Re: Dell 3008wfp faulty power supply
I'd agree with either programmed obsolescence, or just plain bad thermal design. There is negligible airflow over the metal back cover that acts as the ultimate heatsink. The U3011 has a slightly better grill arrangement, and runs much cooler.
Colin...
Jetset
Member
Last Activity: 04-26-2012, 04:24 AM
Joined: 03-14-2012
Location: Yeovil, Somerset
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Re: Dell 3008wfp faulty power supply
Total loss of power. The screen just went blank during use and the blue power light went off.
Fortunately, this forum and thread has given me the solution, replacing D22 on the PSU board.
I'm wondering if this is a reverse voltage or thermal degradation problem as the monitor worked fine for just over 3 years, albeit it ran much hotter than the replacement U3011.
I've ordered a couple of heatsinks to try (will mean cutting a 100mm square hole in the back plastic/metal cover and having...Leave a comment:
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Re: Dell 3008wfp faulty power supply
Ummm.... This board doesn't seem to allow that if subsequent posts have been made. The edit button only seems to appear if mine is the most recent post....Leave a comment:
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Re: Dell 3008wfp faulty power supply
Doesn't appear I can update the post with the original pictures in, so here they are.
The first shows the points that have to be desoldered to remove the top heatsink plate.
The second show the position of D22.
Colin...Leave a comment:
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Re: Dell 3008wfp faulty power supply
Vogelkun,
I just fixed mine using a STPS40170CT device (40A and 170V reverse rating). As you're in Europe, you could purchase from RS Components (rswww.com)as I did. Part number is 624-7586.
A couple of notes for everyone repairing this particular monitor:-
1) It's actually the BACK plastic cover that you need to seperate from the front, although you'll have to slightly move the front bezel forward as the actual monitor (made by LG) is held in the rear cover by some plastic clips. There is less than...Leave a comment:
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Re: Dell 3008wfp faulty power supply
When re-assembled, the two heatsinks are fixed to the external metal rear housing which totally encloses the PSU and logic board of the monitor, the secondary side using thermal compound, the primary using heat conductive pads. I'm sure the design intends that heat is dissipated by vertical airflow over the vertical rear housing as there are metal grills top and bottom of the enclosing plastic case.
I will remove however much of the secondary heatsink as needed to replace D22 and post another picture. Even that seems to need 2...Leave a comment:
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Re: Dell 3008wfp faulty power supply
Images of back and top of Dell 3008WFP SMPS attached. I've had to resixe them to a size allowed by this site. I can take a 22Mp image if needed using my 5DMKII, but it would be 5-6Mb.
I'll upload another picture of the area of the board under the secondary side heatsink after I've removed it. I don't think I can get at the mounting screws of two other devices to undo them, so will have to desolder those as well to get the top heatsink plate off.
Colin...Leave a comment:
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Re: Dell 3008wfp faulty power supply
I will certainly do that, but it'll be the weekend before I can do it.Leave a comment:
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Re: Dell 3008wfp faulty power supply
Ahhh...Yes, I can just about read the silk screen using a bench magnifier. The component is definitely D22!
One other question if I may: Do you know if this diode blowing is likely go have damaged anything further down the 14V line (I can't see any fuse or fusible link that would normally be present in a SMPS to protect against such failure, and I'm using the old mains plug from the UPS to power the new 3011, so nothing has blown externally)?
Thanks for your response.
ColinLeave a comment:
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Re: Dell 3008wfp faulty power supply
Hi Guys. I'm new to this board having just found it, after having just had my Dell 3008 monitor fail 3 months outside it's 3 year warranty
I'm pretty certain my PSU has the same problem described here, and I've already bought some much higher rated diodes (STPS40170CT) to fix it. No-one's posted an image showing the D22 diode location (it isn't marked on my board), so I'm posting an attached image of where MY faulty diode is located and wonder if someone could confirm that this is the infamous D22 on the 14V rail?
...Leave a comment:
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