One more cheapy psu with +5vsb output only

[stefos]

Re: One more cheapy psu with +5vsb output only

1. Remove those three Connections From PCB . [Shown in "SS-03"]

2. Then Connect those Two Pins with a Jumper . [Shown in "SS-03"]

Lets see what happens ....

Tried this testing connections and got +14.83v output, +4.53v, -4.107v.

While -12v output voltage fixed in inductor the ouput after diode became -16.50v so the blue cable output was -16.50v too

Also +12v output voltage went from +12.80v to ~14.80v and with HD load the PG led went off on psu tester.

[Escort Eagle]

Re: One more cheapy psu with +5vsb output only

Use a LM7912 Negative Regulator . If it works then well, otherwise keep it for using it's Parts .

[Escort Eagle]

Re: One more cheapy psu with +5vsb output only

Your advice was helpful, because I have noticed that thinner wire was first in place. I soldered again in correct (I hope this time) sequence and I got back -12v in inductor -12v output. Unfortunately when I add HD load PG light went off in my pSU tester.

You should give another try by Replacing +5VSB resistor From 22.11K to 1K . I think PG will be OK at Load time !!

[Escort Eagle]

Re: One more cheapy psu with +5vsb output only

I have replace Inductor Just one time . So, I did not observe about the thickness of Inductor . Just Now I have watched the thickness as follows :

1. +5V is the most thicker . (Some PSU used Double wire)

2. +3.3V and +12V are almost same . (Some PSU used +3.3V more thicker wire than +12V. But Old PSU used +12V thicker wire than +3.3V)

3. -12V is less thicker than above other .

4. -5V is the Lowest thicker than all other wires .

[stefos]

Re: One more cheapy psu with +5vsb output only

Use a LM7912 Negative Regulator . If it works then well, otherwise keep it for using it's Parts .

Incase i get in LM7912 regulator, where should be connected?

[stefos]

Re: One more cheapy psu with +5vsb output only

I have replace Inductor Just one time . So, I did not observe about the thickness of Inductor . Just Now I have watched the thickness as follows :

1. +5V is the most thicker . (Some PSU used Double wire)

2. +3.3V and +12V are almost same . (Some PSU used +3.3V more thicker wire than +12V. But Old PSU used +12V thicker wire than +3.3V)

3. -12V is less thicker than above other .

4. -5V is the Lowest thicker than all other wires .

This inductor has 4 same thick wires (2 red and 2 gold) and 1 less thicker red wire.

I have soldered with that sequence : +12v(red), -12v(red), -5v(gold), +5v(gold) together with +5v(red less thicker). In opposite order -12v inductor's input and output is almost 19v. So the first order must be the right one for this inductor. But it is not fully compatible with original transformer.

I'll keep it for later use in case I find another inductor switable for this psu.

Otherwise I' ll use the parts in other repairs.

Thanks

[Escort Eagle]

Re: One more cheapy psu with +5vsb output only

Yes, It is better decision to stop working with this PSU now . Because without Proper Inductor you can not fix the Voltage problem .

Incase i get in LM7912 regulator, where should be connected?

I have attached the Datasheet of LM7912 . You will easily understand How and Where to be connected the Regulator by watching the Datasheet .

My advice is - Keep This PSU for later time or use it's parts to repair other Damaged Power supply .