces on either side. I have buzzed the pins of all nearby components and I just can't figure out what the positive side of C5 and C2 connects go (or my trace is broken). Would somebody mind using their continuity checker to see what

C5/C2 should connect to?

 

superjer2000

Well-known member
The pads in the yellow square (on the front side of the logic board) are the ones I'm referring to. They are connected to each other and to the via I have circled in the picture (front side). 

That via goes to the back of the board (circled in the next picture-back of the board). The via contact looks a little worse for wear - that's just from my multimeter probe.LC575-Front-A.jpgLC575-Back-B.jpg

Based on the very similar color classic logic board, I think that there should be a connection between the C2/C5 + pads on the front to a resistor on the back of the board which would then connect to the chip (noted with the arrow) on the front side of the board.

I'm hoping somebody can slide out their 575 board and check what that via should connect to by dragging the other probe of their multimeter across the resistors on the back of the board highlighted in the orange square. Any help on this is appreciated!! THANKS!

 

superjer2000

Well-known member
Bump...  Still hoping somebody can confirm what the positive pads of C2/C5 on the above LC575 board revision connect to...

 
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