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Old 08-19-2013, 04:56 PM   #1
oden08
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Default Dell 3007wfp faulty power supply?

Hello, I recently was given a Dell 3007wfp monitor that doesn't power on. No amber light, no nothing. Did some research and found some very good information for the Dell 3008wfp here - (http://www.badcaps.net/forum/showthread.php?t=14195) and thought it would translate to my monitor. Got it apart and there isn't a corresponding D22 that I can see and no bulging caps.

I was wondering if anyone could point me in the correct direction as anything would be very appreciated.

Attaching a pic of the power supply.
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Old 08-20-2013, 02:23 PM   #2
oden08
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Default Re: Dell 3007wfp faulty power supply?

Anyone have any thoughts? I have noticed some around the WWW that have posted about fixing the 3007 by replacing D22 but can't find D22 - possibly D221?

What strategy do you all use to test the components of busted PS's?

Quote:
Originally Posted by oden08 View Post
Hello, I recently was given a Dell 3007wfp monitor that doesn't power on. No amber light, no nothing. Did some research and found some very good information for the Dell 3008wfp here - (http://www.badcaps.net/forum/showthread.php?t=14195) and thought it would translate to my monitor. Got it apart and there isn't a corresponding D22 that I can see and no bulging caps.

I was wondering if anyone could point me in the correct direction as anything would be very appreciated.

Attaching a pic of the power supply.
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Old 08-21-2013, 05:27 AM   #3
oden08
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Default Re: Dell 3007wfp faulty power supply?

Anyone?
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Old 08-24-2013, 04:56 AM   #4
Gingerbeer
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Default Re: Dell 3007wfp faulty power supply?

There is a fuse on the power board - Mine was buried under a huge glob of hot glue, so look around. Run a continuity test on it, and replace it if needs be. That's all that was wrong with mine, and it's been fine for the last 18 months.

eidt - I can see it right next to your mains input, in that pic.

Last edited by Gingerbeer; 08-24-2013 at 04:58 AM..
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Old 09-01-2013, 12:12 PM   #5
oden08
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Default Re: Dell 3007wfp faulty power supply?

Thanks Gingerbeer, yeah checked the fuse first and it seems ok, tried to check the diodes in circuit but as I understand it you can't check diodes in circuit. About out of ideas.
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Old 09-22-2013, 09:28 AM   #6
slabklab
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Default Re: Dell 3007wfp faulty power supply?

Hi,
I have the same problem pretty much and tried the same approach but got nowhere. The monitor Has been sitting on my bench for a few months now.

Have you made any further progress?
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Old 09-23-2013, 07:27 AM   #7
bigjohn22
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Default Re: Dell 3007wfp faulty power supply?

Your picture is very blurry and it doesn't help.
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Old 10-15-2013, 06:59 AM   #8
vangnet
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Default Re: Dell 3007wfp faulty power supply?

Quote:
Originally Posted by slabklab View Post
Hi,
I have the same problem pretty much and tried the same approach but got nowhere. The monitor Has been sitting on my bench for a few months now.

Have you made any further progress?
Hello, I'm new here, but i have the same problem.
Looking on the board i have found: the 17N80C3 (power transistor) was burned out, the capacitor 101 1Kv was burned. Now i try to buy the transistor.
Cost 6,00.
i am searching for more problems, but biggest problem is time.
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Old 10-15-2013, 10:03 AM   #9
budm
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Default Re: Dell 3007wfp faulty power supply?

Better pictures of both sides of the board will help.
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Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956

Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999

Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl

Tear down pictures : Hit the ">" Show Albums and stories" on the left side
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Old 12-21-2018, 11:07 AM   #10
plumpie
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Default Re: Dell 3007wfp faulty power supply?

My 3007WFP turns off after a few hours, and then when I turn it on again, the time between turning off is in minutes.

This is a different failure mode then what most people here have, so can it still be d22?

To check the caps, I bought a mesr-100 esr meter, it seems to work well on some old caps I have lying around, and the ESR of the caps seems to be good (<0.1 ohms on all, except for c17 which isn't electrolytic but I can't seem to measure the ESR on this one). So it doesn't seem to be the caps.

Should I still buy a new diode for d22? What can can cause the monitor turning off after it's warmed up?
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