Sir jeffshead . . . . .
Well now . . .aren't you one well motivated, electro-mechanically inclined, actual DOER with the unit now being fully exposed and ready for analysis.
Seems like the initial suspicioned board, as being compared to this used boards layout, has its parts being altered around in their placement.
With your separate little AC line input board , having all of its fusing and
Electro Magnetic Interference -
Radio Frequency Interference -
Additional Crap type of supression circuitry, all lined up vertically at the left side and running up and outputting at the
RED WHITE wired 2 pin connector as its top connection.
This initial board has a two way operation, in its supression of the unwanted coming in from the AC line and keeping any internally generated interference from getting fed back into the AC line.
I have the newer pic of the actual board initially marked up in case later referencing to parts need to be made to it.
I can imagine that the larger right side of the board power transformer [ K ] is creating a HEFTY 24 volt supply with the power diodes mounted on [ M ] and the cluster of all shunting [ N ] E-capacitors and then their output routes up to the boards top
LEFT corners 12 or so pins connector that feeds the LCD backlight driver board hidden behind the left sides metal shield.
Sooooooooo . . . I really don't see there being enough E-caps on the actual PS board to account for all of the units sub supplies involved .
So I rea l l l l l y think that those supplies origins on this board are being routed down via the boards top
RIGHT hand corner connector and down to the main pcb.
There you see an inset that I have placed on the end of the photo reference; where you see at least 4 supplies [ O ] toroidal filter inductors and associated E- capacitor clusters being around them. I am seeing 2 major E-caps 10 minor ones and 2- 4 smaller sub ones.
ALSO . . . . being covered in my photo in the mid inset . . . . I can now additionally see that on the MAIN board are 2 or more possibilities.
I now point them out physically, as item [
1 ] appearing to be a linear regulator and it has input and output E-capacitors surrounding it.
To the right is a complete stand alone switching regulator item [
2 ] with its RED ringing inductor and associated E-caps surrounding it.
Check out all of the E-caps cans within all of these mentioned locations and just HOPE that merely one . . . or more might show a degreee of upward doming of its top of can.
Secondarily let the unit run for multiple hours of run time . . . . . . either bad or good display condition, basically, you're just wanting to warm up the set.
Do index fingers tests to two tops of caps at a time to see if you find warm ones, failing units run a bit on the warm side, on their temperature. . . . on up to . . . . . "
EWWWW ! . . . . .thats
hot !
(Or should you be so blessed as to already own a laser based thermal spot temperature thermometer . . .or can borrow one from someone.)
You say . . .
Just to be clear, the panel is not completely blank, the power button always works & turns green & stays on when pushed so it doesn't appear to be the same issue that so many others have reported on different forums.
Right . . . . . so now our consideration is being the PROBABILITY of the unit displaying that highly abberated type of graphics display.
And . . TRUE . . . that you did not find that . . . . "HOLE, dead center in the forehead, for certain clue . . . . . like others encounter in their finding of a canned electrolytic cap with its top outwardly domed to the extent that the weakening X crossing depressions in the can have fractured. That then lets developed gas pressure out and detrimentally, starts a decline in letting the decreased internal damp electrolyte totally dry out, from its newly opened exposure to the atmosphere..
BUT now, what are the chances that if you turn on the unit, from a totally cold start up , that the corrupted display will appear?
AND if it does appear in its abberated state, is there any chance that after 15-30 minutes of run time, that its thermal effect might cause the screen to instantly " pop " into a good display, on its own ?
On the other hand, I suspicion that if you initially turn on the unit and it gives a good display, with continuing run time and warm up, that the display would HOLD with a good display, and be totally fault free for 3 - 6 - 9 - 12 hours.
All in all, I am wondering what are the chances of the display coming on with an abberated graphics condition . . . . so that we can evaluate parts, with it staying in that condition.
Waiting for those findings and I might need help in your inspecting some parts for their part number ID's.
PHOTO SNIPPET REFERENCING . . . . .
https://i.postimg.cc/Z4JtFszY/DELL-2408-s-Power-Supply.png
73's de Edd . . . . .
FULL NAME . . . . . . what a mother calls her child when she's hopping mad at him / her. . . . . . and, usually its a boy.