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| LC575 caps continuity check. |
Posted by: glay78 on 2021-11-05 21:29:04
Can anyone help here since I can’t get a schematics on the net.
LC575
Caps C11 negative is connected to C8 negative? |
Posted by: Bama on 2021-12-07 15:28:08
Can anyone help here since I can’t get a schematics on the net.
LC575
Caps C11 negative is connected to C8 negative? I have continuity between those two points on mine. |
Posted by: glay78 on 2021-12-08 06:23:40
I have continuity between those two points on mine. Yup! Thank you. Now I don’t know which is wrong then. I mean the other caps continuity |
Posted by: Bama on 2021-12-13 07:33:51
Yup! Thank you. Now I don’t know which is wrong then. I mean the other caps continuity Which other caps are you investigating? |
Posted by: glay78 on 2021-12-17 07:51:15
Which other caps are you investigating? I’m actually out of idea. |
Posted by: Bama on 2021-12-19 10:00:47
I have a couple of LC575’s MB’s that I am trying resurrect.
One gave nothing before recap and now gives gives death chimes after recap and second was working before recap and now after recap does NOTHING! Ugh! |
Posted by: Bama on 2021-12-20 14:34:21
For what it’s worth:
When I placed my multimeter lead on each end of the capacitor (+/-) I discovered several of my newly placed tantalum capacitors appeared to be shorted. I logged the resistance reading for each suspect capacitor. (If a capacitor is not listed below, then the reading was either Kilo or MegaOhm range.)
| Location | Initial Resistance following initial recap | Resistance following second recap
and solder mask | | C2 | 0.1 Ohm | Mega Ohms | | C8 | 0.2 Ohm | 2,200 Ohms | | C12 | 3.5 Ohms | 1,300 Ohms | | C13 | 33 Ohms | 1,300 Ohms | | C15 | 0.1 Ohm | 1,300 Ohms | | C17 | 0.2 Ohm | Mega Ohms | | C28 | 0.2 Ohm | 1,300 Ohms |
After removing the newly placed caps, I was very meticulous applying solder mask around the solder pads to prevent inadvertent short circuits.
Happy News, I now have a working LC575 logic board!
Now time to figure out out how to repair the shattered plastics.
— BAMA |
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