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Sun Cheer PSU

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First post, by candle_86

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As requested, Pictures.

It has a leaking cap, and a buldged cap I will learn to solder if yall think its worth it.

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Sun Cheer 400W
Model SC-400

Reply 1 of 8, by Imperious

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Of course it's worth it, power supplies like that are fine for older retro systems.

I recently replaced bulged capacitors in a L&C 450W and a 330W Antec that I bought second hand. I reckon most older PSU's
around the 15 year old mark will need some caps replaced.
You may have to remove a few of those capacitors at a time as they look like they glued together at the top. You can try to
prise the glue off, but if you damage any of them You will have to replace them.

There are plenty of guides on Youtube about soldering, replacing caps, etc.

Atari 2600, TI994a, Vic20, c64, ZX Spectrum 128, Amstrad CPC464, Atari 65XE, Commodore Plus/4, Amiga 500
PC's from XT 8088, 486, Pentium MMX, K6, Athlon, P3, P4, 775, to current Ryzen 5600x.

Reply 2 of 8, by candle_86

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by worth it I meant more does the unit look like it could be a quality unit by recapping it.

Reply 3 of 8, by gdjacobs

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It looks more complete than a gutless wonder. Sometimes vendors will rebadge adequate power supplies with a bogus power rating. To know for sure, we would need to determine the current carrying capacity of the bridge rectifier, switching transistors, and main transformer. Also, it's difficult to inventory the components of the input filter based on the above photos.

Those caps should all be replaced, though. Fujhyyu (aka F-You) caps are absolute trash.

All hail the Great Capacitor Brand Finder

Reply 4 of 8, by candle_86

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gdjacobs wrote:

It looks more complete than a gutless wonder. Sometimes vendors will rebadge adequate power supplies with a bogus power rating. To know for sure, we would need to determine the current carrying capacity of the bridge rectifier, switching transistors, and main transformer. Also, it's difficult to inventory the components of the input filter based on the above photos.

Those caps should all be replaced, though. Fujhyyu (aka F-You) caps are absolute trash.

So disassemble and take more pictures?

And I know about the gutless wonders, right now the system is using a Logysis 430W which on the little label says 320W normal in tiny tiny print, it also weigh's less a mouse pad.

What kind of Caps should I order for this, brand wise. This will be the first time I've ever recapped anything, my experince prior is with replacing the DC Jacks on laptops so I hope its similar.

Reply 5 of 8, by Imperious

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Plenty of tutorials on Youtube for replacing caps in computer power supplies.

https://www.youtube.com/watch?v=nhtucOTQVdU

Your PSU looks like a typical early to mid 2000's unit for an average system, just don't try running it on a heavy duty
game system or with a Prescott cpu and Nvidia 78xx or ATI X800 series video cards and higher.

Atari 2600, TI994a, Vic20, c64, ZX Spectrum 128, Amstrad CPC464, Atari 65XE, Commodore Plus/4, Amiga 500
PC's from XT 8088, 486, Pentium MMX, K6, Athlon, P3, P4, 775, to current Ryzen 5600x.

Reply 6 of 8, by gdjacobs

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candle_86 wrote:

So disassemble and take more pictures?

Nah. You might be able to get a better angle on the input filter which will tell you how well downstream equipment is protected from line voltage transients. If you want to try to read the silk screening on the mosfets, the bridge, and the transformer, we'll be able to determine the true power capability of the supply. If you're going to use the supply very conservatively, you don't have to have this level of concern.

candle_86 wrote:

And I know about the gutless wonders, right now the system is using a Logysis 430W which on the little label says 320W normal in tiny tiny print, it also weigh's less a mouse pad.

What kind of Caps should I order for this, brand wise. This will be the first time I've ever recapped anything, my experince prior is with replacing the DC Jacks on laptops so I hope its similar.

Panasonic, Nippon Chemi Con, Rubycon, Nichicon, Suncon (Sanyo). All top tier.

All hail the Great Capacitor Brand Finder

Reply 7 of 8, by ODwilly

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I would suggest posting this in the PSU thread, as it is more likely to be noticed by the forum PSU guru's 😀

Main pc: Asus ROG 17. R9 5900HX, RTX 3070m, 16gb ddr4 3200, 1tb NVME.
Retro PC: Soyo P4S Dragon, 3gb ddr 266, 120gb Maxtor, Geforce Fx 5950 Ultra, SB Live! 5.1

Reply 8 of 8, by candle_86

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Imperious wrote:
Plenty of tutorials on Youtube for replacing caps in computer power supplies. […]
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Plenty of tutorials on Youtube for replacing caps in computer power supplies.

https://www.youtube.com/watch?v=nhtucOTQVdU

Your PSU looks like a typical early to mid 2000's unit for an average system, just don't try running it on a heavy duty
game system or with a Prescott cpu and Nvidia 78xx or ATI X800 series video cards and higher.

it will power an XP 2500, FX 5900