Dell 3008wfp faulty power supply

[Lumberjack777]

Re: Dell 3008wfp faulty power supply

It's been about 8 months since I first removed that irritating bezel!

I also feel this luck, I very much look forward to this 1600p cheesecake!

8 months eh? That IS a new record. Just kidding.

OK. First of all, don't worry about replacing the D22 schottky diode for 4 reasons.
1. The newer PSU's have a better diode. 2. We remember what happened last time you got into that. 3. You can always use a surge protector. And 4. "If it ain't broke, don't fix it" my Grandpa used to say.

After your friend replaces that capacitor. With the PSU all by itself, and not connected to the main board or the inverter. You'll need to turn over the PSU. Plug it in. And you'll only get one voltage output. The 5 volt standby. I marked the ground and the positive connector pin in the lower left of the picture. That should be 5 volts or above. And steady. No fluctuations. Mine showed 5.2 volts and steady.

All the other voltages will power up later when the main board is connected and sends back the PS_ON (power supply on). But we don't need to worry about that right now.
Just look for that 5V standby voltage on the pin marked in the picture.

[fuus]

Re: Dell 3008wfp faulty power supply

How can I tell if this PSU is a newer model? It's obviously been lying around for a while...
If the D22 is resoldered it will be undertaken by my friend don't you worry!

It may be 9 month even, I'll look back when I get home


Thank you LJ7!

[selldoor]

Re: Dell 3008wfp faulty power supply

May have a date on the board near the manufacturers name or what is the version number on the barcode on the back of the board see pic here
https://www.badcaps.net/forum/showpo...3&postcount=23
Any dates on the caps?

[fuus]

Re: Dell 3008wfp faulty power supply

I'll be home in about an hour, results / findings will be posted then

EDIT: OK, first finding is that the boar doesn't even have a revision number (serial 6723000009P10) so I assume it's an A01

I will test voltages now!

[fuus]

Re: Dell 3008wfp faulty power supply

OK: The pin you labelled LJ7 fluctuates between 7.12 and 7.09 volts

[fuus]

Re: Dell 3008wfp faulty power supply

for comparison the dead board was an A03, and that broke

[selldoor]

Re: Dell 3008wfp faulty power supply

OK: The pin you labelled LJ7 fluctuates between 7.12 and 7.09 volts

Sounds a bit high to me, but may be ok at least its higher - check your meter/battery say on a 1.2/1.5v battery

[fuus]

Re: Dell 3008wfp faulty power supply

Hmm, I tried it against some 3.7v Nokia batteries and they all came out as 5V. I will try a different meter!
EDIT: a 1.5V battery read as 2.2V. Safe to proceed?

[fuus]

Re: Dell 3008wfp faulty power supply

safe?

[selldoor]

Re: Dell 3008wfp faulty power supply

Sorry had to go and make and eat tea.
Yes I think it will be ok - as batterys go in meters some of them read high though they usually have a "low Battery" indicator.

[fuus]

Re: Dell 3008wfp faulty power supply

I'll test it later then! The low battery thing is iffy......

[fuus]

Re: Dell 3008wfp faulty power supply

Dead.

[selldoor]

Re: Dell 3008wfp faulty power supply


what who you? dont panic. Any flash whistle pop with this event.
Get your meter working -your going to need it.

[fuus]

Re: Dell 3008wfp faulty power supply

No whistles no pops! I have disassembled it again and am ready for testing! I would say the dented cap has bulged very slightly. I shall work on replacing that first. If you know anything else obvious to check, please shout it out

Thanks!

[selldoor]

Re: Dell 3008wfp faulty power supply

I think ask your relative to replace that cap then we start with a level playing field

[fuus]

Re: Dell 3008wfp faulty power supply

will do! I'll talk to him tonight

[fuus]

Re: Dell 3008wfp faulty power supply

I've arranged for him to have a look at it and proceed before Wednesday next week

[fuus]

Re: Dell 3008wfp faulty power supply

Being repaired tonight, should hopefully have it back by this weekend

[wobbin]

Re: Dell 3008wfp faulty power supply

Had my eye on one of these on Ebay last night - but it went for over £240 in a non working state (won't power on).... blimey that's nuts !

[fuus]

Re: Dell 3008wfp faulty power supply

I have hopes yet then