Re: Dell E172fpb

dave without looking I would guess you shorted one of your switching transistors when you resoldered your board. or shorted something else.
thats the best I can do, sorry
kevin

Re: Dell E172fpb

Im realy glad this worked out for you, I cant imagine that removing this resistor will have any negitive effects on other parts of the board. My monitor has been working great since the removal and I run it 24/7 sometimes. I dont think a larger resistor will help anything, from what I can tell this is probably a duty cycle controlled circuit and not a current controlled nor is this resistor set up as a voltage divider. so you will likely need an external circuit with variable duty cycle to control the brightness. but I wouldnt be 100% sure untill I got a monitor...

Re: Dell E172fpb

Ok this is my assessment of source of the problem, the source is not in the power board but in the video board. For some reason the adjust out of the video board does not respond to the brightness buttons on the front panel at all. This would be pin one of CN701 to the video board. The video board gives a constant 86% duty cycle and constant frequency out for me and does not change. My guess is this is what is overdriving the transistors. The nice thing is if you remove resister R750 top/right on the power board the panel goes to a default brightness which is plenty...