Over heat, freezes all buttons on black out after about 30 min. Won't black with it apart (no heat shields on boards or plastic encasing) at least within about 40min ;)
Sounds more like a digital board problem than anything. Dell's OEM for your model is Benq. They made a ton of these units, so it's a trivial task to find replacement parts second hand. If you believe it is heat related, you can use a hair dryer to heat up different parts of the assembly to reproduce the symptom while the unit is apart. Either that or drill some holes in the metal shielding to promote better airflow inside the unit. 
SOURCE: LCD Monitor will not switch input selections
NOTE: You can also lock or unlock the OSD by pushing and holding the Menu button for 15 seconds. In this mode All buttons will be locked including the "Menu" button. You can unlock by pushing and holding the Menu button for 15 seconds.
Reference:
http://support.dell.com/support/edocs/monitors/2005FPW/En/setup.htm#Using%20the%20OSD
SOURCE: Dell LCD E207WFP (Switches on Briefly then goes Off)
two case trouble reason and need to do:
1) back light driver (inverter) works not stable and DC power protect. it near some component damage, should repair inverter by egineer.
2) back light (lamp) over life cycle so protect by the inverter, should change new lamp (regular parts)
3) DC power supply not stable or component over life( wave filter capacitor), should be replaced
SOURCE: My power on/off button (on a Dell Ultrasharp
This is a very common problem, check the great solution for repairing the power button on Youtube:
http://www.youtube.com/watch?v=RXAQxwCTuuI&feature=related
335 views
Usually answered in minutes!
Somehow this format screwed up my question; here it is again: Dell Ultrasharp 2407wfpb 24" widescreen LCD monitor goes black (with the back light on) after a while and then won't allow me to power it off or switch to any other input. After unplugging it and then plugging it back in it will do the same thing after a shorter period of time; indicating that it's an overheating problem of some kind. I took it apart and looked at all the boards with magnifying glass' and can see nothing;( Ran it for about 30 min. with the heat shielding & cover off and it didn't repeat the problem, so I put it all back together. Had it going for about 20 - 25 min. and it goes to the black;( Could not see any caps that were swollen on top; next thought is a cold solder joint, unless there is someone who know their sh__? Please HELP!
×