Power suply doesn't work (DPS-214CP)

[budm]

Re: Power suply doesn't work (DPS-214CP)

Can you verify that the OPTO PC901 is OK?
The Brown out protection IC 902 can be left out for now, the output of that IC will go low if the AC brown out is detected.
I believe the SMPS IC is in the open loop protection mode.

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

Yes, at least it's not shorted. But when I arrive home I could desolder it and make a circuit to check it's behaviour
In case of a faulty OPTO souldn't the drain pin starts swiching and stops suddenly after a little bit time?

[CapLeaker]

Re: Power suply doesn't work (DPS-214CP)

Like budm, for me IC901 is in latched off / over voltage / shorted winding protection mode or the replacement PWM is bad again. Then it will do the ramping up down triangle thingy then too.

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

Ok, I have checked the OPTO, it works OK.

[CapLeaker]

Re: Power suply doesn't work (DPS-214CP)

Can you make a list on which components you have tested so far?

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

At first I supoussed that there was an issue in primary so I cheked every compoment surrounding DDA010 (resistors capacitors diodes an even the transistor) then I checked there wasn't no shorts at secondary that can stop DDA010 from switching. After that I replaced DDA010, but nothing changed and then I came here and I followed al your recomendations.

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

So, to sumarize, I have cheked: D901, D903, D902, Q901(not shorted), ZD901, ZD902 and ZD906 (not shorted), ZD903 (behaviour checked), PC901, D950, R905, R915, R914, R902, R901.

[CapLeaker]

Re: Power suply doesn't work (DPS-214CP)

what about the transformer itself, R903 and C905?

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

R903 is ok, C905 replaced and nothing changed.
The transformer values are:
Pins 7-5: 0.8 Ohm
Pins 9-10: 0.5 ohm
Pins 1,2 - 3,4: 0.1 Ohm

[CapLeaker]

Re: Power suply doesn't work (DPS-214CP)

what disturbs me is that the PWM isn't even trying to switch on the Drain pin. Maybe verify this again. Because if it isn't at all, I think that the PWM is bad, even tough you put a new one in.

[dskall]

Re: Power suply doesn't work (DPS-214CP)

I am not good with spec sheets but it looks to me that 5v on feedback will shut down DDA010

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

Hello again, good news, or maybe not. Y have checked again, and as I said when I plug in the power supply I can't see nothing in the scope related to the Drain pin... but I really have 5 volts in +5V in the secondary side for arround half a second.

I'm still confused, I hope this new info helps.

Thank you one more time for all the help and the advice given up until now.

[budm]

Re: Power suply doesn't work (DPS-214CP)

May I ask how you go about testing that OPTO IC?

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

May I ask how you go about testing that OPTO IC?

Already done, as I said in #22 and #24 I checked and it works ok.
Apart fron the fact that it was not shorted I made a external circuit to test it with good results.

[budm]

Re: Power suply doesn't work (DPS-214CP)

Well the reason I ask you because it is obvious that SMPS IC did go active for seconds to produce output on the cold side even though you indicate there is no reaction on the Drain pin of the IC so may be the scope was not set to trigger properly to catch action on the Drain pin, I just want to make sure we get correct data, that's all.

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

Yes, probably I made a mistake with the scope. The IC produce output fir a little time but then it stops and doesn't work.

[CapLeaker]

Re: Power suply doesn't work (DPS-214CP)

What happens if you take L951 out in the secondary and measure the 5V rail directly at the legs of C951A (3300uf 10V), while plugging the PSU in? I am trying to find where the other end of 5V' goes (right after L951)?

[NoN4me]

Re: Power suply doesn't work (DPS-214CP)

Exactly the same, I have 5 volts as I plug it but afterwards the voltage decreases I guess that's because of the capacitors.

[CapLeaker]

Re: Power suply doesn't work (DPS-214CP)

Exactly the same, I have 5 volts as I plug it but afterwards the voltage decreases I guess that's because of the capacitors.

??? The capacitors shouldn't have an effect on that, unless there have a high ESR value. Maybe post some high resolution pictures of your PSU, front and back.

[Lanparty]

Re: Power suply doesn't work (DPS-214CP)

Hello guys I have the same problem but with Delta smps on Grundig ...Ic DDA010 and IN1M101 ...I saw this post and I have to say that all of my elements are ok even I have changed both IC'S but still the same symptoms ..I have two questions to you do you have pulsing on Vcc pin on Ic DDA010 ??
Did you check the capacitor 22pF 1Kv and diodes which are connected to the primary coil of your transformer ?
My st by is only 3,6 V ...You have to tray to diskconnect the jumper between both ic's Vcc jumper then if the tv works and goes into loop IN1M101 is defective ... I have attached a file that may help you finding the problem ...