PSU iMac G5 17" Delta DPS-180QB

[bajin]

Hi all,
I acquired the iMac G5 17" pre-iSight. It has non-working PSU.Somebody
tried to repair it before and replaced MOSFETs Q1,Q2,Q3 with drawer reservers. He also replaced fuse with a wire (aaargh!). Now, one of the mosfets is blown and thanks to the wired fuse bridge rectifier and NTC also.
I am asking what are the original parts for Q1,Q2 and Q3.
Is there anybody working on the same unit right now ? :-)
PSU is DELTA. Label on PCB says DPS-180QP.
-bajin

[Escort Eagle]

Re: PSU iMac G5 17" Delta DPS-180QB

I have a diagram of Delta DPS-200PB for ATX . But I do not know MAC and ATX PSU are same or not !! If you want, then I can give it to you .

[bajin]

Re: PSU iMac G5 17" Delta DPS-180QB

Thanks, I've found DPS200PB schematic and it is different from 180QB.

[PeteS in CA]

Re: PSU iMac G5 17" Delta DPS-180QB

I have a diagram of Delta DPS-200PB for ATX . But I do not know MAC and ATX PSU are same or not !! If you want, then I can give it to you .

Late 90s and early 00s Mac ATX-style P/Ss lacked -5V, that pin being used for an extra +3.3V wire. And of course, the Mac wire harness is much, much longer (those used in the drop-side type case, at least).

[PeteS in CA]

Re: PSU iMac G5 17" Delta DPS-180QB

You might try contacting the Delta Products offices in Soest, Germany or Dubnica nad Vahom, Slovakia. Maybe one or the other (or both) offices will have some tech support people who might help you.

[bajin]

Re: PSU iMac G5 17" Delta DPS-180QB

Sorry, but I think contacting DELTA is waste of time and effort
I've changed NTC, bridge rectifier and one MOSFET. Now 5V STB power is working, but when jumpered on, series light bulb is lit. It means there's a short somewhere. I've removed both switching mosfets Q1 and Q2 and there is still short somewhere. I have tested all diodes and all appears to be good. Normally I repair SMPS with help of datasheet circuit of PWM controller, but I can't ID the controller in this PSU. I guess it is IC3. I can't ID IC5 also. Also, I don't understand why there are two PFC controllers L6562D and DNA1001. Can you somebody help me ID part IC3 and IC5, please ?

ps. when I remove Q3, which is PFC (L6562D) switching transistor, 5V stby voltage is OK and no short when jumpered on.

[momaka]

Re: PSU iMac G5 17" Delta DPS-180QB

Depending on the wattage of the series bulb, sometimes it may stay lit for 2 to 5 seconds or so, until the main cap charges. This is normal. If the bulb doesn't dim in 10 seconds, turn power OFF. Also make sure nothing is loading the outputs.

[Escort Eagle]

Re: PSU iMac G5 17" Delta DPS-180QB

That means you have a short in the output . This is why Series bulb is lighting . Search the output . It could be Capacitors, Diode or discharging resistors . Specially Capacitor makes such kind of problem most of the time .

[Toasty]

Re: PSU iMac G5 17" Delta DPS-180QB

Q2 = 07N60C3

Q3 = P20NM60FP

I will need to disassemble it to confirm Q1 and get other component's ID's.

It does not have 2 PFC controllers, only one, L6562D. The DNA1001 is likely a supervisory chip that monitors the outputs and gives the Power OK signal to the motherboard.

Standby is produced using the TNY267G.

T

[PeteS in CA]

Re: PSU iMac G5 17" Delta DPS-180QB

Toasty, if the DNA1001 is on the secondary side of the circuit it is a supervisory IC. In the late 90s and early 00s Delta used two custom ICs, the DNA1001 and DNA1002. One, used on the secondary side, was a supervisory circuit. The other, used on the primary side, was a PFC-PWM (UC3854 and UC384x) combo controller.

[Toasty]

Re: PSU iMac G5 17" Delta DPS-180QB

Yup.

The DNA1001 is on the daughterboard at the left end of his topside pic.

If the outputs were shorted or had other issues (OV/UV), the series light bulb would pulse once when the unit was plugged in and go dark, never to illuminate again. The supply is monitoring the outputs and would send a shutdown signal back to the input side if there was trouble on the outputs. Function is very typical of a Delta and would require a disconnect of mains power to reset.

T