Dell 2007WFP Constant On/Off

[remaker]

Re: Dell 2007WFP Constant On/Off

This was EXACTLY my problem. My 2.7k resistor was actually showing wandering resistance when measured - it kept changing!

I unsoldered it and tore the pad. I then traced the pcb traces and connected the resistor (only 2.2k) to the transistor and IC directly for better mechanical strength.

I tore off some of the excess heat sink tape between the power supply and chassis to add back in some thermal mass for those resistors to replace the removed glue.

So far, so good. I would have NEVER found that failed resistor. Thank you, everyone!

[BustinCaps]

Re: Dell 2007WFP Constant On/Off

I fixed my 2007 WFP monitor by replacing the 2nd from the top resistor under the white silicon. It was a 10K resistor (01C) that was blown. Anyone having problems with this monitor should check all resistors and caps under the white silicon. Any one of them could be bad.

[raddocki]

Re: Dell 2007WFP Constant On/Off

My monitor is having the same issue. while trying to replace chip resistor I messed up the board. Can I just remove the board all together from monitor as I dont use USB port anyways?.

I did it exactly!

[KpaL]

Re: Dell 2007WFP Constant On/Off

My dell works again!! Removed that broken smd resistor. Didn’t have 2,7k resistor so now there is 1.2k and 1.5k trough hole resistors in series.

Used some hot glue to secure those resistors in place.

[atewari5]

Re: Dell 2007WFP Constant On/Off

My monitor is having the same issue. while trying to replace chip resistor I messed up the board. Can I just remove the board all together from monitor as I dont use USB port anyways?.

[theplop]

Re: Dell 2007WFP Constant On/Off

I've the same issue one, and fixed by myself.

1. I've remove all glue circled in the picture.
2. replace the chip resister code 272 (2.7K, 0603, arrow pointed).

hope this reply could help.

ps. original pictures are from this thread => https://www.badcaps.net/forum/showthread.php?t=10658

I had the same issue as others in the thread, monitor would turn off and on randomly. I assumed it was a capacitor. I replaced the resistor as suggested in this thread, and it has been working like a champ since!
So, thanks guys!

Pics attached.

[Ghesil]

Re: Dell 2007WFP Constant On/Off

Thanks.

It worked for me as well it seems.

I didn't have an SMD resistor so i kludged a normal 1/4 watt trough hole instead then fixed it with hot snort.

[marce002]

Re: Dell 2007WFP Constant On/Off

Make a blob of solder over all the resistor.
If you don't have flux it's time to have some. It will last for lifetime.

Over the ofending 272 resistor only? Or over the whole set of resistors in thar area covered by that white glue?

[Tupp]

Re: Dell 2007WFP Constant On/Off

Hi, I have the same problem. I scraped off the white glue, and when I tested the 272 resistor with my multimeter, it either fails to get a reading, or shows about 16K I don't have a soldering iron at my house so I can't really take it off, and it is super small so I'm not sure if I could even put it back on.

Do I need to replace the resistor?

[Lonewolfee1]

Re: Dell 2007WFP Constant On/Off

Is it spare resistor or resistor that you measured with it still connected to the board?
You have to remove it and measure it off the board since it is connected to other circuits on the board.

I removed it from board and it tests 2.65K so I don't think it is the problem. Grrrrrr

[budm]

Re: Dell 2007WFP Constant On/Off

Is it spare resistor or resistor that you measured with it still connected to the board?
You have to remove it and measure it off the board since it is connected to other circuits on the board.

[Lonewolfee1]

Re: Dell 2007WFP Constant On/Off

Hi Guys. Thanks. I do have all the tools as I replace caps alot on monitors. I just have never replaced a chip resistor. Watched some videos on youtube and it looks easy enough.
I do have another question though. On one of the 272 resistors I am only getting a reading of 1.97K or so, I assume that this is out of range and still faulty?

[Dumah Brazorf]

Re: Dell 2007WFP Constant On/Off

Make a blob of solder over all the resistor.
If you don't have flux it's time to have some. It will last for lifetime.

[budm]

Re: Dell 2007WFP Constant On/Off

What kind of tools do you have for soldering works? If you do have have to the tools then find repair shop that do component level repair to have them remove and install the new resistor.

[Lonewolfee1]

Re: Dell 2007WFP Constant On/Off

Hi Guys. I have 2 wfpb monitors like this. Just pulled them apart and yes the chip resistors are bad. My question is this: Can someone post pictures of how they fixed it? I'm having a hard time figuring out how to get the chip resistor off the board. Any help would be appreciated.

[Shadow Lord]

Re: Dell 2007WFP Constant On/Off

Seems like it worked for my 2007FPB too. No problems since 2 days. Thank you very much!

My 2007FPB just begun displaying the same symptoms. I was wondering di you do a cap replacement as well as resistor replacement or did you go straight to the resistor? I have the caps but mine look nice and tight (no bulging or leaking). I hate to mess with a good board if the problem is completely elsewhere.

TIA!

[mariozankl]

Re: Dell 2007WFP Constant On/Off

Seems like it worked for my 2007FPB too. No problems since 2 days. Thank you very much!

[tmacchiaroli]

Re: Dell 2007WFP Constant On/Off

Hi guise, I wanted to thank you, my monitor had the same problem it would turn on and off.
It ended up being the 2700 ohm resistor. Just for clarity this is the last resister in the row under the white goop.
I did have a bit of frustration because I didn’t realize that there were two pages to the Thread, so I thought the fix to the problem was reflowing the section of the power supply board on the first page.
I found out this didn’t solve the problem after I reflowed my board.
There are a quite a bit of people on the forum who have the same problem but never found this solution.
With all that I would have never found the problem without your help.

HOW DID YOU FIND THE PROBLEM IN THE FIRST PLACE?
DOES ANYONE KNOW WHERE TO CET SCHEMATICS OF THE MONITOR?
Thanks Tony

[dev5994]

Re: Dell 2007WFP Constant On/Off

I replaced the resistor mentioned by POM_MJ, and my monitor works perfectly now! I used a 2.7k 5% 1/4W through hole resistor as I didn't have the SMD replacement. Works great!

[DrDragon]

Re: Dell 2007WFP Constant On/Off

Thanks POM_MJ, replacing the 272 603 resistor solved the power cycling on my 2007WFP. I was a little worried when I checked the Caps an couldn't find one that was bad that she was headed for the grave yard, but then I found your post!
Thanks Again!