Echostar 680W power good 0V

[miligor]

Now is it really 680W as it says on the label - I would not say, rather, it is somewhere around 400-450W ... The company is "Echostar", nice "golden" cover even the quite heavy, with two fans. The interior is very simple - on the secondary side of a single LL(TL)494 and 10 TO-92 transistors plus TL431... Anyway, what happens: after applying voltage to 220V power, the computer starts up immediately, and works normally. Power supply tester shows 590ms PG and it blinks and beeps... Power good signal is 0V... Suspicious electrolytes are replaced, and replaced TL494 too... I have no idea what it might be ...?

[c_hegge]

Re: Echostar 680W power good 0V

Are all the other voltages in spec?

Also, do you have any other pictures of its internals? Ideally, one from the top down, and another of the solder side of the PCB. This will allow us to get a better idea of exactly what kind of circuit we are dealing with.

[Th3_uN1Qu3]

Re: Echostar 680W power good 0V

TL494 has nothing to do with power good signal. If it doesn't have a LM393 or LM339 then it must be generated by some of those TO-92 transistors. Test them, or just replace them all and call it a day, as you can pull them from any dead cheap PSU.

[miligor]

Re: Echostar 680W power good 0V

Are all the other voltages in spec?

Also, do you have any other pictures of its internals? Ideally, one from the top down, and another of the solder side of the PCB. This will allow us to get a better idea of exactly what kind of circuit we are dealing with.

Voltages:
5.13V
3.37V
12.03V
Pictures:

[senz_90]

Re: Echostar 680W power good 0V

I guess this PSU not for 220V mains, 200V primary caps? But surprisely you have voltages, except PG voltage. That Gold Shiny Case is Beautiful !!

[ratdude747]

Re: Echostar 680W power good 0V

I don't mean to be rude... but it's an echo star... one of the most "gutless" brands. There's a thread around here by Kc8adu about a particular "480W" echo star PSU that was so gutless they put lead dummy weights in it to make it feel better built.

I'm all for experimentation but keep in mind that you'd probably have to redo 80% of the PSU to make it decent...

[Pentium4]

Re: Echostar 680W power good 0V

I don't mean to be rude... but it's an echo star... one of the most "gutless" brands. There's a thread around here by Kc8adu about a particular "480W" echo star PSU that was so gutless they put lead dummy weights in it to make it feel better built.

I'm all for experimentation but keep in mind that you'd probably have to redo 80% of the PSU to make it decent...

That was a Powmax though, this looks like a different OEM, and much better built.

Like Th3_uN1Qu3 said, test the switchers. Also, I would replace all the caps on the 5VSB, the two next to the switchers, and see if it works. And look for bad/cold solder joints.

[c_hegge]

Re: Echostar 680W power good 0V

I guess this PSU not for 220V mains, 200V primary caps? But surprisely you have voltages, except PG voltage. That Gold Shiny Case is Beautiful !!

Whaaaaat? They are connected in series on 220/230V mains, so the maximum voltage is 400V. It's extremely rare to see primary caps rated for more than 200V, even in countries with 230V mains.

[miligor]

Re: Echostar 680W power good 0V

I guess this PSU not for 220V mains, 200V primary caps? But surprisely you have voltages, except PG voltage. That Gold Shiny Case is Beautiful !!

One more picture... Yes, it is for 220V, why not? 2 caps with 200V in serial connection...

[c_hegge]

Re: Echostar 680W power good 0V

It looks good with that gold case. I wouldn't give it 400W, though. I doubt it would manage much more than 250W before blowing the switchers.

[miligor]

Re: Echostar 680W power good 0V

All caps replaced, and that's it! Power good 5V and 390ms. Obviously, my esr-meter not working well...

[senz_90]

Re: Echostar 680W power good 0V

forget my reply. I just wake up very late and makes a ridiculous reply yesterday. I am just realized after read it again. LOL I am forget that ATX have 2 series primary caps.
Yesterday I am just try to fix my friend TV and think the smps on TV same as ATX.

[miligor]

Re: Echostar 680W power good 0V

[miligor]

Re: Echostar 680W power good 0V

It's almost indentical to this scheme:

[Escort Eagle]

Re: Echostar 680W power good 0V

Is your Problem solved or not miligor ??

[miligor]

Re: Echostar 680W power good 0V

No, not yet. Power good is now 5V and 390ms, but the computer still starts immediately after connecting 220V power.

[Escort Eagle]

Re: Echostar 680W power good 0V

When you Shut down the PC from Windows, then PSU remains Off ?

I got a such kind of PSU which starts immediately after Plugging in . It is such kind of design .

[ben7]

Re: Echostar 680W power good 0V

^EscortEagle, some motherboards are like that. They will power on as soon as they get 5V stby. It isn't the PSU, it is the motherboard that tells the PSU to turn on.

Uh ... are those 85 degrees C rated 'SWCON' caps?! Those are TRASH! Let alone 85C!

[miligor]

Re: Echostar 680W power good 0V

Finally! One of the C945 transistors was slightly defected, and I could not determine until I pulled out from pcb... Now the computer is waiting till I press Power_on button...
Thanks for help, and sorry for my bad english...