DELL 2007wfp - 2 Secs to black w/flickering

[Armandorf]

Re: DELL 2007wfp - 2 Secs to black w/flickering

4001Rxxxxxxxx is the type i need? i have wasted so many time, at least i ve learned

[selldoor]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Are you sure it measures as OPEN and not as 0.00. we are only expecting it to be less than 1 ohm so meter should be on ohms20 or less.
What do the primaries on the old one measure
Can you unsolder it again and post pics of the bottom of both the old and new.
align them with the positioning pin at the same end.
I also notice there is some damage to the cap - does it just extend to the outer plastic?

[Armandorf]

Re: DELL 2007wfp - 2 Secs to black w/flickering

yes the damage is only in the cover, i did it when i removed the old transformer that had an open winding, i dont have a good transformer out of the board, but i can desolder one of the other two original transformers.

comparing readings in the board without desoldering:
1st original 0.03ohm
2nd original(middle)0.04ohm
3st new open, infinite resistance

i believe the originals have 0.8ohm in each winding becuase:

middle pins are joined in the board. i suppose that the board is putting the 2 resistances(p1 to p3 and p2 to p4)in paralel, giving half the original resistance value for each winding)

anyway i think i will be desoldering it to check for sure

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

3rd transf

1-8 resistance: 1.040 K
4-5 resistance: 52.3 K(200K scale)

Interesting... I have a 2007wfpb that's doing the same thing. ...and the same transformer is bad. I wonder if there was some sort of error in the design or if this is purely a chance happening?

T801:
1-8:1076Ω
4-5:1089Ω

T802:
1-8:1089Ω
4-5:1095Ω

T803:
1-8:No reading
4-5:1078Ω

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

I have been doing some searching using google and I'm not finding any transformers that mach the 4001r714050 exactly, should this 4001K do the trick? Or is the 15K resistance enough different that it would cause problems?

[selldoor]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Unless your meter is broken there is no such thing as "No Reading".

I think that the 1500 resistance would trigger a shutdown but it may depend on the circuitry - the primary also seems different.

Perhaps update your profile with country and voltage.Someone near you may
have a spare?

[Armandorf]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Im moving my stuff to other place so till tuesday im stuck.

later I will desolder the new transformer

at first I thought that a faulty ccfll overcharged the transformer with that ccfl. but they glow. probably is the inverter only.

finding an inverter board complete can be the solution.

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Unless your meter is broken there is no such thing as "No Reading".

Then I must be doing something wrong... I'll fiddle around with it some more today. Line and locale info updated btw

[tom66]

Re: DELL 2007wfp - 2 Secs to black w/flickering

If your meter reading doesn't change from not having the probes touching, then I would consider that "No Reading".

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Right. My meter's default reading with the probes not touching is "1" on the left side, and nothing changes when I test those pins. I'm assuming that means the connection is open, yes?

[tom66]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Right. My meter's default reading with the probes not touching is "1" on the left side, and nothing changes when I test those pins. I'm assuming that means the connection is open, yes?

Yep... that's open. Try testing on 2M range (or 20M or 200M if your meter has it), but it's definitely failed.

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Yep, not a single reading from 200 to 2000K

[tom66]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Yep, not a single reading from 200 to 2000K

It's dead, Jim!

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Well, now we have two people that need these units. I wish my Google-fu was better for this sort of thing, but I can't find any trace of the 4001R transformers anywhere. ...Of course Google probably ain't the best place to looks for specific electronics components, but I don't know where is.

[retiredcaps]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Well, now we have two people that need these units.

Re 4001R

https://www.badcaps.net/forum/showpo...59&postcount=9

[Mac Nut]

Re: DELL 2007wfp - 2 Secs to black w/flickering

I shall search this man out.

[LAS]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Hi Mac Nut - I will send you a PM.

[LAS]

Re: DELL 2007wfp - 2 Secs to black w/flickering

Mac Nut - is this the one?

[selldoor]

Re: DELL 2007wfp - 2 Secs to black w/flickering

That is the same as Armandorf's board 20$US at shopjimmy.

[LAS]

Re: DELL 2007wfp - 2 Secs to black w/flickering

This is the board that came out of my 2007wfp that had a terminal problem with the video board.