18 Pin motherboard needs new PSU

by **90Ninety** » July 23rd, 2011, 4:50 am

Right, basically My system has an 18 Pin PSU which is faulty and irreplaceable , they are discontinued
so I decided to buy a replacement small form factor PSU from Ebay , which fits snugly , however it has a more common 20 pin mobo connector
So I cut off the old 18 pin connector and spliced it to the new PSU . I noticed the original PSU has most of the standard colour wires found on most PSU's . I did double up on the extra red and black wires .
I noticed the old PSu and connector had a 3.3 v brown sensing wire , which the new PSU didnt have , so I left it unconnected
Also the New PSU has a blue wire , which the motherboard connector doesn't have

Everything else I connected up , the hard drive , 4 pin CPU and 4 Pin Monitor ( though had to split one yellow wire for the monitor as I run out )

I will post up some pictures , generally I have just matched up most of the colours and this has worked for someone else who has posted here http://www.bearware.co.uk/2011/02/03/sony-vgc-m1-psu-fix/

Seems like these 18 Pin PSU are common on Vaio All-in one Series desktops

by **shovenose** » July 23rd, 2011, 7:51 am

That's pretty neat! Nice job on the useful hack

by **90Ninety** » July 23rd, 2011, 11:43 am

Well I forgot to mention , the computer doesn't fire up . I havent yet got it to work . In theory it should .

Any Ideas what I'm doing wrong , or what needs to be done?

Will post up pictures soon

Would be really usefull If I can get it to work

by **90Ninety** » July 23rd, 2011, 2:10 pm

Here's the old PSU, I cut off the 18 Pin connector, along with around 7 inches of wire
[img][IMG]http://i152.photobucket.com/albums/s187/Joe90_photo/PSU%20upgrade%20for%20Sony%20Vaio%20VGC-VA1/P1010962.jpg[/img]http://[/img]

Here's the Label from the Old PSU [img][IMG]http://i152.photobucket.com/albums/s187/Joe90_photo/PSU%20upgrade%20for%20Sony%20Vaio%20VGC-VA1/P1010971.jpg[/img][/img]

Here's the splicing I had done with a new PSU and the New PSU Label[img][IMG]http://i152.photobucket.com/albums/s187/Joe90_photo/PSU%20upgrade%20for%20Sony%20Vaio%20VGC-VA1/P1010981.jpg[/img][/img]
[img][IMG]http://i152.photobucket.com/albums/s187/Joe90_photo/PSU%20upgrade%20for%20Sony%20Vaio%20VGC-VA1/P1010980.jpg[/img][/img]

Here's the New PSU all wired up and sliced onto connectors

Here's a picture of the spliced mobo conector , connected and the CPU connected . Note the spare brown wire from the old PSU , on the connector

[img][IMG]http://i152.photobucket.com/albums/s187/Joe90_photo/PSU%20upgrade%20for%20Sony%20Vaio%20VGC-VA1/P1010986.jpg[/img][/img][/align]

Here's a picture of the new spliced PSU on my system , Still doesn't work . You can see the spare blue wire form the PSU . And you can also see the Spare brown wire from the connector , again .[img][IMG]http://i152.photobucket.com/albums/s187/Joe90_photo/PSU%20upgrade%20for%20Sony%20Vaio%20VGC-VA1/P1010993.jpg[/img][/img][hr]
Bump

Still cant get her to power up , any idea why??

by **shovenose** » July 23rd, 2011, 3:23 pm

The new psu only has 5 amps on the +12v rail!!! That is the problem!

by **Th3_uN1Qu3** » July 23rd, 2011, 4:35 pm

Yes, basically that PSU you bought can't power anything more substantial than a Pentium III... Or a really low-end C2D chip with onboard video. The blue wire is -12v for what it's worth, it is hardly ever used anymore but it is still kept in the latest ATX standard (-5v, white wire, was dropped a few years ago).

by **shovenose** » July 23rd, 2011, 4:41 pm

Not even a Pentium III unless you've got a single very power efficient hard disk.
Lol.
I would recommend at least 15A on the +12V rail.

by **c_hegge** » July 23rd, 2011, 6:58 pm

- When you say it doesn't fire up, do you mean it doesn't power on, or it doesn't POST?
- Could your other PSU have taken the boartd with it when it died (unlikely with a delta, but possible)?