Dell 2007FPB teardown

[Yugga]

Hi, thank you for this thread. I successfully fixed my Dell 2007FPB with a 2,2K resistor taken from a graphic card. It works so far but I have not tested it during a long time so I do not know if this reparation will last.

[expertpc]

The 2.7K resistor on the bottom is testing good on my unit but there is a 15k marked 153 that is open. So be sure to test the rest!

[DeFi]

Thank you very much for this informative teardown! Thanks to this I was able to fix my friends 2007WPb. The cause was an defective 47K smd resistor at R52 under the white thermal glue on the USB board.

[DeFi]

Thank you very much for this informative teardown! Thanks to this I was able to fix my friends 2007WPb with the "no power at all" symptom. The cause was an defective 47K smd resistor at R52 under the white thermal glue on the USB board.

[tempvoid]

Hey, guys!

Thanks for "272" resistor hint.
Dell 2007FP (2008 year) didn't turn on since few days ago. Now works as new!
Official Dell service in Kyiv, Ukraine: won't fix (read as "go buy newer one").

ac21 and others
http://www.badcaps.net/forum/showpos...3&postcount=12

[paddlestroke]

Hello,

I have one of these LCD and it does not turn on.

Reading through those pages I tried to find the error, but no luck so far.

I looked for exploded caps on all boards but nothing obvious. Then I focused on the USB board as all errors on this topic seems to come from there.

I tested the resistors under the white bulb, but none is deffective. 3A fuse is not blown. Zener I am not sure how to test them. When I use diode on my multimeter I read 0.160 and all paralleles pairs of diodes read the same.

I wanted to test voltage output without having the 220V plugged in so I used my laboratory powersupply and tried to apply 19V directly on the board input (before the fuse) in order to check 5V and 3.V

Something quite strange happens:
- first time I did it there had been a shortcut appeared between 19V and GND, so my laboratory powersupply voltage droped. I unconnected. Then I could still measure the shortcut between ground and 19V. Few minutes after the shortcut was gone.

- second (and other) time I plug in 19V when my 19V electrod come close there is a strong spark, but after the spark it seems normal. The voltage do not drop as first time. And I do not have a shortcut between 19V and GND anymore...
But on all converter bucks Q6 Q9 and Q14 I read 19V both on the input and the output



Should'nt I be reading 5V 3V and 12V on the converter output?
I am not very good yet with debugging electronics so maybe I'm missing something big! Please let me know if this gives you any idea.

[paddlestroke]

After re-trying, it appeared that those strange problems were induce because I applied ground on the screw hole. When applying GND on the pin header (pins 5-6 from left) they disapeared.

Then I could see the problem : only 5V was working, 3.3V and 12V are off.

In the end I found the problem it was 3 SMD resistors that were out of specs (153, 010 and 473) in the row of SMD under the white dielectric blob. Just upside the right PWM IC on my picture.
I found out comparing the resistances values read with ohm-meter between the 3.3V PWM circuit (that was not working) with the 5V PWM circuit (working).
- 153 (15k) and 010 (10k) were clearly open circuit
- 753 and 473 did not read the same values between 5V PWM and 3.3V PWM.
So I unsoldered all that were not the same as on the 5V to check them. Result was 753 was ok (75k), 153 010 and 473 were open-circuit. (473 should be 47k ohm)

I replaced them with new SMD resistor and the 3.3V came back.

I did not fix the 12V as I don't need it. Although I tried but I saw no differences in the SMD resistors of the PWM (with 5V PWM) so I did not knew what else to do.

Hope this might help someone sometime

[dftntm]

Originally Posted by ac21

I had a 2007wpb that wouldn't turn on at all unless i let it sit plugged in for a few hours..then it would turn on long enough for the "no signal message to come on" then die again it would repeat this randomly.

After reading kalmara's post i checked the row of resisters under the "white blob of dielectric" on the usb board .. the first one is a 2.7k (printed on it 272) i first jumped a resister of unknown value across it and the monitor started working. then i desoldered the SMD and soldered in a regular 2.2k resister and put it back together ..everything is working great so far.

I read a bunch of post here and there but couldn't figure it out so i made this post so people in the same situation can do the same but maybe you should replace it with the right resister

here are some pictures of the location on the resister thanks to budm.

[IMG]http://imagizer.**************/v2/800x600q90/716/qgga.jpg[/IMG]
[IMG]http://imagizer.**************/v2/800x600q90/12/tp0c.jpg[/IMG]

Thank you very much. Here it is how I solved, following your advise, the not working monitor issue:

[Behemot]

Kinda big one, no?

[dftntm]

Originally Posted by Behemot

Kinda big one, no?

Yeah

It is a 1 watt resistor. Now I am quite confident that the monitor will become obsolete before that resistor burns open any more.

[Behemot]

I got another piece of this display and unlike the previous two (or was it three?), I do not think this one ever saw the sound bar. However, there was no +12 V anyway. Is it actually supposed to be on all the time, or is it activated only when the bar is plugged in??

[ffejrxx]

i was just given one of these that was said to be bad

works fine using dvi-d, might be vga/composite/svid or usb issue
or it was not bad

anyhoo, cant complain about a free monitor, 1600x1200 res is great cad and photoshop

[elsayed]

Good

[elsayed]

Originally Posted by elsayed

Good

Hello,

I have one of these LCD and it does not turn on.

[asdhsh2006]

hi all i need manual for Dell 2007fpb

[asdhsh2006]

Hi All i need the Schematic diagram manual for dell 2007fpb

[elsayed]

I want help from experts
You need the values of the elements below the white matter in the image
I have learned a lot from you. I thank you all

[budm]

Originally Posted by elsayed

I want help from experts
You need the values of the elements below the white matter in the image
I have learned a lot from you. I thank you all

See post #58 if that is the resistor you are asking about:
https://www.badcaps.net/forum/showpo...0&postcount=58

2700 Ohms.

[elsayed]

Originally Posted by budm

See post #58 if that is the resistor you are asking about:
https://www.badcaps.net/forum/showpo...0&postcount=58

2700 Ohms.

I need the values of these electronic elements in the picture

[Behemot]

It's written on them, http://www.resistorguide.com/resistor-smd-code/

The first two are 2700 and, uh, 75k?