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Thread Tools | Display Modes |
02-03-2011, 06:43 PM
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#1 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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In no state of bliss (Bliss A-394 SFX)
I have another Bliss A-394 PSU, like the one here, but it has a proble. when I attampt to power it on, it briefly starts and shuts off, like there is a short. I've already checked the shcottkys and none of them seem shorted. Any ideas?
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02-03-2011, 09:17 PM
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#2 |
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Super Moderator
Join Date: Nov 2008
City & State: New Albany, IN
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Student Tech
Posts: 10,783
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Re: In no state of bliss (Bliss A-394 SFX)
shorted bad cap?
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02-03-2011, 09:54 PM
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#3 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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Re: In no state of bliss (Bliss A-394 SFX)
No, a re-cap with some nice new pannies and samxons doesn't help. I'm wondering whether it could be a faulty protection which is shutting it down even though there is really nothing wrong.
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02-04-2011, 01:14 AM
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#4 |
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Super Moderator
Join Date: Nov 2008
City & State: New Albany, IN
My Country: USA
Line Voltage: 120VAC 60Hz
I'm a: Student Tech
Posts: 10,783
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Re: In no state of bliss (Bliss A-394 SFX)
make sure there are no solder bridges. especially around where you recapped.
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02-04-2011, 03:20 AM
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#5 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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Re: In no state of bliss (Bliss A-394 SFX)
Can't find any. I tested all the rails for shorts to ground and to other rails with the DMM and couldn't find any
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02-04-2011, 04:11 AM
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#6 |
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Badcaps Veteran
Join Date: Oct 2009
City & State: Thessalonik
My Country: Greece
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Posts: 1,054
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Re: In no state of bliss (Bliss A-394 SFX)
I have some power supplies that start and stop instantly if they don't have at least a cd-rom/hard drive and some fans connected to them.
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02-04-2011, 07:54 PM
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#7 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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Re: In no state of bliss (Bliss A-394 SFX)
Tried it with more load too. Makes no difference.
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02-05-2011, 06:43 PM
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#8 |
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Member
Join Date: Jul 2008
City & State: Toowoomba/Rockhampton
Posts: 26
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Re: In no state of bliss (Bliss A-394 SFX)
What IC does this use? You can monitor the protection pins with an analogue meter.
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02-05-2011, 07:01 PM
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#9 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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Re: In no state of bliss (Bliss A-394 SFX)
It's a Weltrend WT7510. The datasheet is only 1 page long and not very helpful.
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02-05-2011, 07:41 PM
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#10 |
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Banned
Join Date: Aug 2007
Posts: 45
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Re: In no state of bliss (Bliss A-394 SFX)
As of this writing, first Google result for WT7510 returns a datasheet with quite a bit more than 1 page...
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02-05-2011, 07:55 PM
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#11 |
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Badcaps Veteran
Join Date: Oct 2009
City & State: Thessalonik
My Country: Greece
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Re: In no state of bliss (Bliss A-394 SFX)
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02-05-2011, 11:59 PM
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#12 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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Re: In no state of bliss (Bliss A-394 SFX)
Thanks for the datasheet. I checked the voltages on the pins with the PSU on standby. Connecting one pin of the DMM to ground, pin 3 (FPL_N) had 4.26v, pin 4 (PDON_N) had 2.52v and pin 7 (VCC) had 4.53v. All others had 0
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02-08-2011, 12:36 AM
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#13 |
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Unknown
Join Date: Sep 2009
City & State: North Coast, NSW
My Country: Australia
Line Voltage: 240V 50Hz
I'm a: Professional Tech
Posts: 3,371
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Re: In no state of bliss (Bliss A-394 SFX)
I treid replacing the secondary schottkys and it ran for about 5 seconds, then there was a "tick" and it died again. Same problem where you only get the quick fan twitch.
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