Dell 2408WFPb / 2408WFP - No Power

[shumer]

Re: Dell 2408WFPb / 2408WFP - No Power

Thanks everyone! this forum is the best! After reading all 5 pages, I fixed my monitor!

[sam_sam_sam]

Re: Dell 2408WFPb / 2408WFP - No Power

I bought another 2408WFPb with a working power supply, put the two power supply boards side-by-side, focused some resistance checks on the feedback/isolator area and found differences associated w/ IC701. Out of circuit, the KA431 shunt regulator did not behave right per simple VOM checks. Swapped in a replacement KA431, and voila!

Yea I know I am responding to a very old post but when I read this I had to respond to the comment

I have used this method before but I recently saw a YouTube video where this woman use the diode test on a multi meter and it does a better job according to her but I have not tried this yet my self but I am going to try it when I have something to troubleshoot again that I have more than one of the exact same units

[ddfix]

Re: Dell 2408WFPb / 2408WFP - No Power

My ±13 year old dell suffers the same problem - power on and lights up but just white blank screen with limited menu button control. Guess that's pretty common issue with these dell 2408 monitors...Thank you all for the tips and fixes.

[NEO_Gai]

Re: Dell 2408WFPb / 2408WFP - No Power

My 2408 seems to have issues with overheating. Its been running fine, but now that summer weather is kicking in, it seems like it gets too hot and then shuts off.

I'm assuming its heat, because with a temperature gun aimed at the front of the screen immediately after it blanks out, it's reading about 108 at the top-center.

The power LED stays green, but the screen goes completely blank. I can try unplugging and plugging it back in, but results differ. Sometimes the power LED flickers on as I plug it in, but then stays off. Other times, the power LED turns on, but still a blank screen.

If I let it cool down while unplugged, it seems to power back on again.

I'm not electronically inclined, trying to learn though.

[pylorak]

Re: Dell 2408WFPb / 2408WFP - No Power

Just this week I had the same problem like some users in the beginning of the thread: My Dell 2408WFP could not turn on, the power LED was slowly blinking. Looked like a restart loop. When disassembled, I too noticed the PSU board clicking, the sound coming from somewhere near the right side of the board.

All caps looked good to the naked eye (no bulging, no discoloration, no corrosion or any other noticeable irregularity). So first I replaced only the AK431AZ, but after that the issue was still present. Then I replaced C606 and C611, as well as the large 120uF cap. The monitor is now working without a hiccup

Big thanks to this forum and its users!

[Thermaltake]

Hi, have same monitor it was working normally until I open it to clean with brush, nothing special and it was a bit dusty from inside. No bad caps or any burns, and when I assemble it it won't turn On at all, no green light no anything...Not sure if problem is in flex cable that connects front buttons or something else...Don't have multimeter to measure.

[Thermaltake]

EDIT:

Now when I was looking on the downside of caps I found that on PSU section one cap leaked, could only that cap be the cause of monitor not to power on ?

[nabla666]

Yes, it could be.
The capacitor costs nearly nothing ( 5 for 1 € )
You should try to change it ( or make it done by someone who could

[Thermaltake]

I will replace them all, I already ordered rubycon/nichicon low esr caps, don't know why they didn't put low esr on power supply... That leaked one is lelon they are reeealy garbage caps just like capxon, and hopefully after recap it will work. I really didn't expect dead monitor after just going with brush a little to clean dust of everything (monitor was never opened) I didn't even disconnect any of boards or anything like that and when I assemble it completely dead. First I was thinking of that flex cable for buttons, but it's not garbage and can't damage just like that I was really carefully when I disassemble the monitor didn't stretch anything or force anything. So my only suspect was that cap and one that is near I think same values, it got funny color just like this one but it didn't leak.

[Thermaltake]

Monitor fixed. It was caps on PSU, I replaced them all with quality ones rubycon/nichicon, and one mosfet died probably because of one really dead(burned) capacitor.

[Aezakmi]

Hi,

I have similar problem that I descripted here..

Shortly: power led is green, backlight is working but screen is blank with no OSD.
Today I heated up the two heatsink with hairdryer, plug the cord, pres.s power button and something appeard on the screen. More like some artifacts, but when I pressed input button, blue rectangle from OSD showed up in the corner. It was without port icon and port name.

I consider to buy hot air station to reheat these two chips.

Do you think is this issue still worth of affort?

[Thermaltake]

Hmm, not similar at all, mine wasn't turning On at all. And I noticed on the bottom of the caps(few of them) they leaked, when looking from the top they all look fine.


Is it just mine 2408W monitor that is extremely hot on the top of when it's on for like 2-3 hours or that's normal ?

[luke9511]

hey everyone, is there any place to get a cap kit for the dell 2408wfpb?