genel
Windows User
C= 64 NTSC, PAL, SX, 128 (Flat) Sony monitor capable of all standards, also 80 columns.
Posts: 4
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Post by genel on Mar 31, 2016 0:48:49 GMT
I used to work as a computer power supply tech way back when. We didn't see many problems with smaller caps, but the large electrolytics were another thing. The usual problem from the production line is they would connect a cap backwards, a 100,000 mfd cap at 25 vdc blowing is a sight to behold. They create a huge white "mushroom cloud" of electrolyte out the bottom of the safety vent when they blow. As a joke, I once connected a 100,000 mfd cap to a line cord, and plugged it in another tech's power strip. When he came in, and turned it on, it made a whooshing sound, and completely enveloped him and his test bench in the cloud. He came out of it hacking and coughing! No-one ever told him who did it, and he didn't guess me.
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genel
Windows User
C= 64 NTSC, PAL, SX, 128 (Flat) Sony monitor capable of all standards, also 80 columns.
Posts: 4
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Post by genel on Mar 26, 2016 15:47:47 GMT
I got a Partner 128 cart recently with a bunch of 128 stuff. I have no idea what it is or does. Can anyone provide a link?
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genel
Windows User
C= 64 NTSC, PAL, SX, 128 (Flat) Sony monitor capable of all standards, also 80 columns.
Posts: 4
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Post by genel on Mar 14, 2016 13:14:59 GMT
Interesting... in my experience, capacitors don't normally "blow up", the usually just "fade away". Usually when a cap "blows up" it is because of something else... either a power surge, or a shorted diode/transistor. If replacing the cap makes it work, then you got lucky (no shorted diode/transistor). Anyway, glad to hear you were successful in "restoring" all 3 of your PSUs! [Edit]
The only bad C128 PSU that I've had so far (knock-on-wood), simply had a cracked circuit board. Soldering a few jumper wires over the cracks fixed it. The only PSU that I ever had to rebuild was for a PlayStation (I think it got fried by a power surge). Just my experience... I hear people in 220V countries have more trouble with PSUs... [/Edit]Ok, I didn't literally mean "blown up". The cap had overheated, and the shrink tubing with nomenclature had shrunk. (However, I have seen caps blow, with the guts blown out of the bottom.) Anyhow, now I will do a recap of the 128 itself.
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genel
Windows User
C= 64 NTSC, PAL, SX, 128 (Flat) Sony monitor capable of all standards, also 80 columns.
Posts: 4
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Post by genel on Mar 2, 2016 14:01:02 GMT
I have three flat 128's, and use one for powering my 128's and my PAL 64.
I noticed recently that I was getting very random video flashing on both computers.
I got suspicious so I took it apart. One blown lytic cap.
Long story short, I recapped all three power supplies, and renewed the old heatsink compound.
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