Dell E248WFP power cycling off/on

[dumpystig]

Re: Dell E248WFP power cycling off/on

Update:

After going well for several days yesterday the sod started exhibiting the same fault again.

I've just replaced 3 elect's on the inverter board, running it now to see how things go - 45 mins so far. If it still faults then I have 9 elect's that I will replace on the Signal board.

One thing I noticed yesterday is that 2 of the CCFL's look dimmer than the other 4 - this is where the light can be seen showing through the mounting brackets on the back of the panel where the wires enter. So it could also be a prob with the lamps, but the easiest/cheapest route if it faults again is to do the 9 caps replacement. I'm hoping (praying) that I can sort this monitor, it's going to be one of my sons presents for Christmas to use with a desktop I've set up for him.

[dumpystig]

Re: Dell E248WFP power cycling off/on

Re-capped both PSU and Logic boards - no difference.

Replaced Logic board - sorted.

[MarkRamey]

Re: Dell E248WFP power cycling off/on

Hi dumpystig, where did you get the logic board for this monitor? I have the same issue and expect I may need to do some replacement, too. I'm not there yet, but...

thanks

[dumpystig]

Re: Dell E248WFP power cycling off/on

eBay - a seller in Canada. I didn't come across a single one anywhere else after tons of searching. Here's a link to the same board up for sale right now -

http://cgi.ebay.co.uk/ws/eBayISAPI.d...m=250976810046

He's a genuine guy, and I was the only bidder so got it at that price, took about 10 days but I ordered it during the holidays.

After a lot of testing and cap replacements on the PSU and Logic boards I finally took an educated guess and put the fault down to a more complex problem with the Logic board, hence me taking a punt on another one. For me it paid off.

Good luck.

[dumpystig]

Re: Dell E248WFP power cycling off/on

If you detail exactly what happens with your monitor after you press the Power button I can let you know if it's behaving the same as mine was. It may help to give you a more definite pointer to it being the Logic board.

[MarkRamey]

Re: Dell E248WFP power cycling off/on

Thanks for the parts lead. I've been looking on ebay for a cheap beat-up used one that I can strip for parts.

Mine acts the same as yours. It normally comes on and works a while then starts powering off (no lights whatsoever) and on. I resoldered most of the through-hole points that were mostly caps but no change. The surface-mount components look pretty small on the main board. I'm afraid I might fry something with the soldering iron...

No doubt, it is getting worse. It's one of a triple monitor setup but it's unusable now. I don't want to go back to a different monitor that I have that's not matching the y=1200 px (mine's a 2007WFp but the guts look the same). I guess at this point there's not harm in trying to resolder those tiny little smt parts that I can hardly see. ;-) At least I know how to get it apart now :-)

Thanks again,

Mark

[MarkRamey]

Re: Dell E248WFP power cycling off/on

correction... I should have said mine is a 2007FPB, not 'W'...
The guts look the same without comparing the part numbers.

[dumpystig]

Re: Dell E248WFP power cycling off/on

The seller lists the numbers for the board, just compare with yours and see if they match.
I also copied his pic and then zoomed in a little, just to do a quick visual comparison.

[MarkRamey]

Re: Dell E248WFP power cycling off/on

thanks dumpy