Hot When Powered Off

General information to do with the PlayStation 1 Hardware. Including modchips, pinouts, rare or obscure development equipment, etc.
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ellison
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Hot When Powered Off

Post by ellison » September 22nd, 2016, 1:08 am

I have a 5501 I just got off ebay and I'm just getting reacquainted with the PlayStation. When it's not in operation and plugged in, it stays fairly hot. Unplugged, the bottom of the case on the power side was 75 degrees Fahrenheit, and after ten minutes of being plugged in it went to 84 degrees. Does anyone else have this happen, or is something wrong here?

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Re: Hot When Powered Off

Post by nocash » September 22nd, 2016, 7:49 am

84'F is around 30'C isn't it? That's not really hot, and that's normal (unfortunately). All Playstations are fitted with fake Power switches that can only disable the supply's DC output, but not the AC input. So the power supply will be always quite warm and waste a good bit of energy.

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Re: Hot When Powered Off

Post by ~PSXLoVeR95~ » September 22nd, 2016, 11:05 am

Agree with Nocash.
Expecially the 100x series. The PSU and the modbo are a little be hot when are OFF. The important is fully functioning ^^!
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Re: Hot When Powered Off

Post by Shadow » September 22nd, 2016, 1:31 pm

Yeah, it's normal. It stays warm all the time, even when the I/O button is OFF.
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Re: Hot When Powered Off

Post by ellison » September 22nd, 2016, 6:52 pm

Okay. Thanks for the replies, guys. I installed a switch on the AC cord from a lamp power cord like this.

http://bplampsupply.com/images/products ... _alt_0.jpg

Now I don't have to keep it unplugged to not waste power.
Last edited by ellison on September 22nd, 2016, 10:03 pm, edited 2 times in total.

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Re: Hot When Powered Off

Post by likeabaus » September 22nd, 2016, 8:15 pm

nocash wrote:84'F is around 30'C isn't it? That's not really hot, and that's normal (unfortunately). All Playstations are fitted with fake Power switches that can only disable the supply's DC output, but not the AC input. So the power supply will be always quite warm and waste a good bit of energy.
Wow, that's the first I've heard of this. I've never noticed any psx/psone/ps1 I've owned getting warm while switched off. I guess I'm not very observant lol. Good to know though, cause normally if someone didn't know this, I would assume there's an issue with the power supply... Guess its just an engineering fail XD
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Re: Hot When Powered Off

Post by Shadow » September 22nd, 2016, 9:23 pm

Typically they'd have a relay which would enable when the power button is pressed, much like a plasma TV. Problem is, it'd add to the cost of the machine which I guess wasn't Sony's intention on doing, or it could just be a design choice. The power supply in the PSX is actually overall really well designed :)
Development Console: SCPH-5502 with 8MB RAM, MM3 Modchip, PAL 60 Colour Modification (for NTSC), PSIO Switch Board, DB-9 breakout headers for both RGB and Serial output and an Xplorer with CAETLA 0.34.

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