Dell 2007FPb cannot stay on

[gengtian]

I picked up a Dell 2007 FPb from someone else. Its symptom is after power on (press the on/off button), the initial Dell logo animation just shows up for less than half second and then black screen. The power led stay green and with flashlight at 45 degree I can't see any image. After reading a few threads about this monitor, I guess it is somewhere on the inverter board but could find any obvious defect part. So I took pictures for all the four boards and try to see whether expert here can give me some suggestion. Thanks a lot.

[selldoor]

Re: Dell 2007FPb cannot stay on

In the last picture there is a small yellow torpedo fuse - test it. Should be ok as you do get a flash. Next test the secondary windings on the 3 transformers on that same board.

[gengtian]

Re: Dell 2007FPb cannot stay on

Sorry. I was away for a week from my office. I test the resistence of the yellow fuse by multimeter, seems to be OK. How to check the transformer? Should I put the four boards together and plug in? Thanks.

[budm]

Re: Dell 2007FPb cannot stay on

https://www.badcaps.net/forum/showth...fpb#post335335

Check the inverter transformer secondary side resistance.
If you search the '2007fpb', you will get lots of threads.

[gengtian]

Re: Dell 2007FPb cannot stay on

I did checking according to the post:
https://www.badcaps.net/forum/showth...pb+transformer
The resistence between 5 and 6 is out of my multimeter reading range for all the three transformers, between 7 and 8 is something around 9 Milliion om for all three of the them. When I hook up all the four boards together and plug in the the inverter connector in to A,B,C,D separately, I could not see the screen was lit up after turn on the power. How to see the "lamp flash briefly"?
Thanks.

[budm]

Re: Dell 2007FPb cannot stay on

Pin 8 and the bottom pin where the dot is that is one high voltage winding for the left side of the transformer, pin 5 and the bottom right pin is for another winding, it should be around 1000 Ohms.
Same pin out as this one:
http://s807.photobucket.com/user/bud...tml?sort=3&o=2

[gengtian]

Re: Dell 2007FPb cannot stay on

I checked the resistence, all six pairs are about 1060 ohms except the right most (ie the pair for the pin 5 as labelled) is 1389 ohms. Do you think this reading ok?
Thanks.

[retiredcaps]

Re: Dell 2007FPb cannot stay on

I checked the resistence, all six pairs are about 1060 ohms except the right most (ie the pair for the pin 5 as labelled) is 1389 ohms. Do you think this reading ok?

No, it (1389 ohms) is bad. The readings should be within 3% of each other.

[budm]

Re: Dell 2007FPb cannot stay on

2nd that.

[gengtian]

Re: Dell 2007FPb cannot stay on

Thanks for both of you. What "keyword" shall I use to find a replacement on those website such as digikey.com or newark.com? The label on top of them is 1J.26061.001 4001R 613003

[retiredcaps]

Re: Dell 2007FPb cannot stay on

I don't see any replacement parts for a 4001R on ebay or http://lcdparts.net/T.aspx.

[retiredcaps]

Re: Dell 2007FPb cannot stay on

BTW, everything you have described and tested is in the FAQ "2 seconds to black" starting with post #19 (latest revision).

https://www.badcaps.net/forum/showthread.php?t=10419

[retiredcaps]

Re: Dell 2007FPb cannot stay on

I forgot that an USA member might also have the 4001R transformer from a repair gone bad. If you are interested, I can send him an email to see if he still has one and put you two in contact?

[gengtian]

Re: Dell 2007FPb cannot stay on

Thank you very much for your generous offer and very nice helps. I found the inverter board sold on a Chinese ebay site and decided to jump into there. Thanks.

[gengtian]

Re: Dell 2007FPb cannot stay on

Just to update. I finally received the inverter board from the Chinese ebay store and now the monitor works. Thank all you guys very much for the helps.
One more thing, just found on ebay this inverter board is also available now for $20 from a US seller.