Re: Cheap PSU: Piece of junk or semi-decent?
Please keep in mind this PSU is to power a ~1999-vintage i440BX mobo with ISA sound card ...
Please keep in mind this PSU is to power a ~1999-vintage i440BX mobo with ISA sound card ...
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Re: Cheap PSU: Piece of junk or semi-decent?
Sure, I count on you repairing it. You don't want to let there shorted caps to set your balls on fire, right?
Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
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Re: Cheap PSU: Piece of junk or semi-decent?
I just mean -5V and -12V could be relevant to this ancient hardware.Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
Well, pull out the isa card and see if the pins for -5v and -12v go somewhere on the sound card.
Pinout is this : http://pinouts.ru/Slots/ISA_pinout.shtml
B5 -5VDC -5 VDC
B7 -12VDC -12 VDC
B is the pins on the back side, the one that's usually without components. B1 is the pin closest to the back of pc.
Just because the slot has provisions for it, doesn't mean the card actually has to use them.
If you want just put a 100uF or better capacitor on that -5v line ... use 10v rated capacitor or higher. There's really not that much current that you HAVE to use 470uF.Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
If i were to go with one of those two, i'd use the Koshin.A working TV? How boring!Originally posted by PeteS in CAComment
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Re: Cheap PSU: Piece of junk or semi-decent?
Choyo is so bad that you should trash them.....
Koshin is also too bad.... Maybe scavenge caps from somewhere else and use them there?Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
It looks like one lead was torn out of one of the Choyo caps.
Try to find some better caps. If you find a 10V or 6.3V cap, you should be able to use it for -5V.Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
The poor cap pissed himself from the trauma.
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Re: Cheap PSU: Piece of junk or semi-decent?
IT'S ALIVE!
Rotated the -5V Ruby 180 degrees, planted back a Koshin for -12V ...
... and The Thing breaths!
No thermobaric explosions, no dimensional rifts!
And with a couple fans plugged to the Molex sucking some +12V I get these pretty coherent voltage readings :
+12V: 11.80
+5V: 5.11
+3.3V: 3.32
-12V: -11.45
-5V: -4.77Attached Filesif you find these attachements useful please consider making a small donation to the site
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Re: Cheap PSU: Piece of junk or semi-decent?
Overkill!
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Re: Cheap PSU: Piece of junk or semi-decent?
That wire above the rectifier heatsink with so much uninsulated copper would worry me, don't like it at all.
Yeah, it's probably ok, you close the case and the wire doesn't move anywhere, and the rectifier is still passivated glass, insulated, so not much concern... these things just irk me.
Other than that, really overkill but somewhat nice at the same time. Good job!Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
I would recommed putting a grille on the outward facing fan. Turning the supply off by blindly reaching behind for the power switch could prove startling.Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
I thought he was going to put a grille there later....Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
I think you are right, I must insulate that wire better.
The front fan definitely needs a grille, as it could catch some internal PC wiring. But the exhaust one can live without, and we regain a bit of volumetric efficiency. PC fans aren't really dangerous, I stop them routinely with my fingertips when testing for noise sources.Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
I would be more worried about breaking your fingers You can replace fan, but finger… But I usually don't add any grill, ppl are told to not touch that area at all 
Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
I've never had an ordinary computer fan take out a finger.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
Yeaah, I didn't mean cutting it of, but if you get cut badly, the you are crippled for some time. At least I cannot do many thing with injured fingers
Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
Exclusive caps, meters and more!Hardware Insights - power supply reviews and more!Comment
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Re: Cheap PSU: Piece of junk or semi-decent?
I've never had an ordinary computer fan injure my finger.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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can anyone tell whether ive knackered this from the photos. In relation to black piece of something that appears to left in component in image with 156 at the end ?...05-11-2025, 05:13 PM -
daxktdmb8c0
Maybe someone has a photo of a section of the board, otherwise there are no diagrams or boardview... -
Hi Everyone,
I was hoping some kind individual could provide a copy of the bios bin file for this desktop computer. I have a CH341A eprom burner. I managed to read the file and copy it back again, however, this did not fix it. The computer powers up but won't boot so the bios update program is of no use to me.
The full details of the particular model are: Compaq Presario CQ3430AN
I am attempting to repair this piece of junk for a friend of mine.
I told my friend to NEVER buy such a piece of junk in the future. HP Compaq support is virtually... -
I have a Vizio M43-C1 stuck in a reboot loop with no backlight.
I've tested all the voltage rails coming out of the power supply and they are "normal" for this model (PS_ON & DIM go high when turned on, BL_ON & 3D_ON are close to zero due to backlight power flowing through the mainboard, 5VSB is 5V, and 12V is 19V, which is apparently normal for this board).
Basically, I get similar results to Garry in this post: https://www.badcaps.net/forum/showthread.php?t=80346
So, I've ruled out the PSU for now.
The reboot loop... -
So the 16v 1500uF capacitor C9B1 near the power connector on the back of a Phat started leaking. Haven't been able to find the right cap, so I replaced it with a larger 25v 2200uF capacitor a couple weeks ago and everything is working fine since then. I didn't replace the other six 16v caps, they were all good.
When putting the fan plastic cover back I remember there were maybe 2-3 mm of clearance on top of it and 1-2 mm of clearance to the side of it.
For those that don't remember what the fan cover looks like I found this picture https://cdn.quade.co/wp-content/uploads/2...
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