68kMLA Classic Interface
This is a version of the 68kMLA forums for viewing on your favorite old mac. Visitors on modern platforms may prefer the main site.
| Click here to select a new forum. | | LC III Power Supply Clicking... | Posted by: Iesca on 2019-02-15 13:39:12
Well, no sooner than my 540's power supply went caput, I now discovered that my LC III won't startup either, and instead just clicks. Apparently this is a pretty common issue, and I guess it can sometimes be resolved temporarily by applying hot air to the affected area?
Grumble frumble...
| Posted by: agg24 on 2019-02-17 11:09:17
Yes, hot air does work a lot of the time. If that fixes it, you need to do a simple recap. If you're interested, I can send you a part list for easy ordering from Mouser.
| Posted by: Iesca on 2019-02-17 14:24:54
Ah, that's good to hear, I will give that a shot. And a part list would be fabulous, thank you!
| Posted by: superjer2000 on 2019-02-18 09:12:52
Ah, that's good to hear, I will give that a shot. And a part list would be fabulous, thank you! Attached is the list of caps I ordered (and used) for the three different types of LC PSUs that I had in my collection of LCs. (Astec, TDK and Dynacomp (which was a new one for me).
I've recapped about 9 units with this list and haven't had any issues. The clearance for the big filter cap is a bit tight height-wise for one of them, but everything still went together perfectly fine.
View attachment Mac LC PSUs Distribution.xlsx
| Posted by: agg24 on 2019-02-18 15:05:26
Here's what I ordered and some relevant information.
Maccaps
PSU Voltages
All caps are radial through hole.
Core:
- 1x 270uF 10V 6.3mm diameter 11.2mm length
- 2x 270uF 25V 10mm diameter 12.5mm length
- 1x 56uF 25V 5mm diameter 15mm length
Secondary (as per 68kmla):
- 3x 1000uF 10V 10mm diameter 16mm length
- 1x 47uF 25V 5mm diameter 11mm length
- 1x 10uF 50V (replaces C8 at 8.2uF 50V) 5mm diameter 11mm length
Please note that I have not actually managed to get my PSU to work, though it remains to be seen whether it's a PSU or a logic board issue. For me, the fan spins and the speaker clicks every second or so, in time with the PSU clicking.
| Posted by: Iesca on 2019-02-18 22:29:11
Thank you, both!
| | 1 |
|