LC III Power Supply Clicking...

[Iesca]

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...

 

[agg24]

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.

 

[Iesca]

Ah, that's good to hear, I will give that a shot. And a part list would be fabulous, thank you!

 

[superjer2000]

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

 

[agg24]

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.

 

[Iesca]

Thank you, both!